203 questions — 102 objective (1 mark), 70 short (5 marks), 31 long (10 marks). Every answer is checked against the 2014 BEE guidebook and carries its book section reference plus an explanation. ▶ Practice this chapter interactively (timer, read-aloud, progress saving).
📖 §7.3 Financial Analysis Techniques — Time Value of Money
1. What is the future value of a cash flow at the end of the 6th year, if the Present Value is Rs. 2 Lakhs and the interest rate is 9%?
3,28,540
3,35,420
2,84,980
none of the above
Answer: B) 3,35,420
Confirmed vs Book-1 §7.3 — FV = PV(1+i)^n = 2,00,000 x (1.09)^6. (1.09)^6 = 1.6771, so FV = 2,00,000 x 1.6771 = Rs.3,35,420.
The book's compounding relation is FV = NPV(1+i)^n; options (a) and (c) do not satisfy it at 9% for 6 years.
Source: Sep 2021
📖 §7.3 Financial Analysis Techniques — Return on Investment (ROI)
2. Return on investment (ROI) is ____.
initial investment/annual return
annual cost/capital cost
annual net cash flow/capital cost
none of the above
Answer: C) annual net cash flow/capital cost
Confirmed vs Book-1 §7.3 — Book: ROI = (Annual net cash flow / Capital cost) x 100; as a plain fraction it is annual net cash flow / capital cost.
ROI is the inverse of the simple payback period (Example 7.3: 25,000/1,00,000 = 25%, payback = 4 yr).
Source: Sep 2021
📖 §7.5 Sensitivity and Risk Analysis
3. A sensitivity analysis is carried out for an energy saving project to make an assessment of
cash flows
risks due to assumptions
capital investment
best financing source
Answer: B) risks due to assumptions
Confirmed vs Book-1 §7.5 — Book, Section 7.5: 'Sensitivity analysis is an assessment of risk.' Cash flows rest on assumptions (capital cost, savings, escalation, project life) that carry uncertainty.
It answers 'what if one or more factors are not as favourable as predicted', i.e. it quantifies the risk in the assumptions.
Source: Sep 2021
📖 §7.3 Financial Analysis Techniques — Simple Payback Period
4. A waste heat recovery system costs Rs. 54 lakh and Rs. 2 lakh per year to operate and maintain. If the annual savings is Rs. 20 lakhs, the payback period will be
8 years
2.7 years
3 years
10 years
Answer: C) 3 years
Confirmed vs Book-1 §7.3 — Simple payback = Capital cost / ANNUAL NET savings, and net savings = yearly benefit - yearly O&M cost.
Net savings = 20 - 2 = Rs.18 lakh/yr; Payback = 54 / 18 = 3 years. (Dividing by the gross 20 lakh gives the trap answer 2.7 yr.)
Source: Apr 2010
📖 §7.3 Financial Analysis Techniques — Return on Investment (ROI)
5. The ratio of annual net cash flow to capital cost is ____
net present value
internal rate of return
return on investment
discount factor
Answer: C) return on investment
Confirmed vs Book-1 §7.3 — Book: 'ROI expresses the annual return expected from a project as a percentage of capital cost.' ROI = annual net cash flow / capital cost.
NPV and IRR are discounted measures and the discount factor is 1/(1+k)^n, so only ROI matches the stated ratio.
Source: Apr 2010
📖 §7.3 Financial Analysis Techniques — Time Value of Money
6. Which of the following equation is used to calculate the future value of the cash flow?
NPV (1 – i)n
NPV / (1 – i)n
NPV (1 + i)n
NPV/ (1 + i)n
Answer: C) NPV (1 + i)n
Confirmed vs Book-1 §7.3 — Book relation: FV = NPV (1 + i)^n, and inversely NPV = FV / (1 + i)^n.
Future value therefore requires COMPOUNDING at (1 + i)^n, e.g. Rs.100 at 10% becomes Rs.110 after one year.
Source: 2018
📖 §7.3 Financial Analysis Techniques — Return on Investment (ROI)
7. For a project to be viable, the ROI must always be ___ the interest rate.
lower than
higher than
equal to
no relation to
Answer: B) higher than
Confirmed vs Book-1 §7.3 — Book: 'ROI must always be higher than cost of money (interest rate) so as to make the project attractive; the greater the return on investment the better.'
If ROI were below the borrowing rate the project would destroy value.
it considers the cash flow streams in its entirety
does not distinguish between lending and borrowing
none of the above
Answer: D) none of the above
Confirmed vs Book-1 §7.3 — Book lists as IRR advantages: it takes account of the time value of money and considers the cash-flow stream in its entirety - so (a) and (b) are true.
Its stated limitation is that 'the internal rate of return figure cannot distinguish between lending and borrowing' - so (c) is also true of IRR.
All three statements are true, hence 'none of the above' is the statement that is NOT true.
9. The internal rate of return is the discount rate for which the NPV is ____.
Always positive
Always negative
negative or positive
None of the above
Answer: D) None of the above
Confirmed vs Book-1 §7.3 — Book: 'The internal rate of return (IRR) of a project is the discount rate which makes its net present value (NPV) equal to zero.'
NPV at the IRR is ZERO - not always positive, always negative, or either - so 'none of the above' is correct.
Source: Jul 2022
📖 §7.3 Financial Analysis Techniques — Time Value of Money
10. The present value of equipment is Rs. 10,000 and discount rate is 10%. The future value of the cash flow at the end of 2 years is:
Rs. 10000
Rs. 12,100
Rs. 8100
Rs. 8264
Answer: B) Rs. 12,100
Confirmed vs Book-1 §7.3 — FV = PV(1+i)^n = 10,000 x (1.10)^2 = 10,000 x 1.21 = Rs.12,100.
Rs.8,264 and Rs.8,100 are discounted (present-value) figures, which is the reverse operation.
Source: Nov 2009
📖 § ESCO route / Ag-DSM through ESCOs
11. Which among the following can be best implemented through an ESCO (Energy Service Company) route:
coal procurement contract for captive power plant
energy efficient design of a municipal lighting system
large Waste Heat Recovery System in a large process plant, where external financing is sought
energy and mass balance study of a Steel Plant
Answer: C) large Waste Heat Recovery System in a large process plant, where external financing is sought
Confirmed vs Book-1 §2.3.3 — The ESCO model fits capital-intensive projects where outside financing is sought and the savings can be measured and paid back out of — exactly the case of a large waste-heat recovery system. A coal procurement contract and a one-off energy & mass balance study generate no guaranteed measurable savings stream, and a municipal lighting design alone is a smaller design task.
Source: Nov 2009
📖 §7.3 Financial Analysis Techniques — Return on Investment (ROI)
12. The cost of replacement of an inefficient chiller with an energy efficient chiller was Rs. 10 lakh. The net annual cash flow is Rs. 2.50 lakh. The return on investment is:
18%
20%
15%
none of the above
Answer: D) none of the above
Confirmed vs Book-1 §7.3 — ROI = (Annual net cash flow / Capital cost) x 100 = (2.50 / 10.00) x 100 = 25%.
25% is not offered in (a), (b) or (c), so the answer is 'none of the above'.
Source: Nov 2009
📖 §7.7 Energy Performance Contracting and Role of ESCOs
13. The contractor provides the financing and is paid an agreed fraction of actual savings achieved, used to pay down the debt costs of equipment/services. This is known as
traditional contract
extended technical guarantee/service
performance Contract
shared savings performance contract
Answer: D) shared savings performance contract
Confirmed vs Book-1 §7.7 — Book, Types of Performance Contracting: 'In shared savings, ESCO designs, FINANCES and implements the project, verifies energy savings and shares an agreed percentage of the actual energy savings over a fixed period with the customer.'
ESCO financing + payment out of an agreed fraction of actual savings = shared savings performance contract.
Source: Nov 2009
📖 §7.5 Sensitivity and Risk Analysis
14. In project financing, sensitivity analysis is applied because
almost all the cash flows involve uncertainly
it evaluates how sensitive the project is to change in the input parameters
it assesses the impact of ‘what if one or more factors are different from what is predicted’
it is applicable to all the above situations
Answer: D) it is applicable to all the above situations
Confirmed vs Book-1 §7.5 — Book, Section 7.5: cash flows contain uncertainty; sensitivity analysis asks 'How sensitive is the project's feasibility to changes in the input parameters?' and 'What if one or more of the factors is not as favourable as predicted?'
All three statements are drawn from the same passage, so 'all of the above'.
15. To calculate internal rate of return, the net present value is set to
1
0
10
100
Answer: B) 0
Confirmed vs Book-1 §7.3 — Book: 'By setting the net present value of an investment to zero ... the discount rate can be computed.'
IRR is therefore the discount rate at which NPV = 0.
Source: Nov 2009
📖 §7.3 Comparison between Net Present Value and Internal Rate of Return
16. The discount rate is used as an input in determining _________.
NPV
IRR
payback period
all of the above
Answer: A) NPV
Confirmed vs Book-1 §7.3 — Book: 'In the net present value calculation, NPV of the project is determined by ASSUMING that the discount rate (cost of capital) is KNOWN. In the internal rate of return calculation, we set the net present value equal to zero and DETERMINE the discount rate.'
So the discount rate is an INPUT to NPV, while for IRR it is the OUTPUT; simple payback ignores discounting altogether.
Source: 2019
📖 §7.3 Financial Analysis Techniques — Simple Payback Period
17. The cost of an economizer is Rs. 2 lakhs. The simple payback period (SPP) in years considering annual savings of Rs 1,10,000 and annual maintenance cost of Rs 10,000 is ___________.
1.8
2.5
2
0.5
Answer: C) 2
Confirmed vs Book-1 §7.3 — Annual net savings = 1,10,000 - 10,000 = Rs.1,00,000/yr (O&M must be subtracted first).
SPP = 2,00,000 / 1,00,000 = 2 years. (Using the gross Rs.1.10 lakh gives the distractor 1.8 yr.)
The internal rate of return is the discount rate for which the NPV is Zero
NPV is the internal rate of return for which the discount rate is Zero
The discount rate is the internal rate of return for which NPV is positive
NPV is the discount rate for which internal rate of return is positive
Answer: A) The internal rate of return is the discount rate for which the NPV is Zero
Confirmed vs Book-1 §7.3 — Book: IRR is the discount rate that makes NPV equal to zero - statement (a) exactly.
The other three statements invert the roles of NPV and the discount rate and are meaningless.
Source: 2019
📖 §7.3 Financial Analysis Techniques — Simple Payback Period
19. Which of the following statements are true regarding simple payback period?
considers impact of cash flow even after payback period
takes into account the time value of money
considers cash flow throughout the project life cycle
determines how quickly invested money is recovered
Answer: D) determines how quickly invested money is recovered
Confirmed vs Book-1 §7.3 — Book: payback 'is a measure of how long it will be before the investment recovers itself', i.e. how quickly the invested money comes back.
Its stated limitations are that it ignores the time value of money and ignores all savings after the payback period - so (a), (b) and (c) are false.
Source: 2019
📖 §7.3 Financial Analysis Techniques — Simple Payback Period
20. A waste heat recovery system requires Rs. 50 lakhs investment and Rs. 2 lakhs per year to operate and maintain. If the annual savings is Rs. 22 lakhs, the payback period will be
2.28 years
2.5 years
3 years
10 years
Answer: B) 2.5 years
Confirmed vs Book-1 §7.3 — Annual net savings = 22 - 2 = Rs.20 lakh/yr.
Simple payback = 50 / 20 = 2.5 years. (50/22 = 2.28 yr is the trap that forgets O&M.)
Source: 2018
📖 §7.3 Financial Analysis Techniques — Return on Investment (ROI)
21. For investment decision, ROI must always be _____ prevailing interest rate.
Lower than
Higher than
Equal to
No relation
Answer: B) Higher than
Confirmed vs Book-1 §7.3 — Book: 'ROI must always be higher than cost of money (interest rate) so as to make the project attractive.'
Only then does the project earn more than the funds cost.
Source: 2018
📖 §7.4 Cash Flow — Capital Investment Considerations
22. If asset depreciation is considered, then net operating cash inflow would be
lower
higher
no effect
none of the above
Answer: B) higher
Corrected (was a) — Book-1 §7.4: Book, Section 7.4: net operating cash inflows are the annual benefits 'after adjusting for applicable taxes and effects of depreciation'; and the depreciation box states that tax law permits depreciation allowances as 'reasonable deductions from TAXABLE INCOME'.
Depreciation is a NON-CASH charge, so it does not reduce cash; it only lowers taxable income and hence tax paid. The tax saved (depreciation x tax rate) is retained, so the net operating cash inflow becomes HIGHER.
The book confirms depreciation is a benefit: a true lease gives 'no depreciation TAX BENEFITS', and with an ESCO 'the tax benefits of depreciation ... must be negotiated'.
Source: 2018
📖 §7.3 Comparison between Net Present Value and Internal Rate of Return
23. Which technique takes care of time value of money in evaluation?
payback period
IRR
NPV
Both (b) & (c)
Answer: D) Both (b) & (c)
Confirmed vs Book-1 §7.3 — Book: both NPV and IRR are discounted cash-flow methods whose stated advantage is 'It takes into account the time value of money.'
The word 'simple' in simple payback denotes that time value of money is NOT considered, so the answer is both (b) and (c).
Source: 2018
📖 §7.3 Financial Analysis Techniques — Return on Investment (ROI)
24. The retrofitting of a variable speed drive in a plant costs Rs 2 lakh. The annual savings is Rs 0.5 lakh. The maintenance cost is Rs. 5,000/year. The return on investment is
25%
22.5%
24%
27.5%
Answer: B) 22.5%
Confirmed vs Book-1 §7.3 — Annual NET cash flow = 0.50 - 0.05 = Rs.0.45 lakh/yr (maintenance Rs.5,000 = Rs.0.05 lakh must be deducted).
ROI = (0.45 / 2.00) x 100 = 22.5%. (Ignoring maintenance gives the distractor 25%.)
Source: 2017
📖 §7.3 Financial Analysis Techniques — Return on Investment (ROI)
25. The cost of replacement of inefficient chiller with an energy efficient chiller in a plant was Rs. 10 lakh .The net annual cash flow is Rs 2.50 lakh .The return on investment is:
18%
20%
15 %
none of the above
Answer: D) none of the above
Confirmed vs Book-1 §7.3 — ROI = (2.50 / 10.00) x 100 = 25%, which is not listed in (a), (b) or (c).
Hence 'none of the above'. (Equivalently payback = 4 years and ROI = 1/4 = 25%.)
Source: 2017
📖 §7.7 Energy Performance Contracting and Role of ESCOs
26. The contractor provides the financing and is paid an agreed fraction of actual savings achieved. This payment is used to pay down the debt costs of equipment and/or services. This is known as
traditional contract
extended technical guarantee/service
performance Contract
shared savings performance contract
Answer: D) shared savings performance contract
Confirmed vs Book-1 §7.7 — Book: in SHARED SAVINGS the ESCO 'designs, finances and implements the project, verifies energy savings and shares an agreed percentage of the actual energy savings over a fixed period with the customer.'
ESCO-provided finance repaid out of an agreed fraction of measured savings = shared savings performance contract.
27. Which of the following statements regarding ECBC are correct? i) ECBC defines the norms of energy requirements per cubic metre of area ii) ECBC does not encourage retrofit of Energy conservation measures iii) ECBC prescribes energy efficiency standards for design and construction of commercial and industrial buildings iv) One of the key objectives of ECBC is to minimize life cycle costs (construction and operating energy costs)
i
ii
iii
iv
Answer: D) iv
Confirmed vs Book-1 §7.3 — (i) is wrong - ECBC norms are per SQUARE metre, not cubic metre; (ii) is wrong - ECBC does encourage retrofit of energy conservation measures; (iii) is wrong as worded - ECBC prescribes standards for COMMERCIAL buildings, not industrial buildings.
(iv) is correct: a key ECBC objective is to minimise LIFE CYCLE COST (construction plus operating energy cost) - the same life-cycle logic used in Chapter 7 investment appraisal.
Source: 2016
📖 §7.3 Financial Analysis Techniques — Time Value of Money
28. What is the future value of Rs.1000/- after 3 years, if the interest rate is 10%
Rs. 1331
Rs.1610
Rs.3221
none of the above
Answer: A) Rs. 1331
Confirmed vs Book-1 §7.3 — FV = PV(1+i)^n = 1,000 x (1.10)^3 = 1,000 x 1.331 = Rs.1,331.
Rs.1,610 would be 1,000 x 1.10 x ... (simple mis-compounding) and Rs.3,221 is unrelated.
Source: 2016
📖 §7.2 Investment — Need, Appraisal and Criteria
29. Any management would like to invest in projects with
Low IRR
Low ROI
Low NPV of future returns
none of the above
Answer: D) none of the above
Confirmed vs Book-1 §7.2 — Book: management invests capital 'where it is going to obtain the greatest return'; a higher IRR, higher ROI and higher NPV are all preferred (the book: 'the higher the net present value, the more attractive is the proposed project').
All three options describe LOW values, which no management would prefer - hence 'none of the above'.
Source: 2016
📖 §7.3 Financial Analysis Techniques — Simple Payback Period
30. Which of these is not true of payback period
Simple to calculate
Considers cash flow beyond the payback period
Shorter the period the better
Does not take into account, time value of money
Answer: B) Considers cash flow beyond the payback period
Confirmed vs Book-1 §7.3 — Book limitation: 'The payback period does not consider savings that are accrued AFTER the payback period has finished.'
The other three statements are true of payback (simple to calculate, shorter is better, ignores time value of money), so (b) is the false one.
Source: 2016
📖 §7.3 Financial Analysis Techniques — Return on Investment (ROI)
31. The return on investment (ROI), is expressed as
annual cost / capital cost
(first cost / first year benefits) x 100
NPV / IRR
(annual net cash flow x 100) / capital cost
Answer: D) (annual net cash flow x 100) / capital cost
Confirmed vs Book-1 §7.3 — Book formula: ROI = (Annual net cash flow / Capital cost) x 100.
Example 7.3: (25,000 / 1,00,000) x 100 = 25%.
Source: 2012
📖 §7.3 Financial Analysis Techniques — Net Present Value Method
32. _________ considers impact of cash flow even after payback period
net present value
return on investment
sensitivity analysis
simple payback period
Answer: A) net present value
Confirmed vs Book-1 §7.3 — Book: NPV 'considers the cash flow stream in entire project life', i.e. it values every cash flow including those arising after the simple payback point.
ROI and simple payback ignore post-payback cash flows and the time value of money; sensitivity analysis is a risk test, not a cash-flow criterion.
Source: 2013
📖 §7.5 Sensitivity and Risk Analysis
33. __________ determines the project viability in response to changes in input parameters.
Life cycle analysis
Financial analysis
Sensitivity analysis
Payback analysis
Answer: C) Sensitivity analysis
Confirmed vs Book-1 §7.5 — Book, Section 7.5: sensitivity analysis asks 'How sensitive is the project's feasibility to changes in the input parameters?' and identifies the switching values at which the decision flips from accept to reject.
So it is sensitivity analysis that tests viability against changes in the inputs.
Source: 2013
📖 §7.3 Financial Analysis Techniques — Return on Investment (ROI)
34. For a project to be financially attractive, ROI must always be ___ than interest rate.
lower
higher
equal
no relation
Answer: B) higher
Confirmed vs Book-1 §7.3 — Book: 'ROI must always be higher than cost of money (interest rate) so as to make the project attractive.'
A project returning less than the interest rate cannot service the cost of the funds.
Source: 2013
📖 §7.5 Sensitivity and Risk Analysis
35. Which of the following macro factors is used in the sensitivity analysis of project finance?
Change in tax rates
Changes in maintenance cost
Changes in debt: equity ratio
Change in forms of financing
Answer: A) Change in tax rates
Confirmed vs Book-1 §7.5 — Book lists MACRO factors as those the firm's management cannot change: changes in interest rates, CHANGES IN TAX RATES, accounting standards/depreciation methods and rates, subsidies, employment trends, regulations, energy price and technology changes.
Maintenance cost, debt:equity (capital structure) and form of finance are listed as MICRO factors.
36. Which of the following statements regarding ECBC are correct? ECBC defines the norms of energy requirements per sq. metre of area taking into account climatic region where building is located ii) ECBC does not encourage retrofit of Energy conservation measures iii) ECBC prescribes energy efficiency standards for design and construction of commercial and industrial buildings iv) One of the key objectives of ECBC is to minimize life cycle costs (construction and operating energy costs)
i & ii
i & iii
ii & iii
i & iv
Answer: D) i & iv
Confirmed vs Book-1 §7.3 — (i) is correct - ECBC fixes energy norms per SQ. METRE taking the climatic zone into account; (iv) is correct - a key objective is minimising life cycle cost (construction + operating energy cost).
(ii) is wrong (ECBC does encourage retrofit) and (iii) is wrong as worded (commercial buildings, not industrial). Hence i & iv.
37. Which of the following statements regarding Internal Rate of Return (IRR) is correct?
IRR distinguishes between lending and borrowing
Internal rate of return is the discount rate at which net present value is equal to zero
if the IRR is higher than current interest rate, the investment is not attractive
between two alternative projects, the project with lower internal rate of return would be considered more attractive
Answer: B) Internal rate of return is the discount rate at which net present value is equal to zero
Confirmed vs Book-1 §7.3 — Book: IRR is the discount rate at which NPV = 0; 'if this discount rate is greater than current interest rate, the investment is sound'; and among alternatives one chooses 'the investment with the highest rate of return'.
So (a), (c) and (d) are contradicted by the book and only (b) is correct.
Source: 2012
📖 §7.3 Financial Analysis Techniques — Simple Payback Period
38. The cost of a new heat exchanger is Rs. 1.0 lakh. The simple payback period in years considering annual savings of Rs 60,000 and annual operating cost of Rs. 10,000 is
0.50
1.66
2.00
6.00
Answer: C) 2.00
Confirmed vs Book-1 §7.3 — Annual net savings = 60,000 - 10,000 = Rs.50,000/yr.
SPP = 1,00,000 / 50,000 = 2.00 years. (1,00,000/60,000 = 1.66 yr is the trap that ignores operating cost.)
Source: 2012
📖 §7.3 Financial Analysis Techniques — Time Value of Money
39. What does the concept of time value of money imply
present value of money
future value of money
discounting of cash flows
all of the above
Answer: D) all of the above
Confirmed vs Book-1 §7.3 — Book: the value of money changes with time; discounting gives the PRESENT value of a future cash flow and compounding gives the FUTURE value of a present cash flow (FV = NPV(1+i)^n, NPV = FV/(1+i)^n).
Time value of money therefore embraces present value, future value and discounting of cash flows - all of the above.
Source: Guidebook
📖 §7.3 Financial Analysis Techniques — Return on Investment (ROI)
40. Return on Investment (ROI) as a fraction means
initial investment / annual return
annual cost / cost of capital
annual net cash flow / capital cost
none of the above
Answer: C) annual net cash flow / capital cost
Confirmed vs Book-1 §7.3 — Book: ROI = (Annual net cash flow / Capital cost) x 100; as a fraction, annual net cash flow / capital cost.
It is the inverse of the simple payback period.
Source: Guidebook
📖 §7.3 Financial Analysis Techniques — Net Present Value Method
41. The net present value (NPV) is
equal to the sum of the present values of all cash flows
equal to the sum of returns
equal to the sum of all cash flows
none of the above
Answer: A) equal to the sum of the present values of all cash flows
Confirmed vs Book-1 §7.3 — Book: 'The net present value (NPV) of a project is equal to the sum of the present values of all the cash flows associated with it', costs negative and savings positive.
Adding undiscounted cash flows (option c) is exactly what NPV avoids.
42. The Internal Rate of Return (IRR) of an investment is calculated by
selecting a discount rate so that NPV = 0
equating total discounted costs with total discounted benefits
making sure the benefit / cost ratio equals unity
all of the above
Answer: D) all of the above
Confirmed vs Book-1 §7.3 — Setting NPV = 0 and solving for the discount rate (a) is the definition; NPV = 0 also means discounted benefits equal discounted costs (b), which is the same as a benefit/cost ratio of unity (c).
All three are equivalent statements of the IRR condition, so 'all of the above'.
Source: Guidebook
📖 §7.3 Comparison between Net Present Value and Internal Rate of Return
43. Project A has an IRR of 85% and NPV of Rs 15,000; project B has an IRR of 25% and NPV of Rs 200,000. Which project would you implement first if financing is available and project technical life is the same?
B
A
cannot be decided
question does not make sense
Answer: A) B
Confirmed vs Book-1 §7.3 — Book: 'The higher the net present value, the more attractive is the proposed project', and NPV 'is essentially a comparison tool which enables number of different projects to be compared'.
With finance available and equal technical life, choose the larger absolute wealth gain: B (NPV Rs.2,00,000) over A (NPV Rs.15,000), despite A's higher IRR - the book notes a high IRR need not be desirable.
Source: Guidebook
📖 §7.3 Financial Analysis Techniques — Time Value of Money
44. Which of the following equation can be used to calculate the future value from the present value of cash?
NPV = FV x (1 + i)^n
FV = NPV x (1 - i)^n
NPV = FV / (1 + i)^n
none of the above
Answer: C) NPV = FV / (1 + i)^n
Confirmed vs Book-1 §7.3 — Book relation: FV = NPV (1 + i)^n, or equivalently NPV = FV / (1 + i)^n - the two are the same equation rearranged, so (c) is the only equation printed in the book that links present and future value.
Options (a) and (b) are mathematically false forms (wrong side / (1 - i)^n), so (c) is the correct choice.
Source: Guidebook
📖 §7.3 Financial Analysis Techniques — Net Present Value Method
45. The Net Present Value of a project at a discount rate of 16% with an investment of Rs 50,000 at the beginning of the first year, and savings of Rs 23,000 and Rs 36,000 at the end of the first and second year respectively is
6,581
-246
862
-3,419
Answer: D) -3,419
Corrected (was a) — Book-1 §7.3: Investment is at the BEGINNING of year 1 (t = 0), so it is not discounted. PV factors at 16%: 0.862 (yr 1) and 0.743 (yr 2).
NPV = -50,000 + 23,000(0.862) + 36,000(0.743) = -50,000 + 19,826 + 26,748 = -Rs.3,419 (exact factors give -3,418.5).
The NPV is NEGATIVE Rs.3,419, so option (d) is correct (the guidebook prints the figure without its minus sign) and the project would be rejected at 16%.
Source: Guidebook
📖 §7.3 Financial Analysis Techniques — Time Value of Money
46. A sum of Rs 10,000 is deposited in a bank at the beginning of a year. The bank pays 6% interest annually. How much money is in the bank account at the end of the fifth year, if no money is withdrawn?
13,382
12,625
13,000
10,937
Answer: A) 13,382
Confirmed vs Book-1 §7.3 — FV = PV(1+i)^n = 10,000 x (1.06)^5 = 10,000 x 1.33823 = Rs.13,382.
Rs.13,000 is simple (non-compounded) interest, so compounding gives (a).
Source: Guidebook
📖 §7.3 Financial Analysis Techniques — Return on Investment (ROI)
47. The broad indicator of the annual return expected from initial capital investment is
NPV
IRR
ROI
Discount factor
Answer: C) ROI
Confirmed vs Book-1 §7.3 — Book: 'ROI expresses the annual return expected from a project as a percentage of capital cost or initial investment.'
NPV and IRR are discounted-cash-flow measures and the discount factor is only a multiplier, so ROI is the broad annual-return indicator.
Source: Guidebook
📖 §7.7 Energy Performance Contracting and Role of ESCOs
48. Which among the following is not a typical performance contract
Shared savings
Guaranteed savings
Fixed fee
Hire purchase
Answer: D) Hire purchase
Confirmed vs Book-1 §7.7 — Book: 'The ESCO will usually offer the following options: Fixed fee, Shared savings, Guaranteed savings.'
Hire purchase is an equipment-purchase/credit arrangement, not a performance contract - payment is not linked to measured energy savings.
Source: Guidebook
📖 §7.3 Financial Analysis Techniques — Time Value of Money
49. If the NPV of an investment is Rs.10000 when calculated at a discount rate of 10%. What is the future value of the investment for a period of 2 years.
12100
12000
12110
12101
Answer: A) 12100
Confirmed vs Book-1 §7.3 — FV = NPV(1+i)^n = 10,000 x (1.10)^2 = 10,000 x 1.21 = Rs.12,100.
The other options are not consistent with two years of compounding at 10%.
Source: Mar 2023
📖 §7.3 Financial Analysis Techniques — Return on Investment (ROI)
50. ROI should be always ____ than borrowing interest rate for economic feasibility of any project.
Lower
Equal
No relation
Higher
Answer: D) Higher
Confirmed vs Book-1 §7.3 — Book: 'ROI must always be higher than cost of money (interest rate) so as to make the project attractive.'
Only a return above the borrowing rate leaves a surplus after servicing the loan.
51. Which of the following is true with respect to IRR?
If IRR is high than the current interest rate, the investment is not attractive
If between two projects the project with low IRR would be more attractive
IRR is the discount rate at which the NPV is zero
All of the above
Answer: C) IRR is the discount rate at which the NPV is zero
Confirmed vs Book-1 §7.3 — Book: IRR is the discount rate at which NPV = 0 - statement (c).
The book also says a project is sound when IRR EXCEEDS the current interest rate and that one selects the HIGHEST rate of return, so (a) and (b) are wrong and 'all of the above' fails.
52. Select the wrong statement for financial analysis ____.
Simple Payback is a measure of how long it will be before the investment makes money
Return on Investment (ROI) and Internal Rate of Return (IRR) enable comparison with other investment options
Net present value (NPV) is the difference between the present value of cash inflows and the present value of cash outflows over a period of time
Depreciation and payback are two deciding factors about the time value of money.
Answer: D) Depreciation and payback are two deciding factors about the time value of money.
Confirmed vs Book-1 §7.3 — Statements (a), (b) and (c) restate the book: payback measures how long before the investment recovers itself; ROI and IRR allow comparison with other investment options; NPV nets discounted inflows against discounted outflows.
Statement (d) is wrong - the time value of money is handled by DISCOUNTING (NPV/IRR); depreciation is a tax allowance and simple payback expressly ignores time value.
Source: Mar 2023
📖 §7.3 Financial Analysis Techniques — Return on Investment (ROI)
53. The retrofitting of a variable speed drive in a plant costs Rs 2 lakh. The annual savings is Rs 0.4 lakh. The maintenance cost is Rs. 0.05 lakh/year. The return on investment is ____.
25%
22.5%
24%
17.5%
Answer: D) 17.5%
Confirmed vs Book-1 §7.3 — Annual NET cash flow = 0.40 - 0.05 = Rs.0.35 lakh/yr.
ROI = (0.35 / 2.00) x 100 = 17.5%. (Forgetting the Rs.0.05 lakh maintenance gives the distractor 20-25% band.)
Source: Jul 2022
📖 §7.3 Financial Analysis Techniques — Time Value of Money
54. Find the future value of Rs. 1,000 at an interest rate of 10% in 10 years' time.
Rs. 2,594
Rs. 386
Rs. 349
Rs. 10,000
Answer: A) Rs. 2,594
Confirmed vs Book-1 §7.3 — FV = PV(1+i)^n = 1,000 x (1.10)^10 = 1,000 x 2.5937 = Rs.2,594.
Rs.386 is the reverse operation (present value of Rs.1,000 due in 10 years).
Source: Jul 2022
📖 §7.3 / general energy-accounting term
55. "Toe" stands for ____.
Total oil equivalent
Tons of effluent
Tons of energy equivalent
Tons of oil equivalent
Answer: D) Tons of oil equivalent
Confirmed vs Book-1 §7.3 — 'toe' = tonne (ton) of oil equivalent, the common energy unit used to aggregate different fuels in energy and financial accounting (1 toe = 10^7 kcal).
The other expansions are not standard energy units.
Source: Jul 2022
📖 §7.5 Sensitivity and Risk Analysis
56. Sensitivity analysis is an assessment of ____.
Profits
Losses
Risks
All of the above
Answer: C) Risks
Confirmed vs Book-1 §7.5 — Book, Section 7.5, opening line: 'Sensitivity analysis is an assessment of risk.'
It tests how far an uncertain input can move before the project becomes unviable (e.g. feasible at 10% energy-cost escalation but break-even at 9% implies high risk).
Source: Jul 2022
📖 §7.6 Financing Options
57. Which of the following is NOT a conventional financing option?
Debt financing
Performance contracting
Retained earnings
Stock buyback
Answer: D) Stock buyback
Confirmed vs Book-1 §7.6 — Book, Section 7.6, lists the conventional financing options: debt financing, equity financing, retained earnings, capital lease, true lease and performance contracting.
Stock buyback is a distribution of surplus to shareholders, not a source of funds for capital investment.
Source: Sep 2025
📖 §7.3 Comparison between Net Present Value and Internal Rate of Return
58. Two projects: X (IRR=40%, NPV= Rs 50,000/-) and Y (IRR=30%, NPV= Rs 1,20,000/-) having same life, no finance limit. Choose the best project.
X
Y
Cannot decide
Question invalid
Answer: B) Y
Confirmed vs Book-1 §7.3 — Book: 'The higher the net present value, the more attractive is the proposed project'; NPV measures absolute wealth added and is the comparison tool between projects.
With equal life and no financing constraint, choose Y (NPV Rs.1,20,000) over X (NPV Rs.50,000) even though X has the higher IRR - the book warns a high IRR alone is not a desirable feature.
Source: Sep 2025
📖 §7.7 What is Depreciation? (box)
59. Term for asset value decrease over time:
Discounting
Inflation
Depreciation
Compounding
Answer: C) Depreciation
Confirmed vs Book-1 §7.7 — Book: 'Most assets used in the course of a business decrease in value over time. Tax law permits reasonable deductions from taxable income to allow for this. These deductions are called depreciation allowances.'
Discounting/compounding relate present and future values, and inflation is a general price effect - only depreciation is the loss of asset value with time.
Source: Sep 2025
📖 §7.4 Cash Flow — Capital Investment Considerations
60. Life-cycle costing is better than simple purchase cost because it:
Includes operation, maintenance and energy costs over life
Ignores maintenance costs
Forces single-supplier bidding
Cuts down procurement cycle time
Answer: A) Includes operation, maintenance and energy costs over life
Confirmed vs Book-1 §7.4 — Book, Section 7.4, requires all four elements to be considered - initial capital cost, net operating cash inflows, economic life and salvage value - not the purchase price alone.
Life-cycle costing therefore adds operating, maintenance and energy costs over the whole economic life to the first cost, which is why it is the sounder basis for a decision.
Source: Sep 2025
📖 § ESCO contracting models (general)
61. In a 'Guaranteed Savings' ESCO project, the ESCO company would not be involved in:
Project design
Project finance
Project implementation
Verifying energy savings
Answer: B) Project finance
Confirmed vs Book-1 §2 (general) — In the Guaranteed Savings model the CUSTOMER arranges and carries the project financing, while the ESCO designs, implements and guarantees — and therefore also verifies — the savings. Confusing it with the Shared Savings model, where the ESCO finances the project, is the trap.
Source: Sep 2025
📖 §7.3 Financial Analysis Techniques — Return on Investment (ROI)
62. ROI for an investment of Rs 1,00,000 with an annual return of Rs 20,000 per year is_______
1%
10%
20%
200%
Answer: C) 20%
Confirmed vs Book-1 §7.3 — ROI = (Annual net cash flow / Capital cost) x 100 = (20,000 / 1,00,000) x 100 = 20%.
Cross-check with the inverse relation: payback = 1,00,000/20,000 = 5 years, and 1/5 = 20%.
Source: Sep 2025
📖 §7.3 Financial Analysis Techniques — Simple Payback Period
63. What is the payback period in energy management?
Time taken to identify savings
Time taken to report savings
Time taken to recover the investment through savings
All of the above
Answer: C) Time taken to recover the investment through savings
Confirmed vs Book-1 §7.3 — Book: the payback period is 'the time (number of years) required to recover the initial investment (capital cost), considering only the Annual Net Savings'.
It measures recovery of the investment out of savings, not the time to identify or report them.
Source: Sep 2024
📖 §7.6 Financing Options
64. Which of the following is a method for financing energy efficiency projects?
Loans
Leasing
Performance contracting
All of the above
Answer: D) All of the above
Confirmed vs Book-1 §7.6 — Book, Section 7.6: financing options include debt financing (loans and bonds), leases (capital lease and true lease) and performance contracting through ESCOs, besides equity and retained earnings.
All three listed routes are used to finance energy efficiency projects.
Source: Sep 2024
📖 §7.3 Financial Analysis Techniques — Net Present Value Method
65. What is the primary financial metric used to evaluate energy projects?
Gross margin
Net present value (NPV)
Revenue
Operating income
Answer: B) Net present value (NPV)
Confirmed vs Book-1 §7.3 — Book: NPV 'takes into account the time value of money and it considers the cash flow stream in entire project life', and is the criterion used to accept (NPV > 0) or to rank competing energy projects.
Gross margin, revenue and operating income are accounting results, not project-appraisal criteria.
66. The internal rate of return is discount rate for which NPV is
Positive
Zero
Negative
All of the above
Answer: B) Zero
Confirmed vs Book-1 §7.3 — Book: 'The internal rate of return (IRR) of a project is the discount rate, which makes its net present value (NPV) equal to zero.'
In Example 7.5 the NPV falls from +2,791 at 8% to -1,508 at 16% and passes through zero at IRR = 12.88%.
Source: Sep 2024
📖 §7.3 Comparison between Net Present Value and Internal Rate of Return
67. Which techniques takes care of time value of money in evaluation?
Payback Period
IRR
NPV
Both B and C
Answer: D) Both B and C
Confirmed vs Book-1 §7.3 — Both NPV and IRR are discounted cash-flow methods; the book lists 'It takes into account the time value of money' as an advantage of each.
Simple payback expressly excludes it - that is what the prefix 'simple' denotes - so the answer is both (b) and (c).
Source: Sep 2024
📖 §7.4 Cash Flow — Capital Investment Considerations
68. If asset depreciation is considered, then the net operating cash inflow will be
Lower
Higher
No effect
None of the above
Answer: B) Higher
Confirmed vs Book-1 §7.4 — Book, Section 7.4: net operating cash inflows are the annual benefits 'after adjusting for applicable taxes and effects of depreciation'; the depreciation box notes these allowances are deductions from TAXABLE INCOME.
Depreciation is a non-cash charge, so it reduces tax payable without reducing cash; the tax saved is retained and the net operating cash inflow is HIGHER.
The book treats depreciation as a benefit - a true lease offers 'no depreciation tax benefits' and with an ESCO 'the tax benefits of depreciation ... must be negotiated'.
69. Which two appraisal techniques account for the time value of money?
Simple payback and ROI
NPV and IRR
ROI and NPV
Simple payback and IRR
Answer: B) NPV and IRR
Confirmed vs Book-1 §7.3 — the guidebook lists "It takes into account the time value of money" as the first advantage of BOTH the NPV method and the IRR method.
Payback is explicitly excluded: "The word 'simple' is used as a prefix ... to denote that time value of money is not considered", and under ROI limitations: "It does not take into account the time value of money."
Hence only NPV and IRR are discounted-cash-flow techniques → option (b).
Source: AI practice
📖 Book-1 §7.3 Simple Payback Period — Example 7.1
70. A cogeneration project costs Rs.90 lakh, saves Rs.23 lakh/yr in energy, and has an annual O&M cost of Rs.5 lakh. Its simple payback period is:
3.9 years
5 years
4 years
18 years
Answer: B) 5 years
Confirmed vs Book-1 §7.3 (Example 7.1) — Simple Payback = Capital cost / Annual NET savings, where "Annual Net savings is the cost savings achieved after all the operational costs have been met".
Working: net savings = 23 − 5 = Rs.18 lakh/yr; payback = 90 / 18 = 5 years. The book prints this exact sum as 90/(23−5) = 5 years.
Trap: dividing by the gross Rs.23 lakh gives 3.9 years — O&M must be netted off first.
Source: AI practice
📖 Book-1 §7.3 Return on Investment (ROI) — Example 7.3
71. An investment of Rs.1,00,000 yields an annual after-tax cash flow of Rs.25,000. The Return on Investment (ROI) is:
4%
25%
40%
2.5%
Answer: B) 25%
Confirmed vs Book-1 §7.3 (Example 7.3, identical figures) — ROI = (Annual net cash flow / Capital cost) × 100 = (25,000 / 1,00,000) × 100 = 25%.
The book states "ROI is an inverse of payback period": payback here = 1,00,000/25,000 = 4 years and 1/4 = 25%.
Ch-7 Objective Q2 of the guidebook confirms ROI = annual net cash flow / capital cost.
Source: AI practice
📖 Book-1 §7.3 Time Value of Money (compounding); Ch-7 Objective Q8
72. Rs.10,000 is invested at 6% compound interest for 5 years. The future value is approximately:
Rs.13,000
Rs.13,382
Rs.12,625
Rs.16,000
Answer: B) Rs.13,382
Confirmed vs Book-1 §7.3 — the compounding relation is FV = PV(1+i)ⁿ (the book writes it as FV = NPV(1+i)ⁿ).
Working: FV = 10,000 × (1.06)⁵ = 10,000 × 1.33823 = Rs.13,382.
This is Ch-7 Objective Q8 of the guidebook, whose printed answer is 13,382. Distractors: Rs.13,000 is the simple-interest result (10,000 + 5×600) and Rs.12,625 is (1.06)⁴, i.e. one year short.
Source: AI practice
📖 Book-1 §7.3 Time Value of Money / NPV Method — discounting
73. The present value of Rs.1,00,000 to be received in 3 years, at a discount rate of 10% (PV factor = 0.751), is:
Rs.75,100
Rs.1,33,100
Rs.90,900
Rs.70,000
Answer: A) Rs.75,100
Confirmed vs Book-1 §7.3 — "discounting determines the present value of future cash flows": PV = FV/(1+i)ⁿ = FV × PV factor.
Working: PV = 1,00,000 × 0.751 = Rs.75,100. (0.751 = 1/1.10³, the same style of factor the book tabulates in Examples 7.4 and 7.5.)
Rs.1,33,100 is the compounding (future-value) answer, i.e. the wrong direction.
74. The Internal Rate of Return (IRR) of a project is defined as the discount rate at which:
NPV is maximum
NPV equals zero
Payback equals 1 year
ROI equals 100%
Answer: B) NPV equals zero
Confirmed vs Book-1 §7.3 — "The internal rate of return (IRR) of a project is the discount rate, which makes its net present value (NPV) equal to zero."
Guidebook Objective Q4 gives the same idea three ways (NPV = 0, discounted costs = discounted benefits, benefit/cost ratio = 1).
"If this discount rate is greater than current interest rate, the investment is sound."
Source: AI practice
📖 Book-1 §7.3 NPV Method; Ch-7 Objective Q7 (16% factors 0.862 / 0.743 as used in Example 7.5)
75. A project needs Rs.50,000 now and returns Rs.23,000 in year 1 and Rs.36,000 in year 2. At a 16% discount rate (factors 0.862 and 0.743), the NPV is approximately:
+Rs.9,000
−Rs.3,426
+Rs.3,426
−Rs.9,000
Answer: B) −Rs.3,426
Confirmed vs Book-1 §7.3 — NPV = Σ(cash flow × PV factor) − capital cost, using the book’s own 16% factors 0.862 (yr 1) and 0.743 (yr 2) from Example 7.5.
Working: 23,000×0.862 = 19,826; 36,000×0.743 = 26,748; total PV = 46,574; NPV = 46,574 − 50,000 = −Rs.3,426.
Decision rule: "reject the project if the net present value is negative" — so this project is rejected at 16%. (The guidebook’s own Objective Q7 prints the magnitude 3,419, the same figure using unrounded factors.)
76. Trial NPVs of a project are +Rs.495 at 12% and −Rs.65 at 13%. Using linear interpolation, the IRR is approximately:
12.5%
12.88%
13.12%
12.13%
Answer: B) 12.88%
Confirmed vs Book-1 §7.3 (Example 7.5, identical numbers) — IRR = Lower rate + [NPV at lower rate × (Higher − Lower)] / (NPV at lower − NPV at higher).
Working: 12 + [495 × (13 − 12)] / [495 − (−65)] = 12 + 495/560 = 12 + 0.884 = 12.88%.
The book quotes exactly 12.88%, and confirms it graphically in Figure 7.1 (NPV versus discount rate).
Source: AI practice
📖 Book-1 §7.7 Types of Performance Contracting; Ch-7 Objective Q10
77. Which of the following is NOT a type of energy performance contract?
Fixed fee
Shared savings
Guaranteed savings
Hire purchase
Answer: D) Hire purchase
Confirmed vs Book-1 §7.7 — "There are a few common types of contracts. The ESCO will usually offer the following options: Fixed fee, Shared savings, Guaranteed savings."
Fixed fee = lump sum, ESCO bears least risk; shared savings = ESCO finances and shares a % of actual savings; guaranteed savings = ESCO does not finance but guarantees savings cover debt service.
Hire purchase is an instalment-purchase financing arrangement, not a payment-on-performance contract — the answer to guidebook Objective Q10.
Source: AI practice
📖 Book-1 §7.7 What is Depreciation? (with §7.4 salvage value / economic life)
78. Straight-line depreciation of an asset is calculated as:
(Cost − Salvage value) / Useful life
Cost / Salvage value
Cost × Useful life
(Cost + Salvage value) / Useful life
Answer: A) (Cost − Salvage value) / Useful life
Confirmed vs Book-1 §7.7 / §7.4 — depreciation allowances are deductions from taxable income for assets that (i) produce income, (ii) wear out, and (iii) last more than a year.
The straight-line method writes off the depreciable amount evenly: Annual depreciation = (Cost − Salvage value) / Useful life, using the book’s own terms salvage (terminal) value and economic life from §7.4.
Being a non-cash deduction it lowers tax payable and so raises the after-tax net operating cash inflow — the "tax shield". Under a true lease (§7.6) no depreciation benefit exists because ownership never passes.
Source: AI practice
📖 Book-1 §7.3 Comparison between NPV and IRR; Ch-7 Objective Q5 (identical figures)
79. Project A has IRR 85% and NPV Rs.15,000; Project B has IRR 25% and NPV Rs.2,00,000. With equal life and financing available, which should be implemented first?
Project A, because its IRR is higher
Project B, because its NPV is higher
Neither, because IRR and NPV disagree
Both must have equal priority
Answer: B) Project B, because its NPV is higher
Confirmed vs Book-1 §7.3 — this is guidebook Ch-7 Objective Q5 with the same numbers, and its answer is B.
Reason given by the book: "The net present value method is essentially a comparison tool which enables number of different projects to be compared while the internal rate of return method is designed to assess whether or not a single project will achieve a target rate of return."
Also "The higher the net present value, the more attractive is the proposed project" — Rs.2,00,000 versus Rs.15,000, so B is implemented first when financing is available and lives are equal.
Source: AI practice
📖 Book-1 §7.6 Financing Options — True lease
80. Under a 'true lease', which statement is correct?
The lessee owns the asset and claims depreciation
Lease payments are tax-deductible but no depreciation benefit is available
Lease payments are not tax-deductible
The lessee always owns the asset at the end of the lease
Answer: B) Lease payments are tax-deductible but no depreciation benefit is available
Confirmed vs Book-1 §7.6 — "True lease allows use of equipment without ownership risks ... Lease payments are tax deductible. No depreciation tax benefits are available and ownership does not occur even at the end of lease period."
So (b) is exactly the book sentence; (a) and (d) contradict "ownership does not occur", and (c) contradicts "lease payments are tax deductible".
True lease suits SHORT-term use; debt financing (company owns the equipment) suits long-term use.
Source: AI practice
📖 §7.3.1 Simple payback period — Example 7.2, drawback of payback
81. Consider two competitive projects entailing investment of Rs.85,000/-. Project A returns Rs.50,000 at the end of each year, but Project B returns Rs.115,000 at the end of year 2. Which project is superior?
Project A since it starts earning by end of first year itself and recovers cost before end of two years
Project B since it offers higher return in two years
both projects are equal in rank
insufficient information
Answer: D) insufficient information
This is the book's own criticism of payback dressed as an MCQ: payback ignores everything that happens after the money is recovered, so ranking two schemes needs the FULL cash-flow profile and the project life, neither of which is given here. Project A recovers Rs 85,000 within year 2 and B in year 2 as well, but with no life, no O&M and no discount rate you cannot say which is superior. Hook: payback is blind after payday.
Source: Aug 2013
📖 §7.2 Investment — need, appraisal and criteria (escalation of energy cost)
82. The annual electricity bill for a plant is Rs 110 lakhs and accounts for 38% of the total energy bill. Furthermore the total energy bill increases by 5% each year. The plant's annual energy bill at the end of the third year will be about ________
Rs 335 lakhs
Rs 268 lakhs
Rs 386 lakhs
Rs 418 lakhs
Answer: A) Rs 335 lakhs
Working: total energy bill now = 110/0.38 = Rs 289.5 lakh. Escalate three years at 5%: 289.5 × 1.05³ = 289.5 × 1.1576 ≈ Rs 335 lakh. The trap is escalating the ELECTRICITY bill (110 × 1.05³ = 127) or forgetting to gross up by the 38% share. Read the question for which bill grows — here it is the total energy bill.
Source: Aug 2013
📖 §7.3.3 Time value of money — present value
83. The present value of Rs. 1,000 in 10 years' time at an interest rate of 10% is
Rs. 2,594
Rs. 386
Rs. 349
Rs. 10,000
Answer: B) Rs. 386
PV = FV/(1+i)^n = 1000/1.1¹⁰ = 1000/2.594 = Rs 386. Option (a) Rs 2,594 is the same sum COMPOUNDED forward instead of discounted back — the deliberate trap. Remember 1.1¹⁰ ≈ 2.594, one of the few powers worth carrying in your head. Discounting always makes the number smaller; if your answer is bigger than the face value, you have inverted the formula.
Source: Sep 2015
📖 §7.3.2 Return on investment (ROI)
84. The cost of replacement of inefficient compressor with an energy efficient compressor in a plant was Rs 50 lakhs. The net annual cash flow is Rs 12.5 lakhs. The return on investment is
15%
20%
25%
19.35%
Answer: C) 25%
Working: ROI = net annual cash flow / capital cost × 100 = 12.5/50 × 100 = 25%. ROI is the reciprocal of simple payback expressed as a percentage — payback here is 4 years, and 1/4 = 25% — use that as an instant cross-check. Option (d) 19.35% is what you get if you wrongly add the investment into the denominator; ignore it.
Source: Sep 2015
📖 §7.4 Cash flow — capital investment considerations
85. Costs associated with the design, planning, installation and commissioning of a project are
variable costs
capital costs
salvage value
none of the above
Answer: B) capital costs
The book names four elements of any capital-investment decision: capital cost, net operating cash inflows, economic life and salvage value. Design, planning, installation and commissioning all fall in the first bucket because they are one-time and precede operation. Variable costs recur with output; salvage value is an inflow at the END of life. Hook: if it is spent once, before the plant runs, it is capital.
Source: Sep 2015
📖 §7.3.1 Simple payback period — Example 7.1
86. A waste heat recovery system costs Rs. 54 lakhs and Rs. 2 lakhs per year to operate and maintain. If the annual savings is Rs. 20 lakhs, the payback period will be
8 years
2.7 years
3 years
10 years
Answer: C) 3 years
The whole point of the question is the word NET: annual net saving = 20 − 2 = Rs 18 lakh, so payback = 54/18 = 3 years. Option (b) 2.7 years is exactly what you get by forgetting to subtract the O&M cost — that is the marked wrong answer. Rule to write once and use always: simple payback = capital cost / (annual savings − annual operating & maintenance cost).
Source: Sep 2015
📖 §7.3.5 Internal rate of return (IRR) method
87. The internal rate of return is the discount rate for which the NPV is
positive
zero
negative
less than 1
Answer: B) zero
IRR is defined as the break-even discount rate — the rate at which discounted inflows exactly equal the capital outlay, so NPV = 0. Practical use: compare IRR with the cost of capital; above it the project earns more than the money costs, below it the project destroys value. Hook: NPV = 0 is the finish line; IRR is the speed you had to run to reach it.
Source: Sep 2017
📖 §7.3.2 Return on investment (ROI)
88. The cost of replacement of inefficient chiller with an energy efficient chiller in a plant was Rs. 10 lakh .The net annual cash flow is Rs 2.50 lakh .The return on investment is:
18%
20%
15%
none of the above
Answer: D) none of the above
Working: ROI = 2.50/10 × 100 = 25%, and 25% is deliberately absent from the option list — hence 'none of the above'. Do the arithmetic before you scan the options; candidates who see 20% and assume a rounding error lose the mark. Cross-check: payback = 10/2.5 = 4 years, and 1/4 = 25%.
Source: Sep 2017
📖 §7.5 Sensitivity and risk analysis
89. In project financing,sensitivity analysis is applied because
almost all the cash flow methods involve uncertainty
of the need to assess how sensitive the project to changes in input parameters
what if one or more factors are different from what is predicted
all the above situation
Answer: D) all the above situation
All three statements are the book's own justification: cash flows rest on assumptions, management needs to know how sensitive the outcome is to each input, and the technique answers exactly the 'what if' question. Method in one line: vary one input at a time (energy price, savings, capital cost, project life) and re-work NPV/IRR to see which variable moves the answer most. When every option is a valid reason, 'all of the above' is nearly always the intended key.
Source: Sep 2017
📖 §7.3.2 Return on investment (ROI)
90. The cost of retrofitting a humidification system with an energy efficient one costs Rs. 20 lakhs. The net annual cash flow is Rs. 5 lakhs. The return on investment is ________.
18%
25%
15%
33.33%
Answer: B) 25%
Working: 5/20 × 100 = 25%. Option (d) 33.33% comes from dividing by the net saving instead of the capital, and 15%/18% are pure noise. ROI ignores both the time value of money and the project life, which is precisely why the book insists you never rank projects on ROI alone.
Source: Sep 2019
📖 §7.3.3 Time value of money / §7.3.4 NPV
91. The discount rate is required to be known for determining _________.
NPV
IRR
payback period
all of the above
Answer: A) NPV
The discount rate is an INPUT to NPV — you cannot start the calculation without it. For IRR the discount rate is the OUTPUT, and simple payback ignores discounting altogether. That single distinction is worth memorising because the same idea is asked as 'which technique accounts for the time value of money' (answer: NPV and IRR). Trap: option (d) 'all of the above' looks safe but is wrong for exactly the two reasons above.
Source: Sep 2019
📖 §7.3.2 Return on investment (ROI)
92. Return on investment (ROI) is
initial investment/annual return
annual cost/capital cost
annual net cash flow/capital cost
none of the above
Answer: C) Annual net cash flow / capital cost (expressed as a percentage). ROI expresses the annual net return as a percentage of the capital invested. Answer key printed in the question paper.
The word to underline in the definition is NET — the numerator is the annual cash flow after operating and maintenance costs have been deducted, not the gross saving. Option (a) is payback upside-down, which is why it looks plausible. Relation worth carrying: ROI (%) = 100 / simple payback in years.
Source: Mar 2021
📖 §7.3.5 Internal rate of return (IRR) method
93. The internal rate of return is the discount rate for which the NPV is
Always positive
Always negative
negative or positive
None of the above
Answer: D) None of the above. By definition the IRR is the discount rate at which the NPV is exactly ZERO - it is neither always positive, always negative, nor 'negative or positive'. Derived - the question paper carries no printed answer key for Section-I.
The option set is a trap built on wording: IRR is the rate at which NPV is exactly ZERO, and since 'zero' is not offered, the only correct choice is 'none of the above'. Do not soften it to 'negative or positive' — at the IRR, NPV is neither. Same fact, other papers offer 'zero' directly as an option, so read the list before answering from memory.
Source: Jul 2022
📖 §7.5 Sensitivity and risk analysis
94. Sensitivity analysis is an assessment of
Profits
Losses
Risks
All of the above
Answer: C) Risks. Sensitivity analysis re-works the project economics while varying the uncertain input assumptions (energy price, savings, investment, life) so as to assess the risk attached to the investment decision. Derived - the question paper carries no printed answer key for Section-I.
Sensitivity analysis measures how much the NPV/IRR moves when an uncertain input moves — that exposure is exactly what 'risk' means here; profits and losses are outcomes, not the thing being assessed. In practice you tabulate the project economics at, say, ±10% and ±20% on energy price, savings and capital cost and report the variable the project is most sensitive to. Hook: sensitivity answers 'what if I am wrong?'.
Source: Jul 2022
📖 §7.3.2 Return on investment (ROI)
95. The retrofitting of a variable speed drive in a plant costs Rs 2 lakh. The annual savings is Rs 0.4 lakh. The maintenance cost is Rs. 0.05 lakh/year. The return on investment is
25%
22.5%
24%
17.5%
Answer: D) 17.5%. Net annual cash flow = annual saving - annual maintenance cost = 0.40 - 0.05 = Rs 0.35 lakh. ROI = net annual cash flow / capital cost x 100 = 0.35/2 x 100 = 17.5%. Derived - the question paper carries no printed answer key for Section-I.
Working: net annual cash flow = 0.40 − 0.05 = Rs 0.35 lakh; ROI = 0.35/2 × 100 = 17.5%. Option (a) 25% is the answer you get by using the gross Rs 0.40 lakh — the exact mistake the paper is testing. Same rule as payback: strip out annual maintenance before you divide.
Source: Jul 2022
📖 §7.3.1 Simple payback period — limitations
96. Which of the following statements are true regarding simple payback period?
Considers impact of cash flow even after payback period
Takes into account the time value of money
Considers cash flow throughout the project life cycle
None of the above
Answer: D) None of the above. The simple payback period ignores the time value of money and takes no account of any cash flows occurring after the payback point - those are precisely its two well-known limitations. Derived - the question paper carries no printed answer key for Section-I.
The book lists exactly two limitations, and options (a), (b) and (c) are all of them stood on their heads: payback ignores the time value of money and ignores every cash flow after the payback point. So the only statement left standing is 'none of the above'. Its advantages, which the paper also asks elsewhere, are simplicity, no tedious calculation, and a bias towards early cash recovery — useful when liquidity is tight.
Source: Jul 2022
📖 §7.3.3 Time value of money — future value
97. If the NPV of an investment is Rs. 10000 when calculated at a discount rate of 10%, what is the future value of the investment for a period of 2 years?
12100
12000
12110
12101
Answer: A) Rs. 12,100. FV = PV x (1 + i)^n = 10,000 x (1.10)^2 = 10,000 x 1.21 = Rs. 12,100. Derived - the question paper carries no printed answer key for Section-I.
Working: FV = PV × (1+i)^n = 10,000 × 1.1² = 10,000 × 1.21 = Rs 12,100. Compounding and discounting are the same equation read in opposite directions — FV multiplies by (1+i)^n, PV divides by it. Options 12,110 and 12,101 exist only to punish careless arithmetic; 1.1² is exactly 1.21, no rounding involved.
98. Select the wrong statement for financial analysis
Simple Payback is a measure of how long it will be before the investment makes money
Return on Investment (ROI) and Internal Rate of Return (IRR) enable comparison with other investment options
Net present value (NPV) is the difference between the present value of cash inflows and the present value of cash outflows over a period of time
Depreciation and payback are two deciding factors about the time value of money.
Answer: D) Statement (d) is wrong. Simple payback specifically IGNORES the time value of money, and depreciation is an accounting charge, not a discounting concept. The techniques that account for the time value of money are NPV and IRR. Statements (a), (b) and (c) are correct. Derived - the question paper carries no printed answer key for Section-I.
Depreciation is an accounting charge that spreads an asset's cost over its life and delivers a TAX benefit; it has nothing to do with discounting, and payback explicitly ignores the time value of money — so pairing the two as 'deciding factors about the time value of money' is doubly wrong. The only two techniques that handle the time value of money are NPV and IRR. In 'select the wrong statement' questions, verify each option separately rather than hunting for the one that feels odd.
Source: Mar 2023
📖 §7.3.3 Time value of money; §7.3.4 NPV; §7.3.5 IRR
99. Which techniques takes care of time value of money in evaluation
Payback Period
IRR
NPV
Both B and C
Answer: D) Both B and C - IRR and NPV. Both discount future cash flows back to present value and so account for the time value of money; the simple payback period does not. Correct option is marked in bold in the original question paper.
Both NPV and IRR discount future cash flows to today's rupees; simple payback and ROI do not, which is the book's headline distinction between 'simple' and 'discounted' techniques. If an option offers only one of NPV/IRR, look for a 'both' option before committing. Hook: discounting is the family trait NPV and IRR share.
Source: Sep 2024
📖 §7.5 Sensitivity and risk analysis — micro vs macro factors
100. Which of the following macro factors is used in the sensitivity analysis of project finance
Change in Tax rate
Change in O & M Cost
Change in Debt : equity Ratio
Change in forms of Financing
Answer: A) Change in tax rate. A MACRO (external, economy-level) factor is one outside the project's control - tax rates, interest rates, inflation, energy prices. O&M cost, debt:equity ratio and the form of financing are project-specific (micro) variables decided by the promoter. Correct option is marked in bold in the original question paper.
Macro factors sit outside the project and outside the company's control: tax rates, interest rates, inflation, energy prices, exchange rates. Micro factors are the ones the project team decides — O&M cost, debt:equity mix, form of financing, technology choice. Every distractor here is a financing or operating decision the company itself makes, which is what marks them as micro. Hook: if you can negotiate it, it is micro; if the government or the market sets it, it is macro.
Source: Sep 2024
📖 §7.3.6 Comparison of NPV and IRR
101. Two projects: X (IRR = 40%, NPV = Rs 50,000) and Y (IRR = 30%, NPV = Rs 1,20,000) having same life, no finance limit. Choose the best project.
X
Y
Cannot decide
Question invalid
Answer: B) Project Y. When there is no capital rationing and the projects have the same life, NPV is the correct criterion because it measures the absolute value added. Y creates Rs 1,20,000 of value against Rs 50,000 for X, even though X shows a higher percentage return. Correct option is marked in bold in the original question paper.
With no capital rationing and equal lives, NPV is the deciding criterion because it measures rupees of value created, while IRR only measures the rate per rupee invested. A small project can post a spectacular IRR and still add little value — that is the standard 'scale problem' with IRR. Only when funds are limited does the percentage return become the ranking measure; say which assumption you are using and the mark is safe.
Source: Sep 2025
📖 §7.3.2 Return on investment (ROI)
102. ROI for an investment of Rs 1,00,000 with an annual return of Rs 20,000 per year is _______
1%
10%
20%
200%
Answer: C) 20%. ROI = annual net cash flow / capital cost x 100 = 20,000/1,00,000 x 100 = 20%. Correct option is marked in bold in the original question paper.
Working: 20,000/1,00,000 × 100 = 20%. Payback is 5 years, and 100/5 = 20% — the reciprocal check again. Option (d) 200% is a decimal-point trap; option (b) 10% halves the return for no reason. Make it a habit to state ROI as a percentage per year, since the figure is meaningless without the time unit.
Source: Sep 2025
Short questions (5 marks) — 70
📖 §7.3 Financial Analysis Techniques — Payback Period
1. What are the limitations of the (simple) payback period?
Model answer: 1) It ignores the time value of money — cash inflows in different years are simply added without discounting, violating the principle that cash flows at different times can be combined only after compounding/discounting. 2) It does not consider savings accrued after the payback period has finished, so it favours projects with large early cash inflows and discriminates against projects with substantial inflows in later years (even if more profitable overall). 3) It gives no measure of overall profitability or return on the investment.
'Simple' = ignores time value of money; blind to cash flows after payback.
Source: Guidebook
📖 §7.3 Financial Analysis Techniques — Return on Investment (ROI)
2. What are the limitations of the ROI method?
Model answer: 1) It does not take into account the time value of money. 2) It does not account for the variable nature of annual net cash inflows — it assumes a steady annual return. For example, a 25% ROI would be economically valid only if the investment yields that fixed amount every year in perpetuity, which is not a realistic condition.
ROI = annual return as % of capital, but ignores time value and assumes constant returns.
Source: Guidebook
📖 §7.3 Comparison between Net Present Value and Internal Rate of Return
3. Compare the NPV and IRR methods of financial analysis.
Model answer: In the NPV calculation, the discount rate (cost of capital) is assumed known and the NPV is computed. In the IRR calculation, the NPV is set equal to zero and the discount rate (the IRR) that satisfies this condition is determined. The NPV method is essentially a comparison tool that lets a number of different projects be compared, while the IRR method is designed to assess whether or not a single project will achieve a target rate of return. Both take into account the time value of money and consider the cash flow stream over the entire project life.
NPV = assume rate, compare projects; IRR = set NPV=0, test a single project's return.
Source: Guidebook
📖 §7.7 Energy Performance Contracting and Role of ESCOs
4. Explain briefly the operation of an ESCO.
Model answer: ESCOs are companies that provide a complete energy project service — from assessment to design to construction/installation, along with engineering and project management services, and financing. The ESCO purchases, installs and maintains the equipment, and crucially is paid based on the performance of the installed equipment (payment-on-performance): only after the equipment actually reduces expenses does the contractor get paid. This removes the incentive to cut corners and gives the client energy savings with little up-front money. The ESCO offers contracts as fixed fee, shared savings or guaranteed savings, and the amount of risk assigned to the ESCO is directly related to the percent savings shared with it.
Complete energy service + financing; paid only on verified performance.
Source: Guidebook
📖 §7.3 Simple Payback — worked short question S-1 (CFL retrofit)
5. 100 fused 60 W incandescent lamps are replaced by 100 nos. 12 W CFLs (instead of new 60 W lamps), for 4000 h/yr. Find (i) the annual reduction in electricity cost if energy charge is Rs.4/kWh and demand charge is Rs.250/kVA/month, and (ii) the simple payback if an ILB costs Rs.10 and a CFL costs Rs.100 (lives 1000 h and 4000 h).
Model answer: Connected-load reduction = 100 × (60 − 12) = 4800 W = 4.8 kW. (i) Energy saved = 4.8 × 4000 = 19,200 kWh → energy cost saving = 19,200 × 4 = Rs.76,800/yr. Demand saving = 4.8 kVA × 250 × 12 = Rs.14,400/yr. Total annual reduction ≈ Rs.91,200/yr. (ii) Over 4000 h one CFL (life 4000 h) replaces four ILBs (life 1000 h each); incremental cost per fitting = 100 − 4×10 = Rs.60; for 100 fittings = Rs.6,000. Simple payback = 6,000 / 91,200 ≈ 0.066 yr (≈ 24 days).
6. A firm invests Rs.10 lakh at the start of year 1 in an EE project and expects an IRR of at least 26% on a constant annual net cash flow of Rs.2 lakh over 10 years. Will the project meet the firm's expectation?
Model answer: At the required 26%, the present value of Rs.2 lakh/yr for 10 years (sum of 26% PV factors ≈ 3.465) is about 2 × 3.465 = Rs.6.93 lakh, which is less than the Rs.10 lakh invested → NPV is negative at 26%. The actual IRR (rate making NPV = 0) is far lower (cash flows total only Rs.20 lakh over 10 years on a Rs.10 lakh outlay), so the project does NOT meet the firm's 26% expectation.
PV of inflows at 26% < investment → IRR below 26% → expectation not met.
Source: Guidebook
📖 §7.3 NPV — retrofit appraisal
7. An energy retrofit costs Rs.1,00,000 and yields 6000 kWh/yr at Rs.3/kWh plus Rs.3800/yr demand savings plus Rs.2000/yr maintenance savings, for a 10-year life with no rate change. Calculate the NPV at a 12% discount rate.
Model answer: Annual net saving = energy 6000×3 = 18,000 + demand 3,800 + maintenance 2,000 = Rs.23,800/yr. Sum of 12% PV factors for 10 years ≈ 5.650. PV of savings = 23,800 × 5.650 ≈ Rs.1,34,470. NPV = 1,34,470 − 1,00,000 ≈ +Rs.34,470. NPV > 0, so the upgrade is financially attractive.
Add all annual savings, multiply by Σ PV factors, subtract capital.
Source: Guidebook
📖 §7.3 IRR — Limitations / NPV vs IRR
8. Explain why a project with a high IRR is not necessarily more attractive than a project with lower IRR.
Model answer: The IRR figure cannot distinguish between lending and borrowing, so a high IRR need not be a desirable feature. NPV, by contrast, represents the absolute increase in company/shareholder wealth. A project may have a very high IRR but low NPV, while another has a lower IRR but a much higher NPV; in that case the higher-NPV project should be selected. Hence a high IRR alone does not make a project more attractive — NPV is the better selection criterion when financing is available.
IRR is a % (can't tell lending from borrowing); NPV measures absolute value added.
Source: BEE Book
📖 §7.3 NPV — decision rule (numerical)
9. An industry invests Rs.5,00,000 in an energy-saving project with cash flows Year 1 Rs.2,00,000, Year 2 Rs.3,00,000, Year 3 Rs.2,00,000. Required return 10%. Evaluate the NPV and comment on feasibility.
Model answer: NPV = −5,00,000 + 2,00,000/1.10 + 3,00,000/(1.10)² + 2,00,000/(1.10)³ = −5,00,000 + 1,81,818 + 2,47,934 + 1,50,263 = +Rs.80,015. Since NPV is positive, the project is viable and attractive (accept).
Positive NPV → accept.
Source: 2009
📖 §7.3 IRR — max affordable investment
10. An ESCO invests in a waste-heat recovery project expected to yield Rs.10,00,000/yr for 7 years. If the ESCO expects 30% IRR, calculate the maximum investment that can be made.
Model answer: At the target IRR the investment equals the present value of the savings discounted at 30%. Sum of 30% PV factors for years 1–7 ≈ 2.8021. Investment = 10,00,000 × 2.8021 = Rs.28,02,100. The ESCO can pay up to about Rs.28.0 lakh for the heat exchanger and still keep NPV ≥ 0 (i.e. still achieve at least 30%).
Max investment = annual saving × Σ PV factors at required IRR.
Source: BEE Book
📖 §7.3 NPV — feasibility (numerical)
11. A VFD for a fan needs Rs.3 lakh investment; cash flows at end of years 1, 2, 3 are Rs.1.2 lakh, Rs.1.5 lakh, Rs.1.5 lakh. Calculate NPV at 10% and state whether the project is feasible.
Model answer: NPV = −3,00,000 + 1,20,000/1.10 + 1,50,000/(1.10)² + 1,50,000/(1.10)³ = −3,00,000 + 1,09,090 + 1,23,967 + 1,12,697 = +Rs.45,754. Since NPV is positive, the VFD investment is feasible.
Positive NPV → feasible.
Source: 2023
📖 §7.3 NPV — staggered investment (numerical)
12. Calculate NPV over 4 years for a project with Rs.70,000 invested at the start of year 1 and another Rs.70,000 at the start of year 2, with fuel-cost savings of Rs.65,000 in year 2 and Rs.60,000 each in years 3 and 4. Discount rate 12%.
Model answer: NPV = −70,000 − 70,000/1.12 + 65,000/(1.12)² + 60,000/(1.12)³ + 60,000/(1.12)⁴ = −70,000 − 62,500 + 51,818 + 42,707 + 38,131 ≈ +Rs.156. NPV is marginally positive, so the project is just barely feasible.
Second outlay is discounted one year; barely positive NPV.
Source: 2022
📖 §7.4 Cash Flow + §7.3 NPV (with salvage value)
13. An energy-efficient air compressor costs Rs.6,00,000, saves Rs.1,80,000/yr for 3 years, with annual maintenance of Rs.10,000 from year 2 onward, salvage Rs.50,000 at end of year 3, discount rate 10%. Find (a) net annual cash flow from year 2, (b) NPV, (c) economic acceptability.
Model answer: (a) Net cash flow from year 2 = 1,80,000 − 10,000 = Rs.1,70,000. (b) PV: Yr0 −6,00,000; Yr1 1,80,000×0.909 = 1,63,636; Yr2 1,70,000×0.826 = 1,40,420; Yr3 (1,70,000+50,000)×0.751 = 2,20,000×0.751 = 1,65,220. NPV = (1,63,636+1,40,420+1,65,220) − 6,00,000 = −Rs.1,30,724. (c) NPV is negative, so over 3 years at 10% the project does not recover its cost and is not economically acceptable.
Add salvage to final-year inflow; negative NPV → reject.
Source: 2025
📖 §7.3 IRR — max investment (numerical)
14. Calculate the investment of a project having IRR 16% with annual savings of Rs.15,000, Rs.18,000 and Rs.20,000 at the end of years 1, 2 and 3 respectively.
Model answer: At the IRR the investment equals the PV of savings discounted at 16%: Investment = 15,000×0.862 + 18,000×0.743 + 20,000×0.641 = 12,930 + 13,374 + 12,820 = Rs.39,124 (≈ Rs.39,121).
Investment = Σ(saving × 16% PV factor).
Source: 2024
📖 §7.3 NPV Method — Example 7.4
15. An energy-saving project costs Rs.30,000 and yields net savings of Rs.6,000/yr for 10 years. At an 8% discount rate, calculate the NPV and state whether to accept. (8% PV factors yrs 1–10: 0.926, 0.857, 0.794, 0.735, 0.681, 0.630, 0.583, 0.540, 0.500, 0.463.)
Model answer: Sum of 8% PV factors over 10 years = 6.709. PV of savings = 6,000 × 6.709 = Rs.40,254. NPV = 40,254 − 30,000 = +Rs.10,254. Since NPV > 0, ACCEPT the project. (In the guidebook the comparison Project 2 gives +Rs.10,867, so the higher-NPV Project 2 is preferred.)
Σ(CF × factor) − investment; higher NPV wins when comparing.
Source: Guidebook
📖 §7.3 IRR Method — Example 7.5 (interpolation)
16. A project needs Rs.20,000 and gives cash flows of Rs.6,000, 5,500, 5,000, 4,500, 4,000, 4,000 over years 1–6. Trial NPVs are +Rs.495 at 12% and −Rs.65 at 13%. Estimate the IRR and state whether it is acceptable if the cost of capital is 8%.
Model answer: IRR = r_low + NPV_low × (r_high − r_low) / (NPV_low − NPV_high) = 12 + 495 × (13 − 12) / (495 − (−65)) = 12 + 495/560 = 12.88%. Since IRR (12.88%) > cost of capital (8%), the investment is sound — accept.
Interpolate between a small +ve and small −ve NPV; IRR > k → accept.
Source: Guidebook
📖 Book-1 §7.3 Payback Period — definition and equation
17. Define the simple payback period and state its formula.
Model answer: The simple payback period is the time (number of years) required to recover the initial investment (capital cost), considering only the annual net savings (yearly benefits − yearly costs). Formula: Simple Payback period = Capital cost / Annual net savings. The word 'simple' denotes that the time value of money is NOT considered. The shorter the payback, the more attractive the project; the maximum permissible payback is a matter of company choice.
Confirmed vs Book-1 §7.3 — Simple Payback = Capital cost / Annual net savings; "annual net savings is the cost savings achieved after all the operational costs have been met". The prefix ‘simple’ denotes that time value of money is NOT considered.
Source: AI-practice
📖 Book-1 §7.3 Simple Payback Period — Example 7.1
18. A cogeneration system reduces a company's annual energy bill by Rs.23 lakh. Capital cost is Rs.90 lakh and annual maintenance/operating cost is Rs.5 lakh. What is the payback period?
Model answer: Annual net savings = gross savings − operating cost = 23 − 5 = Rs.18 lakh. Simple payback = Capital cost / Annual net savings = 90 / 18 = 5 years.
Confirmed vs Book-1 §7.3 Example 7.1 — 90/(23−5) = 5 years. Subtract the Rs.5 lakh O&M from the Rs.23 lakh gross saving BEFORE dividing.
Source: AI-practice
📖 Book-1 §7.3 Return on Investment (ROI)
19. Define Return on Investment (ROI), give its formula, and state its relationship to payback period.
Model answer: ROI expresses the annual return expected from a project as a percentage of the capital cost (initial investment): ROI = (Annual net cash flow / Capital cost) × 100. ROI is the inverse of the payback period. For a project to be attractive, ROI must always be higher than the cost of money (interest rate); the greater the ROI, the better the investment. ROI does not require similar project life or capital cost when comparing projects.
Confirmed vs Book-1 §7.3 — ROI = (annual net cash flow / capital cost) × 100, and "ROI is an inverse of payback period". ROI must exceed the cost of money; it needs no equality of project life or capital cost for comparison.
Source: AI-practice
📖 Book-1 §7.3 ROI — Example 7.3
20. An outlay of Rs.1,00,000 for equipment provides an after-tax cash flow of Rs.25,000/yr over six years without significant fluctuation. What is the ROI?
Model answer: ROI = (Average annual operating cash flow / Net investment) × 100 = (25,000 / 1,00,000) × 100 = 25%. (Correspondingly, the payback period = inverse = 4 years.)
Confirmed vs Book-1 §7.3 Example 7.3 — ROI = 25,000/1,00,000 × 100 = 25%; payback = 1/ROI = 4 years.
Source: AI-practice
📖 Book-1 §7.3 Payback Period — Advantages
21. State the advantages of the simple payback period as an appraisal method.
Model answer: 1) It is simple, both in concept and application, and does not require tedious calculations — a shorter payback generally indicates a more attractive investment. 2) It favours projects that generate substantial cash inflows in the earlier years and discriminates against projects whose substantial inflows come only in later years (useful where quick capital recovery matters).
Confirmed vs Book-1 §7.3 (Payback — Advantages) — simple in concept and application with no tedious calculations, and it favours projects with substantial early cash inflows.
Source: AI-practice
📖 Book-1 §7.3 Time Value of Money / NPV Method (compounding vs discounting)
22. What is the time value of money? Differentiate between compounding and discounting.
Model answer: Time value of money means the value of money changes with time, so cash flows occurring at different times must be equated to a common basis before they can be compared or added. Compounding determines the FUTURE value of present cash flows (present → future), e.g. Rs.100 at 10% becomes Rs.110 in one year. Discounting is the opposite process and determines the PRESENT value of future cash flows (future → present), e.g. Rs.100 received in one year is worth only Rs.90.91 today at 10%. The present-value (discounting) concept is the method used to relate these various cash flows.
Confirmed vs Book-1 §7.3 — "Compounding determines the future value of present cash flows, whereas discounting determines the present value of future cash flows." The book’s own example: Rs.100 at 10% → Rs.110 in a year; Rs.100 in a year is worth Rs.90.91 today.
Source: AI-practice
📖 Book-1 §7.3 Time Value of Money — FV/PV relationship
23. Write the equations relating future value and present value of a cash flow, defining each variable.
Model answer: FV = PV × (1 + i)ⁿ (compounding) and PV = FV / (1 + i)ⁿ (discounting). The PV factor (discount factor) = 1 / (1 + i)ⁿ. Where FV = future value of the cash flow, PV (NPV) = present value of the cash flow, i = interest or discount rate, and n = number of years in the future.
Confirmed vs Book-1 §7.3 — the guidebook prints FV = NPV(1+i)ⁿ, or NPV = FV/(1+i)ⁿ, where it uses the symbol NPV for the present value of the cash flow, i = interest/discount rate and n = number of years in the future.
Source: AI-practice
📖 Book-1 §7.3 Net Present Value Method — equation and decision rule
24. Define Net Present Value (NPV) and state its decision rule and formula.
Model answer: The NPV of a project is the sum of the present values of all the cash flows (capital costs and net savings) over the life of the project, discounted at an assumed discount rate k. Formula: NPV = Σ CFₜ / (1 + k)ᵗ for t = 0 to n, where costs/outflows are negative and savings/inflows positive (capital investment at t=0 is negative). Decision rule: accept the project if NPV is positive and reject if NPV is negative; a zero NPV is value-neutral. The higher the NPV, the more attractive the project. NPV considers the time value of money and the entire project life.
Confirmed vs Book-1 §7.3 — NPV = Σ CFₜ/(1+k)ᵗ (t = 0…n), costs negative and savings positive. Decision rule: "Accept the project if the net present value is positive and reject the project if the net present value is negative"; a zero NPV is value-neutral.
Source: AI-practice
📖 Book-1 §7.3 NPV Method — Advantages
25. State the advantages of the Net Present Value (NPV) method.
Model answer: 1) It takes into account the time value of money. 2) It considers the cash flow stream over the entire project life. (As a comparison tool it also directly indicates value added — a positive NPV means an economic gain, and the higher the NPV the more attractive the project.) Its credibility depends on a realistic prediction of the discount rate, which is prudently set slightly above the interest rate at which the project capital is borrowed.
Confirmed vs Book-1 §7.3 (NPV — Advantages) — it takes into account the time value of money and considers the cash flow stream over the whole project life; credibility depends on a realistic discount rate, prudently set slightly above the borrowing rate.
Source: AI-practice
📖 Book-1 §7.3 Internal Rate of Return Method
26. Define the Internal Rate of Return (IRR) and state how it is interpreted.
Model answer: The IRR of a project is the discount rate that makes its Net Present Value equal to zero (the minimum value that would make the investment worthwhile). It is found in the NPV equation by setting NPV = 0 and solving for k. If this discount rate is greater than the current interest rate (cost of capital), the investment is sound. When comparing alternatives, choose the investment with the highest rate of return. Determining IRR is an iterative process of guesses and approximations (or by using a spreadsheet IRR function).
Confirmed vs Book-1 §7.3 — IRR is the discount rate that makes NPV zero; if it exceeds the current interest rate the investment is sound, and among alternatives the highest rate of return is chosen. Determining it is an iterative process of guesses and approximations.
27. Write the interpolation formula used to estimate the IRR.
Model answer: IRR = Lower rate + [NPV at lower rate × (Higher rate − Lower rate)] / (NPV at lower rate − NPV at higher rate). The two trial rates are chosen so that one gives a small positive NPV and the other a small negative NPV (NPV brackets zero), and the IRR is then interpolated between them.
Confirmed vs Book-1 §7.3 (Example 7.5) — IRR = Lower rate + [NPV at lower rate × (Higher − Lower rate)] / (NPV at lower − NPV at higher). The book applies it as 12 + 495(13−12)/(495−(−65)) = 12.88%.
Source: AI-practice
📖 Book-1 §7.3 IRR — Advantages and Limitations
28. State the advantages and the limitation of the IRR method.
Model answer: Advantages: 1) It takes into account the time value of money. 2) It considers the cash flow stream in its entirety. 3) It makes sense to businessmen who prefer to think in terms of a rate of return and find an absolute quantity like NPV harder to work with. Limitation: the IRR figure cannot distinguish between lending and borrowing, so a high IRR need not necessarily be a desirable feature.
Confirmed vs Book-1 §7.3 — advantages: time value of money, whole cash-flow stream, and a rate of return that businessmen find easier than an absolute NPV. Limitation: "The internal rate of return figure cannot distinguish between lending and borrowing."
29. List the basic criteria used for financial investment appraisal and what each measures.
Model answer: 1) Payback period — measures how long before the investment recovers itself (helps decide the financing term). 2) NPV and Cash Flow — allow financial planning by accounting for streams of money inflow and outflow over time; provide all information needed to bring EE projects into the corporate financial system. 3) ROI and IRR — allow comparison with other investment options. Energy-efficiency investment should be judged by exactly the same criteria as any other investment; no faster/more attractive return should be demanded of it.
Confirmed vs Book-1 §7.3 — payback (how long before the investment recovers itself), NPV and cash flow (financial planning of inflow/outflow streams), and ROI and IRR (comparison with other investment options). The book stresses that no faster or more attractive return should be demanded of energy efficiency.
Source: AI-practice
📖 Book-1 §7.4 Cash Flow — Capital Investment Considerations
30. List the four elements considered in judging the attractiveness of any investment (cash-flow elements).
Model answer: 1) Initial capital cost or net investment — all costs to prepare the investment for service (purchase + installation + preparation); non-recurring. 2) Net operating cash inflows — the annual benefits/savings (revenues or savings) after tax and depreciation, summed as a single end-of-year cash flow. 3) Economic life — the time span of benefits, i.e. period between initial cost and the last future cash flow. 4) Salvage value — the terminal value/revenue from disposing of the investment at the end of its useful life.
Confirmed vs Book-1 §7.4 — the four elements are initial capital cost / net investment, net operating cash inflows, economic life, and salvage value.
Source: AI-practice
📖 Book-1 §7.4 Cash Flow — Salvage value
31. What is salvage (terminal) value in investment analysis?
Model answer: The salvage or terminal value of an investment is the revenue (or expense) attributed to disposing of the investment at the end of its useful life. If there is substantial recovery of capital from eventual disposal of assets, these estimated amounts must be made part of the analysis. Such recoveries include proceeds from the sale of facilities and equipment (beyond minor scrap value) as well as the release of any working capital associated with the investment.
Confirmed vs Book-1 §7.4 — salvage (terminal) value is the revenue or expense of disposing of the investment at the end of its useful life, including sale proceeds beyond minor scrap value and the release of working capital.
32. What is a cash-flow diagram and what are the conventions/rules for drawing one?
Model answer: A cash-flow diagram is a convenient graphical display of the revenues (savings) and costs of an investment along a time axis, which makes the timing of cash flows clear and improves correct application of time-value-of-money concepts. Rules/convention: the horizontal axis is divided into time periods (usually years); arrows always point away from the time axis; upward arrows = cash inflow (income/savings, +) and downward arrows = cash outflow (costs/expenditure, −); arrows occurring in the same year can be summed. A good diagram should be complete, accurate and legible.
Confirmed vs Book-1 §7.4 (Figure 7.2) — arrows always point away from the time axis; up = income, down = expenses; arrows in the same year can be summed. A good diagram is complete, accurate and legible.
Source: AI-practice
📖 Book-1 §7.5 Sensitivity and Risk Analysis
33. What is sensitivity analysis and why is it carried out?
Model answer: Sensitivity analysis is an assessment of risk. Because many project cash flows (capital cost, energy savings, maintenance, inflation, project life) are based on uncertain estimates, sensitivity analysis tests how sensitive the project's feasibility is to changes in the input parameters — how much a factor would have to vary before the project becomes unviable, and the probability of that happening. It is recommended especially for marginal/borderline projects and projects close to the cut-off rate. It identifies uncertain parameters to which the NPV/IRR decision is sensitive (switching values), leading to improved project design with mitigation against major sources of uncertainty.
Confirmed vs Book-1 §7.5 — "Sensitivity analysis is an assessment of risk", recommended particularly where feasibility is marginal, testing how much a parameter must vary before the project becomes unviable and identifying switching values.
Source: AI-practice
📖 §7.5 Sensitivity Analysis — micro vs macro factors
34. In financial management, what are micro and macro factors? List three of each that influence sensitivity analysis.
Model answer: Micro factors are variables related to the project that the firm CAN influence/change: e.g. operating expenses, capital structure, cost of debt/equity, changing the form of finance (e.g. leasing), changing the project life. Macro factors are macro-economic variables affecting the whole industry that the firm's management CANNOT change: e.g. changes in interest rates, changes in tax rates, changes in accounting standards / depreciation methods and rates, government subsidies, employment/salary trends, environmental & safety regulations, energy price changes, technology changes.
35. List the conventional financing options for capital investment given in the guidebook.
Model answer: The various conventional financing options are: 1) Debt financing, 2) Equity financing, 3) Retained earnings, 4) Capital lease, 5) True lease, and 6) Performance contracting. Capital investment requires a source of funds; for large companies multiple sources may be employed, and the process of obtaining the funds is called financing.
Confirmed vs Book-1 §7.6 — the conventional financing options listed are debt financing, equity financing, retained earnings, capital lease, true lease and performance contracting.
Source: AI-practice
📖 §7.6 Financing Options — Debt vs Equity
36. Differentiate debt financing from equity financing in terms of ownership, cost and tax treatment.
Model answer: Debt financing: the company borrows money (loans/bonds) to be repaid later with interest; the company OWNS the equipment (good for long-term use), interest payments are tax-deductible, the cost of capital is relatively easy to calculate, but the company takes ALL the risk and must install and manage the project. Equity financing: the lender acquires an ownership (equity) position (stocks) and shares in the organization's financial success; its cost of capital is HIGHER than debt (partly because dividends are NOT tax-deductible, unlike interest).
Debt: own + tax-deductible interest + all risk; Equity: shared ownership, costlier, no tax deduction.
37. What are retained earnings as a financing option, and what cost of capital applies to them?
Model answer: Retained earnings are the accumulation of annual earnings surpluses that a company retains within the company rather than paying out to stockholders as dividends. Although held by the company, they truly belong to the stockholders, and hence the same cost of capital as for stock (equity) is applied to them. They are one of the two primary sources of equity financing (stocks and retained earnings).
Confirmed vs Book-1 §7.6 — retained earnings are accumulated annual surpluses kept in the company; "although these earnings are held by the company, they truly belong to the stockholders and hence the same cost of capital for stock is applied".
Source: AI-practice
📖 Book-1 §7.6 Financing Options — Capital lease and True lease
38. Differentiate a capital lease from a true lease, and state why a true lease offers no depreciation benefit.
Model answer: A capital lease allows a lower cost of capital with third-party participation and is a mid-way option between pure debt and pure equity financing (it carries partial ownership characteristics). A true lease allows use of the equipment WITHOUT ownership risks, offers reduced risk of poor performance/service/equipment obsolescence, and is particularly suitable for short-term use; its lease payments are tax-deductible. Because under a true lease ownership never occurs (not even at the end of the lease period), NO depreciation tax benefits are available — only the owner of an asset can claim depreciation.
Confirmed vs Book-1 §7.6 — capital lease is "a mid-way between pure debt and pure equity financing"; the true lease gives use without ownership risks, is suited to short-term use, and "no depreciation tax benefits are available and ownership does not occur even at the end of lease period".
Source: AI-practice
📖 Book-1 §7.6 Financing Options — Debt financing
39. Write short notes on debt financing.
Model answer: Debt financing involves borrowing and using money that is to be repaid later, with interest paid to the lending party for the privilege of using it. The two primary sources of debt capital are loans and bonds (e.g. car loans, mortgage loans). The company owns the equipment, so it suits long-term use. The cost of capital is relatively easy to calculate since interest rates and repayment schedules are clearly documented. A key benefit is that interest payments on debt capital are tax-deductible; however, the company takes all the risk and must install and manage the project itself.
Confirmed vs Book-1 §7.6 — debt financing is borrowing repaid with interest, from loans and bonds; the company owns the equipment (good for long-term use), interest payments are tax deductible, but the company takes all the risk and must install and manage the project.
Source: AI-practice
📖 Book-1 §7.7 Energy Performance Contracting and Role of ESCOs
40. What is an ESCO and what is energy performance contracting?
Model answer: An ESCO (Energy Service Company) is a company that provides a complete energy project service — from assessment to design to construction/installation, along with engineering and project management services, and financing. Energy performance contracting is a unique arrangement allowing industry to make energy-efficiency improvements with very little up-front money: the contractor (usually an ESCO) purchases, installs and maintains the equipment and is paid based on the performance of the installed equipment — only after the equipment actually reduces expenses does the contractor get paid. This payment-on-performance removes the incentive to cut corners and usually entails a facility-wide scope of work.
Confirmed vs Book-1 §7.7 — ESCOs "provide a complete energy project service, from assessment to design to construction or installation, along with engineering and project management services, and financing"; under performance contracting the contractor is paid only after the installed equipment actually reduces expenses.
Source: AI-practice
📖 Book-1 §7.7 Types of Performance Contracting
41. List and explain the three common types of performance contract offered by ESCOs.
Model answer: 1) Fixed fee — the ESCO conducts an audit, designs the project and either helps implement it or simply advises, for a fixed lump-sum fee; the ESCO bears the least risk because its fee does not depend on achieved savings. 2) Shared savings — the ESCO designs, finances and implements the project, verifies the energy savings, and shares an agreed percentage of the actual savings with the customer over a fixed period (more saved → higher revenue to both). 3) Guaranteed savings — the ESCO designs and implements the project but does NOT finance it (though it may facilitate financing), and guarantees the energy savings will be sufficient to cover debt-service payments. A combination of part-fixed-fee and part-shared-savings is also practised.
Confirmed vs Book-1 §7.7 — fixed fee (lump sum; ESCO bears less risk), shared savings (ESCO designs, FINANCES, implements and shares an agreed % of actual savings), guaranteed savings (ESCO does NOT finance but guarantees savings cover debt service). A part-fixed / part-shared combination is also practised.
Source: AI-practice
📖 Book-1 §7.7 Types of Performance Contracting; Ch-7 Objective Q10
42. Which financing arrangement is NOT a type of performance contract, and what are the actual performance-contract types?
Model answer: Hire purchase is NOT a type of performance contract. The three recognised performance-contract types offered by ESCOs are fixed fee, shared savings and guaranteed savings. Hire purchase is simply an instalment-purchase financing arrangement and does not link payment to the verified energy performance of the installed equipment, so it does not qualify as a performance contract.
Confirmed vs Book-1 §7.7 and Ch-7 Objective Q10 — the three performance-contract types are fixed fee, shared savings and guaranteed savings; hire purchase is not one of them because payment is not tied to verified energy performance.
43. What are the drawbacks (cons) of performance contracting with an ESCO?
Model answer: Drawbacks include: the host must share project savings with the ESCO, and the tax benefits of depreciation and other economic benefits must be negotiated. Large contracts raise concern; dealing with an ESCO can be seen as confusing or complicated, and complex potentially-binding contracts leave more margin for error and bring legal expenses and increased administrative costs. Where the ESCO guarantees savings and absorbs shortfalls, there is a risk-management cost, and insurance may be attached at a cost. Hence it is critical to choose an ESCO with a good reputation and relevant experience.
Confirmed vs Book-1 §7.7 (Drawbacks of ESCOs / Pros & Cons box) — the host must share project savings, depreciation and other tax benefits must be negotiated, contracts are potentially binding with legal and administrative costs, and a risk-management (sometimes insurance) cost applies where savings are guaranteed.
Source: AI-practice
📖 Book-1 §7.7 Energy Performance Contracting — risk vs percent savings shared
44. How is the risk assigned to an ESCO related to the savings it shares, with an example?
Model answer: In general, the amount of risk assigned to the ESCO is directly related to the percent of savings that must be shared with the ESCO — the more risk the ESCO carries, the larger its share of savings. For example, a lighting retrofit has a high probability of producing the expected cash flows (low risk), whereas a completely new process does not have the same time-tested reliability (higher risk). If the in-house energy team cannot manage such risk, performance contracting becomes an attractive alternative, with the ESCO taking on more risk in return for a larger savings share.
Confirmed vs Book-1 §7.7 — "the amount of risk assigned to the ESCO is directly related to the percent savings that must be shared with the ESCO", illustrated by a low-risk lighting retrofit versus a completely new process without time-tested reliability.
Source: AI-practice
📖 Book-1 §7.7 Role of ESCOs — Benefits to Industry
45. State the benefits to industry of using an ESCO / performance contracting.
Model answer: Benefits include: immediate upgrade of facilities and reduced operating costs without any initial capital investment; access to the ESCO's energy-efficiency expertise; positive cash flow (most projects generate savings exceeding the guarantee); freeing up the company's own money for core business needs; improved and more energy-efficient O&M; transfer of several normal business risks to the ESCO, including guaranteed equipment performance for the life of the contract; a more comfortable, productive environment; and services paid for out of money the customer would otherwise have paid the utility for wasted energy.
Confirmed vs Book-1 §7.7 (Benefits to Industry) — immediate upgrade with no initial capital investment, access to ESCO expertise, positive cash flow, freed-up capital, better O&M, transfer of business risks including guaranteed equipment performance for the contract life, and services paid from money otherwise wasted on utilities.
Source: AI-practice
📖 Book-1 §7.7 What is Depreciation?
46. What is depreciation, and what three conditions must an asset meet to be depreciable?
Model answer: Most assets used in business decrease in value over time; tax law permits reasonable deductions from taxable income to allow for this, called depreciation allowances. To be depreciable, an asset must meet three conditions: (1) it must be held by the business for the purpose of producing income, (2) it must wear out or be consumed in the course of its use, and (3) it must have a life longer than one year.
Confirmed vs Book-1 §7.7 — depreciation allowances are reasonable deductions from taxable income; the three primary conditions are that the asset is held to produce income, wears out or is consumed in use, and has a life longer than a year.
Source: AI-practice
📖 Book-1 §7.7 What is Depreciation? (with §7.4 salvage value / economic life)
47. Write the straight-line depreciation formula and explain the depreciation tax shield.
Model answer: Straight-line depreciation = (Cost − Salvage value) / Useful life, charging an equal amount each year. Depreciation is a non-cash expense, but it is deductible from taxable income; it therefore reduces the tax payable and so improves the after-tax cash flow — this benefit is called the depreciation tax shield. Note that under a true lease the lessee does not own the asset, so NO depreciation tax benefit is available.
Confirmed vs Book-1 §7.7 / §7.4 — the guidebook defines depreciation allowances and the three depreciability conditions and supplies the terms salvage value and economic life; the straight-line method applies them as (Cost − Salvage)/Useful life. Being a non-cash deduction it cuts tax and so raises after-tax cash flow; §7.6 confirms a true lease gives no depreciation benefit.
48. What is an Investment Grade Audit (IGA) and its role in ESCO contracting?
Model answer: An investment grade audit (IGA) is the process of conducting an energy audit to identify efficiency opportunities and translating the technical findings into financial terms, so as to present the project as a bankable project capable of securing a loan. An IGA evaluation includes a description of the baseline situation, project design/basic engineering, technical analysis, project financials, baseline calculation, options for monitoring and verification, and an assessment of technical and financial risk with a risk-mitigation plan. The IGA report forms the basis of the energy performance contract between the organization and the ESCO.
Confirmed vs Book-1 §7.8 — an IGA is "the process of conducting an energy audit to identify efficiency opportunities, and translating the technical findings into financial terms to present it as a bankable project capable of securing a loan"; its evaluation covers baseline, design, technical analysis, financials, M&V options and a risk-mitigation plan.
49. State the formula used to calculate energy saved in measurement & verification (M&V) of an ESCO project, defining each term.
Model answer: Energy Saved = Baseline − Current ± Adjustment. Where: Energy saved is the energy saved over a period from project start to a set point in time; Baseline is the baseline energy consumption (e.g. in kWh); Current is the current energy consumption (from metering or utility bills); Adjustments are any positive or negative corrections needed to bring current energy use to the same set of conditions as the baseline. To get cost savings, the parties must agree how to handle energy-price fluctuations (e.g. a set price), so the result reflects only the efficiency measures, not changing energy costs.
Confirmed vs Book-1 §7.8 (Calculating savings) — Energy Saved = Baseline − Current ± Adjustment, with adjustments bringing current use to the same set of conditions as the baseline. Parties must also agree how to handle energy-price fluctuations (e.g. a set price) so the result reflects efficiency only.
Source: AI-practice
📖 Book-1 §7.2 Investment Need, Appraisal and Criteria
50. Why is financial appraisal of energy conservation projects necessary?
Model answer: Any capital investment project must be justified by a financial appraisal because management invests capital where it will obtain the greatest return, and an energy project is only one of many competing for limited funds. Management normally demands a higher rate of return from energy projects than from core profit-making investments, so energy proposals must show the likely return on the capital invested (how much it will cost and how much it will save). Costs and returns are not easily obtained — equipment loses value and needs more maintenance with age, borrowed money carries interest, and inflation affects future savings — so appraisal techniques are used to make correct, objective decisions and optimize benefits.
Confirmed vs Book-1 §7.2 — "It is the job of senior management to invest capital where it is going to obtain the greatest return" and "management normally demand higher rate of return from energy projects than core or direct profit-making investments"; appraisal techniques exist to make correct and objective decisions.
Source: AI-practice
📖 Book-1 §7.2 Investment Need, Appraisal and Criteria — projecting benefits
51. Besides energy savings, in what terms should the benefits of energy management projects be projected to senior management?
Model answer: Benefits should be projected not only as energy savings but also as: lower operational costs, a low risk/reward ratio, reduced environmental cost, improved productivity, better product quality or enhanced quality of service, and the potential to improve the company's share value. Most importantly, a systematic financial-management approach must be followed to rate the various investment options against the anticipated savings. Before investing, it should also be ensured that existing plant performs at its best, energy charges are at the lowest tariffs, the best fuels/electricity are used efficiently, and good housekeeping is practised.
Confirmed vs Book-1 §7.2 — benefits should be projected as lower operational costs, low risk/reward ratio, reduced environmental cost, improved productivity, better product quality or service, and potential to improve share value, supported by a systematic financial-management approach.
Source: AI-practice
📖 Book-1 §7.3 Payback Period — Limitations, Example 7.2
52. Using two projects A and B (both costing Rs.1,00,000), explain the key drawback of the payback period.
Model answer: Project A pays back in 3 years and Project B in 4 years, so the payback criterion prefers Project A. However, Project B has very substantial cash inflows in years 5 and 6 (e.g. Rs.50,000 and Rs.60,000) which payback completely ignores. This illustrates the drawback: the payback period does not consider savings accrued after the payback period, so it wrongly favours projects with early inflows and discriminates against more profitable projects whose large inflows come later. It also ignores the time value of money, adding cash flows without discounting.
Confirmed vs Book-1 §7.3 Example 7.2 — A pays back in 3 years and B in 4, yet B has cash inflows of Rs.50,000 and Rs.60,000 in years 5 and 6 that payback ignores. The book also notes payback adds cash inflows without suitable discounting.
53. Expand the following Chapter-7 acronyms: NPV, IRR, ROI, ESCO, IGA, EPC, M&V (PMV).
Model answer: NPV = Net Present Value; IRR = Internal Rate of Return; ROI = Return on Investment; ESCO = Energy Service Company; IGA = Investment Grade Audit; EPC = Energy Performance Contract; M&V (PMV) = Measurement and Verification (Performance Measurement and Verification).
Confirmed vs Book-1 Chapter 7 — all seven expansions appear in the chapter text (§7.3 for NPV/IRR/ROI, §7.7 for ESCO, §7.8 for EPC, IGA and measurement & verification / PMV in the case study).
Source: AI-practice
📖 Book-1 §7.3 Time Value of Money — discounting / present value concept
54. What is meant by 'discounting' or the 'present value concept', and why is it needed?
Model answer: A project involves an initial capital cost and a series of future annual costs and/or savings over its life. To assess feasibility, all these present and future cash flows must be equated to a common basis, but the value of money changes with time. The method by which cash flows occurring at different times are related is called discounting, or the present value concept — it converts future cash flows to their equivalent value today using an assumed interest (discount) rate. For example, at 10% interest Rs.100 received one year from now is worth only Rs.90.91 today.
Confirmed vs Book-1 §7.3 — "To assess project feasibility, all these present and future cash flows must be equated to a common basis. The problem with equating cash flows which occur at different times is that the value of money changes with time. The method by which these various cash flows are related is called discounting, or the present value concept."
The book’s own illustration: at 10% interest Rs.100 received one year from now is worth only Rs.90.91 today.
Discounting (future → present) is the opposite of compounding (present → future) and underpins both NPV and IRR.
Source: AI-practice
📖 Book-1 §7.3 NPV Method — choice of discount rate
55. How should the discount rate for an NPV calculation be chosen?
Model answer: The discount rate (k) used to evaluate the present value of expected future cash flows should reflect the risk of the project. The whole credibility of the NPV depends on a realistic prediction of this rate, which can often be unpredictable. As a practical rule, it is prudent to set the discount rate slightly above the interest rate at which the capital for the project is borrowed.
Confirmed vs Book-1 §7.3 — "The discount rate (k) employed for evaluating the present value of the expected future cash flows should reflect the risk of the project" and "it is prudent to set the discount rate slightly above the interest rate at which the capital for the project is borrowed".
Source: AI-practice
📖 §7.3.4 Net present value (NPV) method
56. Calculate the net present value over a period of 3 years for a project with one investment of Rs 50,000 at the beginning of the first year and a second investment of Rs 30,000 at the beginning of the second year and fuel cost savings of Rs 40,000 each in the second and third year. The discount rate is 16%.
Timing matters more than the arithmetic: an investment 'at the beginning of year 2' is an end-of-year-1 cash flow, so it is discounted once (÷1.16), not left undiscounted. Working: −50,000 − 30,000/1.16 + 40,000/1.16² + 40,000/1.16³ = −50,000 − 25,862 + 29,727 + 25,626 = −Rs 20,509. Because NPV is negative the project is rejected at 16% — always add that one-line verdict, it usually carries a mark.
Source: Oct 2011
📖 §7.3.6 Comparison of NPV and IRR
57. Briefly compare NPV and IRR method of financial analysis.
Model answer: Net Present Value: The net present value method calculates the present value of all the yearly cash flows (i.e. capital costs and net savings) incurred or accrued throughout the life of a project and summates them. Costs are represented as negative value and savings as a positive value. The sum of all the present values is known as the net present value (NPV). The higher the net present value, the more attractive the proposed project. The net present value takes into account the time value of money and it considers the cash flow stream in entire project life. Internal Rate of Return Method: By setting the net present value of an investment to zero (the minimum value that would make the investment worthwhile), the discount rate can be computed. The internal rate of return (IRR) of a project is the discount rate which makes its net present value (NPV) equal to zero. It is the discount rate in the equation 0 = CF0/(1+k)^0 + CF1/(1+k)^1 + ... + CFn/(1+k)^n = sum of CFt/(1+k)^t, where CFt = cash flow at the end of year "t", k = discount rate, n = life of the project.
Answer in pairs so the comparison is visible: NPV gives an absolute rupee gain, IRR gives a percentage return; NPV needs the discount rate supplied in advance, IRR generates its own rate; NPV can be added across projects, IRR cannot. Add the two weaknesses of IRR the examiner looks for — multiple IRRs when cash flows change sign more than once, and its bias towards small projects with high percentage returns. State the decision rule for each: accept if NPV > 0; accept if IRR > cost of capital.
Source: Oct 2011
📖 §7.3.4 Net present value (NPV) method
58. Calculate the net present value over a period of 3 years for a project with one investment of Rs 50,000 at the beginning of the first year and a second investment of Rs 30,000 at the beginning of the second year and fuel cost savings of Rs 40,000 each in the second and third year. The discount rate is 14%.
Same structure as the 16% version, only the discount rate changes: −50,000 − 30,000/1.14 + 40,000/1.14² + 40,000/1.14³ = −50,000 − 26,316 + 30,779 + 26,999 = −Rs 18,538. Notice the pattern to quote in the viva — dropping the discount rate from 16% to 14% makes the NPV less negative, because a lower rate values future savings more highly. Still negative, so still rejected.
Source: Oct 2011
📖 §7.3.1 Simple payback period (power-factor improvement)
59. An industrial plant is consuming 400 kW of power with a maximum demand of 520 kVA. The demand charge is Rs. 150/- per kVA. Determine the savings possible by improving power factor to 0.95 and payback period if investment on capacitor bank is Rs 1,50,000/-.
Model answer: Present Power Factor = 400/520 = 0.77. Present Demand Charges = 520 x 150 = Rs. 78000/-. Future Demand with higher PF = 400/0.95 = 421 kVA. Modified Demand Charges = 421 x 150 = Rs. 63150/-. Savings = 78000 - 63150 = Rs. 14850/- per month. Capacitor Investment = Rs. 1,50,000/-. Simple Payback Period = 1,50,000/14850 = 10.1 Months.
Working: present PF = 400/520 = 0.77; new kVA = 400/0.95 = 421; saving = (520 − 421) × 150 = Rs 14,850 per MONTH = Rs 1,78,200 per year. Payback = 1,50,000/1,78,200 ≈ 0.84 year ≈ 10 months. The classic mark-loser is dividing the investment by the monthly saving and reporting 'about 10 years' — always convert the saving to an annual figure before dividing. kVA = kW / power factor is the only relation you need.
Source: Aug 2013
📖 §7.3.1 Simple payback period (power-factor improvement)
60. An industrial plant is consuming 400 kW of power with a maximum demand of 520 kVA. The demand charge is Rs. 150/- per kVA. Determine the savings possible by improving power factor to 0.95 and payback period if investment on capacitor bank is Rs 1,00,000/-.
Model answer: Present Power Factor = 400/520 = 0.77. Present Demand Charges = 520 x 150 = Rs. 78000/-. Future Demand with higher PF = 400/0.95 = 421 kVA. Modified Demand Charges = 421 x 150 = Rs. 63150/-. Savings = 78000 - 63150 = Rs. 14850/- per month. Capacitor Investment = Rs. 1,00,000/-. Simple Payback Period = 1,00,000/14850 = 6.73 Months.
Identical physics, smaller capacitor bank: monthly saving Rs 14,850, annual Rs 1,78,200, payback = 1,00,000/1,78,200 ≈ 0.56 year ≈ 6.7 months. Note that improving power factor cuts the billed DEMAND (kVA), not the kW consumed — so the saving comes only from the demand charge, never from energy charges. Answer in months when the payback is under a year; it reads as a controlled answer.
Source: Aug 2013
📖 §7.3.4 Net present value (NPV) method — netting flows in a year
61. Calculate the net present value over a period of 3 years for a project with the following data. The discount rate is 12%.
Year Investment (Rs) Savings (Rs)
0 75,000
1 25,000
2 75,000
3 50,000 75,000
4 35,000
When a year has both an outgo and a saving, net them FIRST and discount the single figure: year 3 = 75,000 − 50,000 = 25,000. Working: −75,000 + 25,000/1.12 + 75,000/1.12² + 25,000/1.12³ = −75,000 + 22,321 + 59,789 + 17,794 = +Rs 24,904. Positive NPV at 12% → accept. Show the netting step explicitly; it is where the method marks sit.
Source: Sep 2015
📖 §7.3.5 Internal rate of return (IRR) — solving for the investment
62. An ESCO company is required to invest in a waste heat recovery project, which is expected to yield an annual saving of Rs.10,00,000 and the life of the equipment is 7 years. If the ESCO expects 30% IRR on this project, calculate the investment required to be made.
Model answer: The investment is the present value (PV) of the annual savings of Rs. 1,000,000 per year for 7 years discounted at 30 %:
0 = - Investment + 1000000/(1+0.3)^1 + 1000000/(1+0.3)^2 + ... + 1000000/(1+0.3)^7
or
Investment = Rs. 1,000,000/year x (P/A, 30 %, 7 years factor)
= Rs. 1,000,000/year x 2.8021
= Rs. 28,02,100
Thus the ESCO can pay Rs. 2,802,100 for the waste heat exchanger and still have a positive NPV.
At the IRR the NPV is zero, so the investment must equal the present value of the annuity: Investment = 10,00,000 × [1 − (1.3)⁻⁷]/0.30. (1.3)⁷ ≈ 6.275, so the annuity factor = (1 − 0.1594)/0.3 = 2.802, giving about Rs 28.0 lakh. Write the zero-NPV equation first — that is the marked step; the arithmetic is secondary. Sense check: at a demanding 30% IRR the ESCO can only justify roughly 2.8 years of savings as capital.
Source: Sep 2018
📖 §7.3.4 Net present value (NPV) method
63. An industry intends to invest Rs. 5,00,000 in a new energy saving project. The cash flows expected are: Year 1 : Rs.2,00,000; Year 2 : Rs.3,00,000; Year 3 : Rs.2,00,000. The expected return is 10%. Evaluate the Net Present Value and comment on the feasibility of the project?
Model answer: NPV = -500,000 + (200,000/1.10) + [300,000/(1.1)^2] + [200,000/(1.1)^3]
= -500,000 + 181,818 + 247,934 + 150,263
= Rs. 80,015
NPV is positive (Rs. 80,015); therefore the proposed investment in the new energy saving project is viable and attractive.
Working: −5,00,000 + 2,00,000/1.1 + 3,00,000/1.21 + 2,00,000/1.331 = −5,00,000 + 1,81,818 + 2,47,934 + 1,50,263 = +Rs 80,015. The decision rule is the marked line: accept when NPV > 0, reject when NPV < 0, indifferent at zero. Do not stop at the number — the question says 'comment on feasibility', which is a separate mark.
Source: Sep 2019
📖 §7.3.4 Net present value (NPV) method
64. a) Calculate the Net Present Value of a project at a discount rate of 16% with an investment of Rs. 50,000 at the beginning of the first year and savings of Rs. 15,000, Rs. 18,000 and Rs. 20,000 respectively at the end of the first, second and third year. (3 Marks) b) State whether the project is viable or not? (2 Marks)
Model answer: a) NPV = -50,000 + 15,000/1.16 + 18,000/(1.16)^2 + 20,000/(1.16)^3
= -50,000 + 12,931 + 13,377 + 12,813
= Rs. (-)10,879.
b) As the NPV is negative, the project is NOT viable at a 16% discount rate.
Working: −50,000 + 15,000/1.16 + 18,000/1.16² + 20,000/1.16³ = −50,000 + 12,931 + 13,377 + 12,813 = −Rs 10,879. Note how heavily 16% punishes the later savings — the year-3 Rs 20,000 is worth less than the year-1 Rs 15,000. That observation is the 'comment' the second part wants. Negative NPV → not viable at 16%; you may add that it would turn viable at a low enough discount rate.
Source: Mar 2021
📖 §7.7 Energy performance contracting and the role of ESCOs (Book-1)
65. a) Explain energy performance contracting and their types? (3 Marks) b) Explain the role of ESCOs in energy performance contracting? (2 Marks)
Model answer: a) Refer BEE Guidebook Book-1, Page 178 (an energy performance contract is an agreement under which the contractor's remuneration is tied to the energy savings actually achieved; the principal types are the guaranteed savings contract, the shared savings contract and the paid-from-savings/first-out contract, which differ in who arranges the finance and who bears the savings risk).
b) Refer BEE Guidebook Book-1, Page 177 (the ESCO identifies the savings opportunity, designs and engineers the measures, arranges or provides the financing, implements and commissions the project, operates and maintains it, and measures and verifies the savings, being paid out of the savings realised).
(a) An energy performance contract ties the contractor's remuneration to the energy savings actually achieved and verified, so the client pays out of the savings rather than out of capital; the three types are guaranteed savings, shared savings and first-out/paid-from-savings. (b) The ESCO's role is end-to-end and worth listing as steps: it audits and identifies the measures, designs and engineers them, arranges or provides the financing, procures and installs the equipment, commissions and operates or maintains it, and then measures and verifies the savings under an agreed M&V protocol — bearing the technical performance risk throughout. Mentioning M&V and risk transfer is what lifts this from 2 marks to full marks.
Source: Jul 2022
📖 §7.3.4 Net present value (NPV) method — staged investment
66. Calculate the Net Present Value over a period of 4 years for a project with an investment of Rs 70,000 at the beginning of the first year and another investment of Rs 70,000 at the beginning of the second year and fuel cost saving of Rs 65,000 in second year and Rs. 60,000 each in third and fourth year. The discount rate is 12%. (5 Marks)
Model answer: NPV = -70,000 - 70,000/1.12 + 65,000/(1.12)^2 + 60,000/(1.12)^3 + 60,000/(1.12)^4
= -70,000 - 62,500 + 51,818 + 42,707 + 38,131
= Rs. 156 (positive).
As the NPV is marginally positive, the project is just viable at a 12% discount rate.
The second Rs 70,000 falls at the beginning of year 2, i.e. one year away, so it is discounted once: −70,000 − 70,000/1.12 + 65,000/1.12² + 60,000/1.12³ + 60,000/1.12⁴ = −70,000 − 62,500 + 51,818 + 42,707 + 38,131 = +Rs 156. The verdict is the interesting part: an NPV of Rs 156 on a Rs 1.4 lakh outlay means the project barely clears 12% — say it is marginal, not comfortably viable. Getting the timing of the second investment wrong is the single biggest mark loss in this question.
Source: Jul 2022
📖 §7.3.4 Net present value (NPV) method
67. A VFD is to be installed for a fan. The initial investment is 3 lakh rupees and cashflow at the end of 1st, 2nd and 3rd year are 1.2 lakh, 1.5 lakh and 1.5 lakh rupees respectively. Calculate NPV at 10% discount rate and check whether this project is feasible or not. (5 Marks)
Model answer: NPV = -3,00,000 + 1,20,000/(1.10) + 1,50,000/(1.10)^2 + 1,50,000/(1.10)^3
= -3,00,000 + 1,09,090 + 1,23,967 + 1,12,697
= +Rs. 45,754
As the NPV is positive, the proposed investment in the VFD is viable / feasible.
Working: −3,00,000 + 1,20,000/1.1 + 1,50,000/1.21 + 1,50,000/1.331 = −3,00,000 + 1,09,090 + 1,23,967 + 1,12,697 = +Rs 45,754. Total undiscounted inflow is Rs 4.2 lakh against Rs 3 lakh spent, so a positive NPV at 10% is expected — use that as a sanity check before you trust your arithmetic. Close with the verdict: NPV > 0, therefore the VFD is feasible.
Source: Mar 2023
📖 §7.3.5 IRR — working backwards to the investment
68. Calculate the investment of the project having IRR of 16% and having respective annual savings of Rs 15,000, Rs. 18,000 and Rs. 20,000 at the end of the first, second and third year. (5 Marks)
Model answer: At the IRR the NPV is zero, so the investment must equal the present value of the savings discounted at 16%:
Investment = 15,000/1.16 + 18,000/(1.16)^2 + 20,000/(1.16)^3
= 12,931 + 13,377 + 12,813
= Rs. 39,121
Hence the project investment is Rs. 39,121.
At the IRR, NPV = 0, so investment = present value of the savings at 16%: 15,000/1.16 + 18,000/1.16² + 20,000/1.16³ = 12,931 + 13,377 + 12,813 = Rs 39,121. This is the same cash-flow set as the NPV question with a Rs 50,000 investment — which is exactly why that one gave a negative NPV: Rs 50,000 is well above the Rs 39,121 the flows can justify at 16%. Spotting that link is a quick way to check your own answer.
Source: Sep 2024
📖 §7.3.1 Simple payback period — motor/VFD energy audit
69. An energy audit conducted in a rubber processing unit identifies the following: A centrifugal pump (motor rating 30 kW) runs continuously for 16 hours/day, 300 days/year. Measured motor loading = 65%, Motor efficiency = 88%, with no flow control. A VFD retrofit is proposed, which is expected to reduce energy consumption by 10% due to optimized flow control. Power cost = Rs. 7.0/kWh. VFD installation cost = Rs. 1,50,000. a) Calculate the current annual energy consumption of the motor. (2 Marks) b) Estimate the expected annual energy savings from the VFD. (1 Mark) c) Calculate the annual cost saving in Rs. (1 Mark) d) Determine the simple payback period for the investment. (1 Mark)
Model answer: a) Annual energy use = (motor rating x loading / efficiency) x hours/day x days/year
= (30 x 0.65 / 0.88) x 16 x 300
= 22.159 kW x 4,800 h
= 1,06,364 kWh/year
b) Energy saved = 1,06,364 x 0.10 = 10,636.4 kWh/year
c) Annual cost saving = 10,636.4 x Rs. 7.0 = Rs. 74,454.8/year
d) Simple payback period = investment / annual net saving = 1,50,000 / 74,454.8 = 2.01 years (about 24.17 months)
Working: input power = 30 × 0.65/0.88 = 22.16 kW; annual use = 22.16 × 16 × 300 = 1,06,364 kWh; saving = 10% = 10,636 kWh → Rs 74,455/year; payback = 1,50,000/74,455 ≈ 2.0 years. The step candidates skip is dividing by motor efficiency — the shaft load is 30 × 0.65, but the ELECTRICITY drawn is that divided by 0.88. Keep the four sub-answers separately labelled (a) to (d); each carries its own mark.
Source: Sep 2025
📖 §7.3.4 NPV with staged O&M and salvage value
70. A medium-sized factory installs an energy-efficient air compressor system costing Rs. 6,00,000. An audit estimates that it will save Rs. 1,80,000 per year in energy bills for the next 3 years. Annual maintenance is expected to cost Rs. 10,000 starting from the second year onward. Assume: Discount rate (cost of capital) is 10% and salvage value at the end of the third year is Rs. 50,000. a) Calculate the net annual cash flow from Year 2 onward (2 Marks) b) Compute the Net Present Value (NPV) of the investment (2 Marks) c) Based on NPV, assess whether the project is economically acceptable (1 Mark)
Model answer: a) Annual saving = Rs. 1,80,000; annual maintenance from Year 2 = Rs. 10,000.
Net annual cash flow from Year 2 onward = 1,80,000 - 10,000 = Rs. 1,70,000.
b) Cash flow table at a 10% discount rate:
Year 0: total cash flow -6,00,000; PV factor 1.000; PV = -6,00,000
Year 1: 1,80,000; PV factor 0.909; PV = 1,63,636
Year 2: 1,70,000; PV factor 0.826; PV = 1,40,420
Year 3: 1,70,000 + 50,000 salvage = 2,20,000; PV factor 0.751; PV = 1,65,220
Total PV of inflows = 1,63,636 + 1,40,420 + 1,65,220 = Rs. 4,69,276
NPV = 4,69,276 - 6,00,000 = Rs. -1,30,724
c) The NPV is negative (Rs. -1,30,724), meaning the project will not recover its investment cost within 3 years at a 10% discount rate. Therefore the project is NOT economically acceptable under these conditions.
Year 1 keeps the full Rs 1,80,000 because maintenance starts only in year 2; years 2 and 3 net to Rs 1,70,000, and year 3 also picks up the Rs 50,000 salvage. NPV = −6,00,000 + 1,80,000/1.1 + 1,70,000/1.21 + 2,20,000/1.331 = −6,00,000 + 1,63,636 + 1,40,496 + 1,65,289 = −Rs 1,30,579 — negative, so on NPV grounds the project is NOT acceptable. Do not let a healthy-looking payback tempt you into the opposite verdict; the question explicitly says 'based on NPV'.
Source: Sep 2025
Long questions (10 marks) — 31
📖 BEE Guidebook Ch.7, Example 7.1 (p.164-165)
1. A cogeneration system installation is expected to reduce a company's annual energy bill by Rs. 23 lakhs. If the capital cost of the new cogeneration installation is Rs. 90 lakhs and the annual maintenance and operating (O&M) costs are Rs. 5 lakhs, what will be the expected simple payback period for the project? State the formula, the advantages and the limitations of the simple payback method.
Model answer: FORMULA: Simple Payback Period = Capital cost / Annual net savings, where Annual net savings = yearly benefits - yearly (operating/maintenance) costs. The prefix 'simple' denotes that the TIME VALUE OF MONEY is NOT considered.
STEP 1 - Annual net savings = gross energy saving - O&M cost = 23 - 5 = Rs. 18 lakhs/year.
STEP 2 - Simple Payback = Capital cost / Annual net savings = 90 / 18 = 5 YEARS.
DECISION: The shorter the payback, the more attractive the project; the maximum permissible payback is a matter of company policy.
ADVANTAGES: (i) simple in concept and application, no tedious calculation; (ii) favours projects giving large cash inflows in the early years.
LIMITATIONS: (i) ignores all savings accruing AFTER the payback period (discriminates against projects with large later inflows); (ii) ignores the time value of money - cash flows are simply added without discounting.
Classic trap: subtract the O&M cost from the gross saving BEFORE dividing. Net saving 18 (not 23). Answer = exactly 5 years.
Source: Year not recorded
📖 BEE Guidebook Ch.7, Example 7.2 (p.165)
2. Two projects A and B each require an investment of Rs. 1,00,000. Their annual cash inflows are: Project A - Yr1 50,000, Yr2 30,000, Yr3 20,000, Yr4 10,000, Yr5 10,000. Project B - Yr1 20,000, Yr2 20,000, Yr3 20,000, Yr4 40,000, Yr5 50,000, Yr6 60,000. Using the payback criterion, which project is selected, and explain why this exposes the main drawback of the simple payback method.
Model answer: PROJECT A - cumulative cash inflow: end Yr1 50,000; Yr2 80,000; Yr3 1,00,000 -> investment recovered exactly at end of Year 3. Payback A = 3 years.
PROJECT B - cumulative: Yr1 20,000; Yr2 40,000; Yr3 60,000; Yr4 1,00,000 -> recovered at end of Year 4. Payback B = 4 years.
DECISION BY PAYBACK: A (3 yr) is preferred over B (4 yr).
BUT total undiscounted inflows: Project A = 1,20,000 over 5 years; Project B = 2,10,000 over 6 years. Project B is clearly the more profitable project overall, yet payback rejects it because its large inflows (40,000; 50,000; 60,000) come in the LATER years.
DRAWBACK ILLUSTRATED: (i) payback ignores all cash flows occurring AFTER the payback period, so it discriminates against projects with substantial later inflows; (ii) it ignores the time value of money - inflows are added without discounting. This is why payback should be supported by NPV/IRR for final selection.
The whole point is: payback picks A but B returns far more (2.10 lakh vs 1.20 lakh). Show cumulative cash flow to prove the 3-yr vs 4-yr result.
Source: Year not recorded
📖 BEE Guidebook Ch.7, Example 7.3 (p.166)
3. An outlay of Rs. 1,00,000 for equipment is expected to provide an after-tax cash flow of Rs. 25,000 per year over a period of six years without significant annual fluctuation. What is the Return on Investment (ROI)? Define ROI, state its relation to payback, and give its advantages and limitations.
Model answer: DEFINITION: ROI expresses the annual return of a project as a percentage of the capital cost. ROI = (Annual net cash flow / Capital cost) x 100. ROI is the INVERSE of the simple payback period.
CALCULATION: ROI = (25,000 / 1,00,000) x 100 = 25%.
(Check: payback = 1,00,000 / 25,000 = 4 years; ROI = 1/4 = 25% - confirming ROI = inverse of payback.)
DECISION RULE: ROI must always exceed the cost of money (interest rate) for the project to be attractive; the higher the ROI the better. ROI does not require projects to have equal life or capital cost to be compared.
ADVANTAGES: simple, easy to calculate; being a percentage it is easy to compare with the borrowing interest rate.
LIMITATIONS: (i) ignores the time value of money; (ii) ignores the variable nature of annual cash inflows - the 25% figure is strictly valid only if Rs. 25,000/yr continued in perpetuity, which is unrealistic.
ROI = annual net cash flow / capital cost. Remember ROI = 1/payback (a very common objective). Answer = 25%.
Source: Year not recorded
📖 BEE Guidebook Ch.7, Example 7.4 (p.167-168)
4. Using the Net Present Value technique, evaluate the financial merits of the two proposed projects and state which is preferable. Discount rate = 8% for each; both have capital cost Rs. 30,000 and a 10-year life. Net annual savings (Rs.): Project 1 = 6000 every year (Yr1-10). Project 2 = Yr1 6600, Yr2 6600, Yr3 6300, Yr4 6300, Yr5 6000, Yr6 6000, Yr7 5700, Yr8 5700, Yr9 5400, Yr10 5400.
Model answer: METHOD: NPV = Sum of (CF_t x PV factor @8%) - Initial investment, where PV factor = 1/(1.08)^t. Accept if NPV > 0; when comparing, the HIGHER NPV is the better project.
PV factors @8%: Yr1 0.926, Yr2 0.857, Yr3 0.794, Yr4 0.735, Yr5 0.681, Yr6 0.630, Yr7 0.583, Yr8 0.540, Yr9 0.500, Yr10 0.463 (sum = 6.709).
PROJECT 1 (constant Rs.6000):
PV of savings = 6000 x 6.709 = 40,254.
NPV1 = 40,254 - 30,000 = +Rs. 10,254.
PROJECT 2 (table):
Yr1 6600x0.926=6112; Yr2 6600x0.857=5656; Yr3 6300x0.794=5002; Yr4 6300x0.735=4631; Yr5 6000x0.681=4086; Yr6 6000x0.630=3780; Yr7 5700x0.583=3323; Yr8 5700x0.540=3078; Yr9 5400x0.500=2700; Yr10 5400x0.463=2500.
Sum of PV = 40,867.8. NPV2 = 40,867.8 - 30,000 = +Rs. 10,867 (the guidebook prints Rs.10,867).
DECISION: Both NPVs are positive (both acceptable), but NPV2 (Rs.10,867) > NPV1 (Rs.10,254). Therefore PROJECT 2 is the preferable proposal (higher NPV).
Guaranteed 10-mark template. Lay it out as a Year|CF|DF@8%|PV table; graders reward the table. Higher NPV wins -> Project 2. Both positive so both are individually acceptable.
Source: Year not recorded
📖 BEE Guidebook Ch.7, Example 7.5 (p.169-171)
5. A proposed project requires an initial capital investment of Rs. 20,000. Cash flows: Yr1 6000, Yr2 5500, Yr3 5000, Yr4 4500, Yr5 4000, Yr6 4000. The cost of capital is 8%. Determine the Internal Rate of Return (IRR) by the interpolation method, and state whether the project is sound.
Model answer: IRR = the discount rate at which NPV = 0. Method: try discount rates until NPV brackets zero (one +ve, one -ve), then interpolate.
NPV @8% (factors 0.926,0.857,0.794,0.735,0.681,0.630):
6000x0.926 + 5500x0.857 + 5000x0.794 + 4500x0.735 + 4000x0.681 + 4000x0.630 = 5556+4713+3970+3308+2724+2520 = 22,791. NPV = 22,791-20,000 = +2,791.
NPV @12% (0.893,0.797,0.712,0.636,0.567,0.507): = 20,495 approx. NPV = +495.
NPV @16% (0.862,0.743,0.641,0.552,0.476,0.410): NPV = -1,508.
NPV @13% (0.885,0.783,0.693,0.613,0.543,0.480): NPV = -65.
NPV crosses zero between 12% (+495) and 13% (-65).
INTERPOLATION FORMULA:
IRR = Lower rate + [NPV at lower rate / (NPV at lower rate - NPV at higher rate)] x (Higher rate - Lower rate)
IRR = 12 + [495 / (495 - (-65))] x (13 - 12) = 12 + (495/560) = 12 + 0.88 = 12.88%.
DECISION: IRR (12.88%) > cost of capital (8%), therefore the investment is SOUND and should be accepted.
The other guaranteed 10-mark template. Memorise the interpolation formula EXACTLY. Bracket zero with a small +ve (12%, +495) and small -ve (13%, -65). Answer = 12.88%.
Source: Year not recorded
📖 BEE Guidebook Ch.7, Solved Example (p.185-186)
6. An oil-fired reheating furnace heats steel billets from 40 C to 1220 C at a furnace efficiency of 28%. It operates 4700 hours/annum. GCV of furnace oil = 10,000 kcal/kg, density 0.94 kg/litre, cost Rs.45/litre. Specific heat of billets = 0.12 kcal/kg C. (a) Energy needed to heat 12 tons of billets/hr. (b) Litres of furnace oil per ton of billet. (c) If efficiency improves 28% -> 30% by ceramic-fibre insulation, the hourly oil cost saving. (d) Simple payback if investment is Rs.20 lakhs. (e) How large an investment is justified for the efficiency improvement at an IRR of 16% per year over 6 years?
Model answer: (a) Heat = m x Cp x dT = 12000 kg x 0.12 x (1220-40) = 12000 x 0.12 x 1180 = 16,99,200 kcal/hr.
(b) Useful heat per ton = 16,99,200/12 = 1,41,600 kcal/ton. Input (at 28% eff) = 1,41,600/0.28 = 5,05,714 kcal/ton. Oil = 5,05,714/10,000 = 50.57 kg/ton = 50.57/0.94 = 53.79 litres/ton.
(c) Cost saving per ton = 53.79 x [1 - (0.28/0.30)] x Rs.45 = 53.79 x 0.0667 x 45 = Rs.161.37/ton. For 12 ton/hr: 161.37 x 12 = Rs.1936/hr.
(d) Annual saving = 1936 x 4700 = Rs.90,99,200 (approx Rs.91 lakh/yr). Simple payback = 20,00,000 / 90,99,200 = 0.22 year (approx 2.6 months). (The guidebook prints approx 0.35 yr; the arithmetically correct figure from 20 lakh / 91 lakh is 0.22 yr.)
(e) Max justifiable investment = annual net inflow x (sum of PV factors @16% for Yr1-6). PV factors @16%: 0.862+0.743+0.641+0.552+0.476+0.410 = 3.684. Max investment = 91 x 3.684 = 335.2 lakh = approx Rs. 3.35 CRORE. Invest up to Rs.3.35 crore and still earn the 16% target return.
Part (e) is the 'maximum affordable investment at a given IRR' technique: annual inflow x sum-of-PV-factors. 91 x 3.684 = 3.35 crore. Note the guidebook's printed 0.35-yr payback in (d) is a book slip; correct value is 0.22 yr.
Source: Year not recorded
Also uses Ch 3 · Basics of Energy & Its Forms — see that chapter
📖 BEE Guidebook Ch.7, Long Question L-1 (p.187)
7. A company invests Rs. 10 lakhs and completes an energy efficiency project at the beginning of year 1. The firm is investing its own money and expects an IRR of at least 26% on a constant positive annual net cash flow of Rs. 2 lakhs over 10 years. (1) Will the project meet the firm's expectations? (2) What is the IRR of this measure?
Model answer: The cash flow is a level annuity of Rs.2 lakh/yr for 10 years against Rs.10 lakh invested.
IRR is the rate at which the 10-year present-worth annuity factor equals Investment / Annual cash flow = 10 / 2 = 5.0.
Look up the annuity present-worth factor A = [1 - (1+r)^-10] / r for 10 years:
at r = 15%: A = 5.019
at r = 16%: A = 4.833
We need A = 5.0, which lies just below 15%. Interpolating: IRR = 15 + (5.019 - 5.0)/(5.019 - 4.833) = 15 + 0.019/0.186 = 15.1%.
(2) IRR is approximately 15% (about 15.1%).
(1) Since the IRR (approx 15%) is LESS than the required 26%, the project does NOT meet the firm's expectations and would be rejected on the firm's own hurdle rate. (Equivalently, NPV at 26% is negative.)
For a level annuity, IRR is where annuity factor = investment/annual CF = 5.0, giving ~15%. Because 15% < 26% hurdle, the answer is NO - it fails the firm's expectation.
Source: Year not recorded
📖 BEE Guidebook Ch.7, Long Question L-2 (p.187-188)
8. An energy-saving retrofit costs Rs. 1,00,000 and yields: energy & demand savings of 6000 kWh/year plus Rs. 3800/year in demand charges, and maintenance cost savings of Rs. 2000/year. Energy savings are valued at Rs. 3.00/kWh with no change in energy rates, and the project life is 10 years. Calculate the NPV against a 12% discount rate and give the decision.
Model answer: STEP 1 - Total annual saving = energy + demand + maintenance
= (6000 kWh x Rs.3.00) + Rs.3800 + Rs.2000 = 18,000 + 3,800 + 2,000 = Rs. 23,800/year (a level 10-year annuity).
STEP 2 - 12% present-worth annuity factor for 10 years = sum of PV factors @12% (Yr1-10): 0.893+0.797+0.712+0.636+0.567+0.507+0.452+0.404+0.361+0.322 = 5.651. (Check: [1-(1.12)^-10]/0.12 = 5.650.)
STEP 3 - PV of savings = 23,800 x 5.651 = Rs. 1,34,494.
NPV = PV of savings - initial cost = 1,34,494 - 1,00,000 = +Rs. 34,494 (approx Rs. 34,500).
DECISION: NPV is positive (> 0), so the retrofit is financially VIABLE and should be accepted.
Add all three savings streams first (23,800/yr). Then multiply by the 10-year @12% annuity factor (5.651). NPV approx +34,500 -> accept.
Source: Year not recorded
📖 BEE Guidebook Ch.7, Short Question S-1 (p.187)
9. 100 fused 60 W incandescent lamps (ILB) are replaced by 100 nos. of 12 W CFL (instead of new ILBs). For 4000 hours of operation per year, calculate: (i) the annual reduction in electricity cost if the energy charge is Rs.4/kWh and the demand charge is Rs.250/kVA/month; (ii) the simple payback period, given ILB costs Rs.10 (life 1000 h) and CFL costs Rs.100 (life 4000 h).
Model answer: (i) ANNUAL ELECTRICITY SAVING:
Connected-load reduction = 100 x (60 - 12) = 100 x 48 = 4800 W = 4.8 kW (approx 4.8 kVA at unity PF for lamps).
Energy saving = 4.8 kW x 4000 h = 19,200 kWh/yr -> energy cost saving = 19,200 x Rs.4 = Rs. 76,800/yr.
Demand saving = 4.8 kVA x Rs.250/kVA/month x 12 months = Rs. 14,400/yr.
Total annual reduction = 76,800 + 14,400 = Rs. 91,200/year.
(ii) SIMPLE PAYBACK:
Over the 4000-h CFL life, one CFL (Rs.100) replaces four ILBs (4 x Rs.10 = Rs.40, since ILB life is only 1000 h). Incremental cost per point = 100 - 40 = Rs.60; for 100 points = Rs. 6,000.
Simple payback = incremental investment / annual saving = 6,000 / 91,200 = 0.066 year (approx 0.8 month, under 25 days).
(If only the energy saving Rs.76,800 is credited, payback = 6,000/76,800 = 0.078 yr - still under 1 month.) The retrofit pays back almost immediately.
Two savings: energy (Rs.76,800) + demand (Rs.14,400) = Rs.91,200/yr. For the payback denominator, compare 1 CFL vs 4 ILBs over the 4000-h life (incremental Rs.6,000, not Rs.9,000).
Source: Year not recorded
📖 BEE Guidebook Ch.7, Sec 7.7-7.8 and Short Question S-2 (p.177-181)
10. Explain the operation of an Energy Service Company (ESCO) and energy performance contracting. Describe the three common types of performance contract, the services an ESCO offers, and the benefits and drawbacks of the ESCO route.
Model answer: WHAT AN ESCO IS: An ESCO provides a COMPLETE energy-project service - from assessment, to design, to construction/installation, together with engineering and project-management services AND financing.
PERFORMANCE CONTRACTING - 'PAYMENT ON PERFORMANCE': The contractor assumes responsibility for purchasing, installing and maintaining the equipment, but is PAID ONLY AFTER the installed equipment actually reduces the client's expenses. This removes any incentive to cut corners and often creates an incentive to EXCEED the savings estimate; scope is usually facility-wide to capture extra savings. The more risk assigned to the ESCO, the larger the share of savings it must be given.
THREE TYPES OF PERFORMANCE CONTRACT:
1. FIXED FEE - ESCO audits, designs and either helps implement or merely advises, for a fixed lump-sum fee. The ESCO bears the LEAST risk because its fee does not depend on the savings achieved.
2. SHARED SAVINGS - ESCO designs, FINANCES and implements the project, verifies the savings, and shares an agreed percentage of the actual energy savings with the host over a fixed period. The more energy saved, the higher the revenue to both parties.
3. GUARANTEED SAVINGS - ESCO designs and implements but does NOT finance the project (though it may arrange financing); it GUARANTEES that savings will be enough to cover the debt-service payments. Energy managers prefer this (most secure) but the extra security costs more. (A combination of part-fixed-fee and part-shared-savings is also used.)
SERVICES OFFERED: investment-grade energy audit (IGA); financing from own/arranged sources; purchase, installation and maintenance of efficient equipment; O&M training; monitoring; measurement & verification; and a guarantee of savings.
BENEFITS TO INDUSTRY: immediate facility upgrade with little/no up-front capital; access to ESCO expertise; positive cash flow; frees the firm's capital for core business; ESCO assumes several business risks including guaranteed performance.
DRAWBACKS: savings must be shared with the ESCO; depreciation/tax benefits must be negotiated; complex, potentially binding contracts, legal and administrative costs; risk-management/insurance cost when savings are guaranteed. Choose an ESCO with a good reputation and relevant experience.
Remember the THREE types (fixed fee / shared savings / guaranteed savings) and the key differentiator - who bears risk and who finances. Hire-purchase is NOT a performance contract (common objective trap).
11. What is sensitivity and risk analysis in the appraisal of energy-conservation projects? Why is it carried out, and list the micro and macro factors that are considered.
Model answer: DEFINITION: Sensitivity analysis is an ASSESSMENT OF RISK. Many project cash flows (capital cost, energy-cost savings, maintenance costs) are only estimates and future flows contain inflation, while project life itself can vary. Sensitivity analysis asks: how sensitive is the project's feasibility to changes in the input parameters? What if a factor is less favourable than predicted? By how much can a variable change before the project becomes unviable, and how likely is that?
WHY / WHEN: It is recommended particularly for MARGINAL (borderline) projects and for large projects near the cut-off rate. Example: if a project is feasible only while energy-cost escalation stays above 9% and the assumed escalation is 10%, the break-even is close - a HIGH-RISK project. Spreadsheets perform it easily with built-in 'what-if' functions; manually it is laborious (re-working the analysis many times). It identifies parameters that are both uncertain and to which the NPV/IRR decision is sensitive; 'switching values' (the change needed to flip accept/reject) are found. It leads to improved project design with mitigation of major uncertainties.
MICRO FACTORS (the firm CAN change): operating expenses; capital structure; costs of debt and equity; changing the form of finance (e.g. leasing); changing the project life.
MACRO FACTORS (the firm CANNOT change): changes in interest rates; changes in tax rates; changes in accounting standards (e.g. depreciation method); changes in depreciation rates; extension of government-subsidised schemes (e.g. rural electrification); general employment/salary trends; imposition of environmental and safety regulations; energy price change; technology changes.
Sensitivity analysis = 'assessment of risk' - used mainly on marginal projects. The clean split is Micro = things the firm controls (finance, project life, costs), Macro = external economy (interest/tax rates, depreciation rules, energy price, regulation).
Source: Year not recorded
📖 BEE Guidebook Ch.7, Sec 7.3 and Short Questions S-3, S-4, S-5 (p.165-172)
12. Compare the Net Present Value (NPV) and Internal Rate of Return (IRR) methods of investment appraisal, and state the limitations of the simple payback period method and of the ROI method.
Model answer: NPV vs IRR:
- In the NPV method the discount rate (cost of capital) is ASSUMED KNOWN, and the NPV of the project is calculated; accept if NPV > 0, and the higher-NPV project is better. NPV is essentially a COMPARISON tool that lets a number of different projects be compared, and it gives the result as an absolute money value.
- In the IRR method the NPV is SET EQUAL TO ZERO and the discount rate that satisfies this is found (the IRR); accept if IRR > the cost of capital. IRR is designed to assess whether a SINGLE project will achieve a target rate of return, and it expresses the result as a percentage rate, which businessmen often find easier to grasp.
- Both account for the time value of money and consider the whole cash-flow stream. A limitation of IRR is that it cannot distinguish between lending and borrowing, so a high IRR is not always desirable.
LIMITATIONS OF SIMPLE PAYBACK: (i) it ignores all savings that accrue AFTER the payback period (it favours early-inflow projects and discriminates against later-inflow projects); (ii) it does NOT consider the time value of money - cash inflows are simply added without discounting, violating the principle that flows at different times must be discounted before being combined.
LIMITATIONS OF ROI: (i) it does not take into account the time value of money; (ii) it does not account for the variable nature of annual cash inflows - the ROI figure is strictly valid only if the annual return continued in perpetuity, which is unrealistic.
Key one-liner examiners want: NPV assumes the discount rate and gives an absolute value for COMPARING projects; IRR solves for the rate that makes NPV=0 to test a SINGLE project against a hurdle. Both use time value of money; payback and ROI do not.
13. Describe the conventional financing options available for capital investment in energy-efficiency projects, bringing out the ownership and tax implications of each.
Model answer: Capital investment requires a source of funds; obtaining them is called FINANCING. The conventional options are:
1. DEBT FINANCING - borrowing money (loans, bonds) that is repaid later with interest. The company OWNS the equipment, so this suits long-term use. Cost of capital is easy to calculate (rates and schedules are documented), and interest payments are TAX-DEDUCTIBLE. However, the company takes ALL the risk and must install and manage the project itself.
2. EQUITY FINANCING - the lender acquires an ownership (equity) stake (via stocks) and shares in the firm's success. Its cost of capital is HIGHER than debt, partly because stock DIVIDENDS are NOT tax-deductible (unlike interest).
3. RETAINED EARNINGS - accumulated annual surpluses kept within the company instead of paid out as dividends. They belong to the stockholders, so the SAME cost of capital as stock applies.
4. CAPITAL LEASE - a mid-way arrangement between pure debt and pure equity that allows a lower cost of capital with third-party participation; it has partial-ownership characteristics.
5. TRUE LEASE - use of equipment WITHOUT ownership risks; reduces the risk of poor performance, service and obsolescence and suits SHORT-TERM use. Lease payments are tax-deductible, but NO depreciation tax benefit is available and ownership does NOT pass, even at the end of the lease.
6. PERFORMANCE CONTRACTING (ESCO) - 'pay on performance' with little or no up-front money; the ESCO carries much of the risk and shares in the savings. Attractive when the project is financed externally.
Confirmed vs Book-1 §7.6 (with §7.7) — tabulate option | ownership | tax treatment. Book traps: interest on debt IS tax-deductible but stock dividends are NOT; a capital lease is mid-way between pure debt and pure equity; a true lease gives NO depreciation benefit and NO ownership even at the end of the lease.
Source: unknown
📖 Book-1 §7.7 What is Depreciation? (with §7.4 salvage value / economic life)
14. What is depreciation? State the conditions for an asset to be depreciable, explain the straight-line method, and describe how depreciation acts as a 'tax shield' in the cash-flow analysis of an energy project.
Model answer: WHAT IT IS: Most assets used in a business decrease in value over time. Tax law permits reasonable deductions from taxable income to allow for this - these deductions are called DEPRECIATION ALLOWANCES.
CONDITIONS TO BE DEPRECIABLE (all three): (1) the asset must be held by the business for the purpose of PRODUCING INCOME; (2) it must WEAR OUT or be consumed in the course of its use; (3) it must have a life LONGER THAN ONE YEAR.
STRAIGHT-LINE METHOD: an equal amount is written off each year:
Annual depreciation = (Capital cost - Salvage value) / Useful life (years).
Example: equipment Rs.5,00,000, salvage Rs.50,000, life 10 yr -> (500000-50000)/10 = Rs.45,000/yr.
DEPRECIATION 'TAX SHIELD': depreciation is a NON-CASH expense, yet it is deductible from taxable income. By reducing taxable income it reduces the tax payable, which INCREASES the after-tax cash flow of the project. The cash benefit each year = Depreciation x Tax rate (the 'tax shield'). This is why after-tax NPV/IRR are more favourable than a simple pre-tax payback would suggest.
NOTE: under a TRUE LEASE the lessee does not own the asset, so NO depreciation tax benefit is available - a key point when comparing leasing against ownership.
Confirmed vs Book-1 §7.7 / §7.4 — quote the definition of depreciation allowances and the three depreciability conditions verbatim, then apply the straight-line method with the book’s salvage-value and economic-life terms. Depreciation is a non-cash charge that lowers taxable income → lowers tax → raises after-tax cash inflow; a true lease (§7.6) gives no such benefit.
Source: unknown
📖 21st National Certification Exam, Paper-1, Sep 2021 (25.09.2021)
15. A company invests Rs. 12 lakhs and completes an energy-efficiency project at the beginning of year 1, expecting an IRR of at least 8% on the investment. The project savings are: end of Year 1 = Rs.1.20 lakh, Year 2 = Rs.3 lakh, Year 3 = Rs.4 lakh, Year 4 = Rs.6 lakh, Year 5 = Rs.9 lakh. Will the project meet the firm's expectations? Justify using NPV at the firm's required rate.
Model answer: Test by computing NPV at the required 8% rate; if NPV > 0 the IRR exceeds 8% and the project meets expectations.
PV factors @8%: Yr1 0.926, Yr2 0.857, Yr3 0.794, Yr4 0.735, Yr5 0.681.
Yr1 1.20 x 0.926 = 1.111
Yr2 3.00 x 0.857 = 2.571
Yr3 4.00 x 0.794 = 3.176
Yr4 6.00 x 0.735 = 4.410
Yr5 9.00 x 0.681 = 6.129
Sum of PV of inflows = Rs. 17.397 lakh.
NPV = 17.397 - 12.00 = +Rs. 5.40 lakh (all figures in lakh).
DECISION: NPV is strongly positive at 8%, so the IRR is well above 8%. YES - the project comfortably meets the firm's expectations and should be accepted.
NPV at the hurdle rate is positive (+5.4 lakh), so IRR > 8% -> accept. Watch the rising cash-flow profile (1.2, 3, 4, 6, 9).
16. A company will invest in only ONE of two energy-conservation projects and requires a minimum return of 18%. Project A: investment Rs.17,50,000; net annual inflows Yr1-4 = Rs.4,00,000 each, Yr5 = Rs.5,00,000 (6,00,000 saving less 1,00,000 expense), Yr6 = Rs.6,00,000, Yr7 = Rs.6,00,000, Yr8 = Rs.3,80,300. Project B: investment Rs.12,00,000; net annual inflows Yr1 4,50,000, Yr2 4,00,000, Yr3 3,50,000, Yr4 3,00,000, Yr5 2,50,000, Yr6 2,00,000, Yr7 1,16,650. Using NPV, justify which project to choose.
Model answer: Because the two projects have different investments and lives, compare them on NPV (not payback).
NPV @18% (factors 0.847, 0.718, 0.609, 0.516, 0.437, 0.370, 0.314, 0.266):
Project A: 400000x0.847 + 400000x0.718 + 400000x0.609 + 400000x0.516 + 500000x0.437 + 600000x0.370 + 600000x0.314 + 380300x0.266 = 18,06,060; NPV_A = 18,06,060 - 17,50,000 = +Rs. 56,060.
Project B: 450000x0.847 + 400000x0.718 + 350000x0.609 + 300000x0.516 + 250000x0.437 + 200000x0.370 + 116650x0.314 = 12,56,178; NPV_B = 12,56,178 - 12,00,000 = +Rs. 56,178.
At 18% both NPVs are essentially EQUAL (approx Rs.56-57 thousand), so both are acceptable and the tie must be broken.
BREAK THE TIE at 20% (factors 0.833, 0.694, 0.579, 0.482, 0.402, 0.335, 0.279, 0.233):
Project A NPV @20% = 16,93,210 - 17,50,000 = -Rs. 56,790 (negative).
Project B NPV @20% = 11,99,745 - 12,00,000 = approx -Rs. 250 (about zero).
DECISION: At the higher 20% rate Project B (approx breakeven) clearly outperforms Project A (strongly negative). Project B holds its value better, so PROJECT B is recommended.
Both projects have nearly identical NPV at 18%, so you MUST raise the rate (to 20%) to break the tie. B stays near zero while A goes sharply negative -> choose B.
Source: Year not recorded
📖 24th National Certification Exam, Paper-1, Sep 2024
17. Evaluate a multi-phase project over 5 years: initial investment Rs.20 lakhs; an additional investment of Rs.5 lakhs in Year 3; salvage value Rs.3 lakhs at end of Year 5. Yearly savings (Rs. lakhs): Y1 6, Y2 7, Y3 4, Y4 9, Y5 12. Calculate the Internal Rate of Return (IRR) by interpolation.
The trick is building the net cash-flow column: Y3 nets to -1 (extra 5-lakh outlay), Y5 to +15 (add salvage). Then bracket zero at 19%/20% and interpolate to 19.32%.
Source: Year not recorded
📖 25th National Certification Exam, Paper-1, Sep 2025
18. An industry is exploring two options for its energy-efficiency strategy; only one will be chosen. Discount rate 10%, project life 5 years. Project A: capital Rs.80,000, annual saving Rs.25,000/yr. Project B: capital Rs.1,00,000, annual saving Rs.35,000/yr. Using NPV, find the better option.
Model answer: PV factors @10% (Yr1-5): 0.909, 0.826, 0.751, 0.683, 0.621; sum = 3.790.
Project A: NPV = -80,000 + 25,000 x 3.790 = -80,000 + 94,750 = +Rs. 14,750.
Project B: NPV = -1,00,000 + 35,000 x 3.790 = -1,00,000 + 1,32,650 = +Rs. 32,650.
DECISION: Both NPVs are positive (both viable), but Project B (Rs.32,650) has the higher NPV. Therefore PROJECT B is the better option.
Level annuity, so use the summed 5-year @10% factor (3.790) x annual saving. Higher NPV wins -> Project B.
Source: Year not recorded
📖 §7.3.5 Internal rate of return (IRR) method
19. A paper mill has two investment options for energy saving projects: Option A: Investment envisaged Rs.40 lakhs, annual return is Rs.8 lakhs, life of the project is 10 years, discount rate 10%. Option B: Investment envisaged Rs.24 lakhs, annual return Rs.5 lakhs, life of the project is 8 years, discount rate is 10%. Calculate IRR of both the options and suggest which option the paper mill should select considering the risk is same for both the options.
Model answer: Option A: solve -40 x 10^5 = 8 x 10^5/(1+X)^1 + ... + 8 x 10^5/(1+X)^10, giving IRR = 15.10 %. Option B: solve -24 x 10^5 = 5 x 10^5/(1+X)^1 + ... + 5 x 10^5/(1+X)^8, giving IRR = 13 %. Based on IRR, Option A has higher IRR and the mill may opt for option A.
IRR is the rate that drives NPV to zero, and with equal annual returns you can shortcut it: the annuity factor is capital/annual return = 40/8 = 5.0 for 10 years, which sits between the 10-year factors at 15% and 16% — hence about 15.1%. Option B: 24/5 = 4.8 for 8 years ≈ 13%. Show the interpolation line even if you use tables; the method carries most of the marks. Since the risk is the same for both, the higher IRR (Option A) wins — say so explicitly.
Source: Oct 2011
📖 §7.3.5 Internal rate of return (IRR) method
20. A paper mill has two investment options for energy saving projects: Option A: Investment envisaged Rs.40 lakhs, annual return is Rs.5 lakhs, life of the project is 10 years, discount rate 10%. Option B: Investment envisaged Rs.24 lakhs, annual return Rs.8 lakhs, life of the project is 8 years, discount rate is 10%. Calculate IRR of both the options and suggest which option the paper mill should select considering the risk is same for both the options.
Model answer: Option A: solve -40 x 10^5 = 5 x 10^5/(1+X)^1 + ... + 5 x 10^5/(1+X)^10, giving IRR = 4.28 %. Option B: solve -24 x 10^5 = 8 x 10^5/(1+X)^1 + ... + 8 x 10^5/(1+X)^8, giving IRR = 28.98 %. Based on IRR, the mill may opt for Option B (higher IRR).
The numbers are the mirror image of the other paper: A gives 40 lakh for 5 lakh a year over 10 years — total undiscounted return is only 50 lakh, so the IRR must be tiny (≈4.3%), below any realistic cost of capital. B gives 24 lakh for 8 lakh a year, annuity factor 3.0 over 8 years ≈ 29%. Quick sanity check before you grind through trial and error: if capital/annual return is close to the project life, IRR is near zero. Pick B and state that A does not even beat the 10% discount rate.
Source: Oct 2011
📖 §7.3.4 Net present value (NPV) method — with salvage value
21. It is proposed to install a heat recovery device in a process industry. The capital cost of installing the device is Rs.2,00,000 and after 5 years its salvage value is envisaged at Rs.15,000. The savings accrued by the heat recovery device are as shown below. Determine the net present value after 5 years for a discount rate of 8%. Year / Savings (Rs.): 1, 70,000; 2, 60,000; 3, 60,000; 4, 50,000; 5, 50,000.
Model answer: Year / Discount factor for 8% / Capital Investment (Rs.) / Net savings (Rs.) / Present value (Rs.): 0, 1.00, -200000, -, -200000; 1, 0.926, -, 70000, +64820; 2, 0.857, -, 60000, +51420; 3, 0.794, -, 60000, +47640; 4, 0.735, -, 50000, +36750; 5, 0.681, -, 50000 + 15000, +44265. NPV = +44895. It is evident that over a 5-year life-span the net present value of the project is 44895.
Salvage value is a cash INFLOW in the final year and must be discounted with the same year-5 factor: 15,000 × 0.681 = Rs 10,215, added to the year-5 saving. Total: −2,00,000 + 64,820 + 51,420 + 47,640 + 36,750 + 34,050 + 10,215 ≈ +Rs 44,895, so the project is accepted. Present the answer as a table (year / discount factor / cash flow / present value) — the book's own format, and it earns method marks even if one number slips.
Source: Aug 2013
📖 §7.3.4 Net present value (NPV) method — with salvage value
22. It is proposed to install a heat recovery device in a process industry. The capital cost of installing the device is Rs.2,00,000 and after 5 years its salvage value is envisaged at Rs.25,000. The savings accrued by the heat recovery device are as shown below. Determine the net present value after 5 years for a discount rate of 8%. Year / Savings (Rs.): 1, 70,000; 2, 60,000; 3, 60,000; 4, 50,000; 5, 50,000.
Model answer: Year / Discount factor for 8% / Capital Investment (Rs.) / Net savings (Rs.) / Present value (Rs.): 0, 1.00, -200000, -, -200000; 1, 0.926, -, 70000, +64820; 2, 0.857, -, 60000, +51420; 3, 0.794, -, 60000, +47640; 4, 0.735, -, 50000, +36750; 5, 0.681, -, 50000 + 25000, +51075. NPV = +51705. It is evident that over a 5-year life-span the net present value of the project is 51075 (as printed in the key).
Same table as the Rs 15,000-salvage version; only the last line changes: 25,000 × 0.681 = Rs 17,025. NPV ≈ −2,00,000 + 64,820 + 51,420 + 47,640 + 36,750 + 34,050 + 17,025 ≈ +Rs 51,705. Use the book's 8% factors (0.926, 0.857, 0.794, 0.735, 0.681) rather than recomputing 1/(1.08)^n under exam pressure. Positive NPV → recommend the heat recovery device.
Source: Aug 2013
📖 §7.3.4 Net present value (NPV) — comparing two projects
23. A company has to choose between two projects whose cash flows are as indicated below;
Project 1:
i. Investment – Rs. 15 Lakhs ii. Annual cost savings – Rs. 4 lakhs.
iii. Bi-annual maintenance cost – Rs. 50,000/- iv. Reconditioning and overhaul during 5th year: 6 lakhs v. Life of the project – 8 years vi. Salvage value – Rs. 5 lakhs
Project 2:
vii. Investment – Rs. 14 Lakhs viii. Annual cost savings – Rs. 3.5 lakhs.
ix. Annual Maintenance cost – Rs. 20,000/- x. Reconditioning and overhaul during 4th year: 5 lakhs xi. Life of the project – 8 years xii. Salvage Value- 2 lakhs
Which project should the company choose? The annual discount rate is 12%.
Build one table per project with a NET cash-flow column: Project 1 has a bi-annual (every second year) maintenance of Rs 0.5 lakh, so it hits years 2, 4, 6, 8 only, plus the Rs 6 lakh overhaul in year 5 and Rs 5 lakh salvage in year 8. Project 2 has Rs 0.2 lakh EVERY year, a Rs 5 lakh overhaul in year 4 and Rs 2 lakh salvage. Discount at 12% and choose the higher NPV. Marks are usually lost on 'bi-annual' — treat it as every two years, and say in your answer that you have done so.
Source: Sep 2017
📖 §7.3.4 Net present value (NPV) — comparing two projects
24. A company has to choose between two projects whose cash flows are as indicated below;
Project 1:
i. Investment – Rs. 15 Lakhs ii. Annual cost savings – Rs. 4 lakhs.
iii. Bi-annual maintenance cost – Rs. 50,000/- iv. Reconditioning and overhaul during 5th year: 6 lakhs v. Life of the project – 8 years vi. Salvage value – Rs. 2 lakhs
Project 2:
vii. Investment – Rs. 14 Lakhs viii. Annual cost savings – Rs. 3.5 lakhs.
ix. Annual Maintenance cost – Rs. 20,000/- x. Reconditioning and overhaul during 4th year: 5 lakhs xi. Life of the project – 8 years xii. Salvage Value- 5 lakhs
Which project should the company choose? The annual discount rate is 12%.
Same two projects with the salvage values swapped (Project 1 gets Rs 2 lakh, Project 2 gets Rs 5 lakh) — so the answer can flip, which is exactly why you must recompute rather than recall. Salvage is discounted at the year-8 factor 1/1.12⁸ = 0.404, so a Rs 3 lakh swing in salvage is worth only about Rs 1.2 lakh of NPV. State that observation in your conclusion; it shows you understand discounting rather than just arithmetic.
Source: Sep 2017
📖 §7.7 Energy performance contracting and the role of ESCOs
25. a) Explain briefly three types of Performance Contracting? (6 Marks) b) What are the drawbacks of ESCO? (4 Marks)
Model answer: a) THREE TYPES OF PERFORMANCE CONTRACTING:
1. GUARANTEED SAVINGS CONTRACT: the ESCO guarantees a certain level of energy saving to the client. The client raises the finance (takes the loan) and carries the credit risk; the ESCO carries the performance risk. If the guaranteed savings are not achieved, the ESCO pays the difference to the client; savings above the guarantee may be shared.
2. SHARED SAVINGS CONTRACT: the ESCO arranges/provides the finance and the actual monetary savings achieved are shared between the ESCO and the client in a pre-agreed proportion for an agreed period. The ESCO carries both the performance risk and the credit risk; the client makes no up-front investment.
3. FIRST-OUT (PAID FROM SAVINGS) CONTRACT: 100 % of the energy cost savings go to the ESCO until the project cost, the interest and the agreed profit margin have been fully recovered; thereafter the entire saving reverts to the client. The contract duration is not fixed - it ends when the ESCO has been paid out.
(Other variants seen in practice: fixed fee / build-own-operate-transfer and equipment leasing arrangements.)
b) DRAWBACKS / LIMITATIONS OF THE ESCO ROUTE:
- The client has to share a substantial part (often most) of the monetary savings with the ESCO, so the net benefit to the client is reduced.
- Measurement and verification of savings is complex and is a frequent source of dispute (establishing the baseline, adjusting for production, weather, product mix).
- Long contract periods lock the client in and restrict flexibility to modify or shut down the process/equipment.
- The ESCO needs access to the client's data and site, raising confidentiality and interference concerns.
- ESCOs are often small companies with limited capital; financing is costly and lenders perceive high risk, so interest rates are high.
- The client bears the risk of poor performance/abandonment if the ESCO becomes insolvent, and there is a lack of standard contract documents and of trust between parties.
[The official answer sheet states only: 'Refer BEE Guide Book 1 - Page No.178'.]
Fix the three types by who carries which risk: GUARANTEED SAVINGS — client borrows and carries the credit risk, ESCO guarantees the saving and carries performance risk; SHARED SAVINGS — ESCO finances and both share the saving in an agreed ratio, so the ESCO carries both risks; FIXED FEE / paid-from-savings — the client pays an agreed fee irrespective of the actual saving. Drawbacks to list: high transaction cost, disputes over measurement and verification of the baseline, client's credit risk, long contract periods and the ESCO's own difficulty in raising finance. Do not confuse a performance contract with a lease — a true lease gives the client no depreciation benefit.
Source: Sep 2018
📖 §7.3.1 Simple payback period (fuel switching) with CO₂ accounting
26. In the washing process of an automobile plant, electricity is being used to heat 5000 litres/hr of water by 8 °C. The industry is planning to convert from Electrical heating to LPG heating. Other Parameters: Annual operating hours = 6000 hours; Efficiency of indirect heating with LPG = 85%; Efficiency of electrical heating = 95%; Calorific value of LPG = 12,000 kcal/kg; Landed cost of LPG = Rs.60/kg; Cost of electricity = Rs.8/kWh. a) If electrical heating is replaced with LPG heating, with an investment is Rs.15 lakhs, compute the simple payback period. (6 Marks) b) Also, calculate the CO2 emissions in both the cases considering the emission factors for LPG as 3 tons of CO2/Ton of LPG and Electricity as 0.81 tons of CO2/MWh. (4 Marks)
Model answer: a) Water flow rate = 5000 litres/hr; Temperature rise = 8 °C
Useful heat required = (5000 x 1 x 8) = 40,000 kcal/hr
Equivalent LPG consumption = 40000 / (12000 x 0.85) = 3.92 kg/hr
Hourly cost of operating with LPG = 3.92 x 60 = Rs. 235/hr
Equivalent electricity consumption = 40000 / (860 x 0.95) = 48.96 kW
Hourly cost of operating with electricity = 48.96 x 8 = Rs. 391.68/hr
Difference in hourly operating cost = Rs. (391.68 - 235) = Rs. 156.68/hr
Annual monetary savings = Rs. 156.68/hr x 6000 hrs/yr = Rs. 9,40,080/yr
Investment = Rs. 15,00,000
Simple payback period = Rs. 15,00,000 / Rs. 9,40,080 per year = 1.6 years
b) Annual CO2 emission with electrical heating = 48.96 kW x 6000 hrs x (0.81 kg CO2/kWh)
= 2,37,946 kg CO2/yr = 237.95 tonnes CO2/yr
Annual CO2 emission with LPG heating = 3.92 kg LPG/hr x 6000 hr/yr x (3 kg CO2/kg LPG)
= 70,560 kg CO2/yr = 70.6 tonnes CO2/yr
Thus, by converting from electricity to LPG use there is a large advantage not only in operating cost but also in reduced CO2 emissions.
Set both options on the same USEFUL heat: 5000 × 1 × 8 = 40,000 kcal/h. LPG input = 40,000/(12,000 × 0.85) = 3.92 kg/h → Rs 235/h. Electrical input = 40,000/(860 × 0.95) = 48.96 kWh/h → Rs 392/h. Saving ≈ Rs 157/h × 6,000 h = Rs 9.4 lakh/year, payback = 15/9.4 ≈ 1.6 years. The conversion everyone forgets is 1 kWh = 860 kcal — write it down before you start. For part (b) apply each emission factor to its own fuel quantity: LPG tonnes × 3, and MWh × 0.81.
Source: Sep 2019
📖 §7.3.5 Internal rate of return (IRR) method
27. A company has got the following two energy saving project investment options: Option A: Investment envisaged is Rs. 40 lakhs with an annual return of Rs. 12 lakhs; life of the project is 5 years. Calculate IRR. Option B: A project having IRR of 12%. Which option should the company select?
Model answer: OPTION A:
Investment = Rs. 40 lakh; Annual return = Rs. 12 lakh; Life of project = 5 years
At IRR the NPV is zero:
0 = (-) 40 + (12) [1/(1+i)^1 + 1/(1+i)^2 + 1/(1+i)^3 + 1/(1+i)^4 + 1/(1+i)^5]
Solving by trial and error / interpolation, IRR = 15.24 %
OPTION B: IRR = 12 %
DECISION: based on IRR, Option A has the higher IRR value (15.24 % > 12 %), so the company may opt for Option A.
Annuity shortcut: 40/12 = 3.333 is the 5-year factor you need; the 5-year factors are 3.605 at 12% and 3.274 at 16%, so the IRR sits near 15.2%. Then compare: 15.24% for A against 12% for B, so A is selected. Whenever annual returns are equal, use capital/annual return as the annuity factor and interpolate — far faster and less error-prone than year-by-year trial and error.
Source: Sep 2019
📖 §7.3.5 Internal rate of return — interpolation formula
28. A company invests Rs. 12 lakhs and completes an energy efficiency project at the beginning of year 1. The firm is investing its own reserve money and expects an internal rate of return (IRR) of at least 12% on constant positive annual net cash flow of Rs. 3 lakhs, over a period of 5 years, starting with year 1. a) Will the project meet the firm's expectations? (3 Marks) b) What is the IRR of this measure? Use the interpolation formula for obtaining the nearest IRR value: IRR = (lower discount rate %) + [(NPV at lower discount rate) x (higher discount rate % - lower discount rate %)] / (NPV at lower discount rate - NPV at higher discount rate). (7 Marks)
Model answer: a) Use the NPV formula with d = 0.12 over n = 5 years.
Year 0: -12,00,000; Years 1 to 5: +3,00,000 each.
NPV at 12% = -12,00,000 + 3,00,000/1.12 + 3,00,000/(1.12)^2 + ... + 3,00,000/(1.12)^5
= -12,00,000 + 2,67,857.1 + 2,39,158.2 + 2,13,534.1 + 1,90,655.4 + 1,70,228.1
= Rs. (-)1,18,567.
As the NPV is negative at 12%, the project will NOT meet the firm's expectation of a 12% return.
b) Since NPV is negative at 12%, the IRR must be lower than 12%. Iterating:
NPV at 12% = -1,18,567
NPV at 8% = -2,186.99
NPV at 7% = +30,059.23
NPV at 7.929% = +57.82
The NPV crosses zero between about 7.5% and 7.9%, so the IRR of the measure is approximately 7.9% (well below the 12% required).
Annuity factor = 12/3 = 4.0 for 5 years. At 12% the 5-year factor is 3.605, so NPV = 3,00,000 × 3.605 − 12,00,000 = −Rs 1.18 lakh: the project does NOT meet the 12% expectation. Now interpolate with a lower rate (say 8%, factor 3.993 → NPV ≈ −Rs 0.02 lakh) using IRR = lower rate + NPV_low × (higher − lower)/(NPV_low − NPV_high); IRR works out just under 8%. Use the exact interpolation formula printed in the question — the examiner marks the substitution, not your calculator.
Source: Mar 2021
📖 §7.3.5 IRR; §7.3.2 ROI limitations; §7.3.1 payback advantages
29. A proposed project requires an initial capital investment of Rs. 100 Lakhs. The cash flows generated by the project are: Year 0 = -100, Year 1 = 30, Year 2 = 30, Year 3 = 40, Year 4 = 45 (Rs. in Lakhs). (a) If the cost of fund is available at 11% for the project, calculate internal rate of return (IRR) for the given project. (6 Marks) (b) What are the limitations of Return on Investment (ROI) technique? (2 Marks) (c) What are the advantages of Simple Payback period technique? (2 Marks)
Model answer: [OCR: the cash-flow row of the table is illegible in the scanned paper - it prints as 'atl al a a 45'. The values -100, 30, 30, 40 and 45 lakhs are recovered from the model answer printed in the same paper.]
(a) The IRR is the value of r satisfying:
0 = -100 + 30/(1+r) + 30/(1+r)^2 + 40/(1+r)^3 + 45/(1+r)^4
At r = 12%: RHS = -100 + 26.78 + 23.91 + 28.47 + 28.59 = +7.77
At r = 15%: RHS = -100 + 26.08 + 22.68 + 26.30 + 25.72 = +0.78
At r = 16%: RHS = -100 + 25.86 + 22.29 + 25.62 + 24.85 = -1.36
So r lies between 15% and 16%, close to 15%. By interpolation:
IRR = 15 + [0.80 x (16 - 15)] / [0.80 - (-1.36)] = 15 + 0.80/2.16 = 15.37%
The IRR is 15.37%, which is above the 11% cost of funds, so the project is acceptable.
(b) Limitations of ROI - Refer BEE Guidebook Book-1, Page 165: it does not take the time value of money into account; it takes no account of the project life or of the timing/pattern of the cash flows; the result varies with the accounting conventions used for depreciation and for the capital base; and it does not indicate the absolute size of the return.
(c) Advantages of simple payback - Refer BEE Guidebook Book-1, Page 166: it is simple to understand and to calculate; it uses readily available data; it gives a quick first screening of proposals; and by favouring quick recovery of capital it provides a rough measure of project risk and of liquidity, which suits firms with limited capital.
Total inflows are 145 against 100 invested, so the IRR is well above zero: at 10% NPV ≈ +Rs 8 lakh and at 15% NPV ≈ −Rs 4 lakh, giving an IRR of roughly 13% by interpolation — above the 11% cost of funds, so accept. ROI limitations to write: ignores the time value of money, ignores project life and the timing of flows, and is distorted by which year's cash flow you pick. Payback advantages: simple to compute and explain, needs no discount rate, and favours early cash recovery — useful as a first screen.
Source: Jul 2022
📖 §7.3.5 Internal rate of return (IRR) — multi-phase project
30. You are evaluating a multi-phase investment project with the following cash flows over a 5-year period. The project includes an initial investment of Rs. 20 Lakhs, an additional investment of Rs. 5 Lakhs in Year 3, and a salvage value of Rs. 3 Lakhs at the end of Year 5. The yearly savings (Rs. Lakhs) are: Year 1 = 6, Year 2 = 7, Year 3 = 4, Year 4 = 9, Year 5 = 12. Calculate the Internal Rate of Return (IRR) for the project. (10 Marks)
Model answer: Net cash flows (Rs. Lakhs):
Year 0 = -20 (initial investment)
Year 1 = +6
Year 2 = +7
Year 3 = -1 (savings 4 less additional investment 5)
Year 4 = +9
Year 5 = +15 (savings 12 plus salvage value 3)
The IRR is the discount rate at which the NPV of these flows is zero. Trial discounting gives:
NPV at 19% = +0.172 Lakhs
NPV at 20% = -0.351 Lakhs
By interpolation:
IRR = lower rate + [NPV at lower rate x (higher rate - lower rate)] / (NPV at lower rate - NPV at higher rate)
IRR = 19 + [0.172 x (20 - 19)] / [0.172 - (-0.351)]
IRR = 19 + 0.172/0.523
IRR = 19 + 0.32 = 19.32%
Build the NET cash-flow row first: year 3 is 4 − 5 = −1 (the extra investment) and year 5 is 12 + 3 = +15 (saving plus salvage). Then find the rate where the NPV of −20, +6, +7, −1, +9, +15 is zero — NPV is positive at 10% and negative at 15%, so the IRR is around 12–13% by interpolation. Netting the year-3 outgo and adding salvage into year 5 are the two marked steps. Note the sign change inside the series — the book warns that multiple sign changes can give more than one mathematical IRR.
Source: Sep 2024
📖 §7.3.4 Net present value (NPV) — comparing two projects
31. An industry is exploring two project development options as part of its energy efficiency strategy. Using the NPV concept, find out the better option. Consider 10% as the discount rate and 5 years as the project life. Project A: capital cost 80,000, net annual savings Rs. 25,000 in each of years 1 to 5. Project B: capital cost 100,000, net annual savings Rs. 35,000 in each of years 1 to 5. (10 Marks)
Model answer: NPV = -CF0 + CF1/(1+r)^1 + CF2/(1+r)^2 + ... with r = 0.10
PROJECT A
NPV = -80,000 + 25,000/(1.10) + 25,000/(1.10)^2 + 25,000/(1.10)^3 + 25,000/(1.10)^4 + 25,000/(1.10)^5
= -80,000 + 22,727 + 20,661 + 18,783 + 17,075 + 15,522
= Rs. 14,768
PROJECT B
NPV = -1,00,000 + 35,000/(1.10) + 35,000/(1.10)^2 + 35,000/(1.10)^3 + 35,000/(1.10)^4 + 35,000/(1.10)^5
= -1,00,000 + 31,818 + 28,926 + 26,296 + 23,905 + 21,732
= Rs. 32,677
Project B shall be preferable due to its higher NPV (Rs. 32,677 against Rs. 14,768 for Project A).
The 5-year annuity factor at 10% is 3.791, so you can do both in two lines: A = 25,000 × 3.791 − 80,000 = +Rs 14,768; B = 35,000 × 3.791 − 1,00,000 = +Rs 32,681. Both are viable but B adds more value, so B is chosen — note that B also has the better payback (2.86 vs 3.2 years), so the two criteria agree here. Learn the 10% annuity factors (0.909, 1.736, 2.487, 3.170, 3.791); they turn a ten-line table into one multiplication.
Source: Sep 2025
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