General Aspects of Energy Management & Energy Audit Available here with full solutions — 44 questions recovered from the 2016 exam:
Objective (1 mark)
44 of 50
Short (5 marks)
0 of 8
Long (10 marks)
0 of 6
This is not the complete paper. The questions below are the ones we could recover and verify; the rest of that year’s paper is not reproduced here. Every answer shown is checked against the 2014 BEE guidebook and carries its book section reference and an explanation.
Full paper pattern: Section-I 50×1 = 50 marks · Section-II 8×5 = 40 · Section-III 6×10 = 60 · Total 150, pass mark 75, 3 hours. ▶ Practice these interactively
Confirmed vs Book-1 §3.4 — Book-1 §3.4 Pressure: gauge pressure pg = ps - pa, so the absolute (system) pressure ps = gauge pressure + atmospheric pressure. Gauges are calibrated to read zero at atmospheric pressure, hence the atmospheric term must be added back.
📖 §3.4 Humidity — RH, specific humidity, DBT, WBT and dew point
2. The lowest theoretical temperature to which water can be cooled in a cooling tower is
Difference between DBT and WBT of the atmospheric air
Average DBT and WBT of the atmospheric air
DBT of the atmospheric air
WBT of the atmospheric air
Answer: D) WBT of the atmospheric air …….…….
Confirmed vs Book-1 §3.4 — The wet-bulb temperature of the entering air is the theoretical minimum to which evaporative cooling can cool the water; the approach (cold water temp - WBT) can be reduced but never taken to zero.
📖 §1.11 Energy Intensity on Purchasing Power Parity (PPP)
3. The energy intensity of countries that rely on import of carbon-intensive goods when compared with those producing it, would in all probability be
Higher
Lower
Almost equal
No correlation
Answer: B) Lower
Confirmed vs Book-1 §1.11 — 'a country that relies on trade to acquire (import) carbon-intensive goods will — when all other factors are equal — have lower energy intensity than the countries that manufacture the same goods for export.' The energy is spent in the exporting country, so the importer's energy/GDP is lower, not higher.
4. If a 2 KW immersion heater is used to heat 30litres of water at 30°C, what would be the temperature of water after 15 minutes? Assume no losses in the system
87.3 °C
44.3°C
71.3 °C
none of the above
Answer: B) 44.3°C
Confirmed vs Book-1 §3.4 — Energy = 2 kW x 0.25 h = 0.5 kWh = 0.5 x 860 = 430 kcal. Temperature rise dT = Q/(m·Cp) = 430/(30 x 1) = 14.3 degC. Final temperature = 30 + 14.3 = 44.3 degC.
5. 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.
📖 § 2.3.6 PAT — empanelment criteria for verification/check-verification
6. Verification and Check-verification under PAT will be carried out by
Designated consumers
Accredited energy auditors
Certified energy auditor
Empanelled accredited energy auditors
Answer: D) Empanelled accredited energy auditors
Confirmed vs Book-1 §2.3.6 — The chapter gives 'Empanelment Criteria of Accredited Energy Auditor's Firm for Verification and Check-Verification under PAT Scheme' (at least one accredited energy auditor, at least three energy auditors, ₹10 lakh turnover/net worth). So the work is done by EMPANELLED accredited energy auditors — mere accreditation without empanelment is not enough.
📖 §11.4 Solar Electrical Energy (Building-integrated PV) — with Book-1 Ch.10/energy-efficient buildings
7. Which of the following enhances the energy efficiency in buildings?
Light pipes
Triple glaze windows
Building integrated solar photovoltaic panels
All of the above
Answer: D) All of the above
Confirmed vs Book-1 §11.4 Solar Electrical Energy (Building-integrated PV) — with Book-1 Ch.10/energy-efficient buildings —
The book describes BIPV panels integrated into the roof or façade, generating daytime electricity and also providing weather-proofing and glazing.
Light pipes (daylighting) and triple-glazed windows likewise cut building energy use.
All three enhance building energy efficiency — answer d.
Confirmed — Book-1 PAT/M&V (outside the Ch-9 text): under Perform-Achieve-Trade a baseline (energy) audit fixes the reference year, and the Monitoring & Verification (M&V) audit by an empanelled verifier is carried out at the END of each PAT cycle to verify the SEC reduction achieved against target. Answer (c).
📖 §11.4 Solar Electrical Energy (Solar Photovoltaic Technology)
9. A solar _______ is connected and packaged in a solar _________, which in turn is linked with others in sequence in a solar _________.
module, cell, array
array, module, sequence
module, array, sequence
cell, module, array
Answer: D) cell, module, array
Confirmed vs Book-1 §11.4 Solar Electrical Energy (Solar Photovoltaic Technology) —
Book: ‘Solar cells are connected in series and parallel combinations to form modules … Modules can be connected together to form an array’ (36 cells × 0.5 V per cell = one module).
The order is therefore cell → module → array.
Answer d.
📖 §5.5 Material balance procedure — bone-dry solids balance
10. In a drying process product moisture is reduced from 60% to 30%. Inlet weight of the material is 200 kg. Calculate the weight of the outlet product.
80
120.5
114.3
none of the above
Answer: C) 114.3
Confirmed vs Book-1 §5.5 (dry-solids balance, as in Ex.5.11): Bone-dry solids = 200 × (1 − 0.60) = 80 kg and are unchanged. Outlet product at 30% moisture is 70% solids, so outlet = 80/0.70 = 114.3 kg. Option (c).
📖 §4.1 Energy management (EnMS rationale; ISO 50001 detail in Book-1 Ch6)
11. Which among the following factor(s) is most appropriate for adopting EnMS?
To improve their energy efficiency
To reduce costs
To increase productivity
Systematically manage their energy use
Answer: D) Systematically manage their energy use
Confirmed vs Book-1 §4.1 — The defining purpose of an EnMS (ISO 50001) is to give an organisation a systematic, continual framework for managing energy use — policy, targets, measurement and review. Improved efficiency, lower cost and higher productivity are outcomes that follow from that system, not the reason the system itself is adopted.
📖 §10.5 Man-made CO2 emissions (fuel carbon content)
12. Which energy source releases the most climate-altering carbon pollution per kg?
Oil
Coal
Rice husk
Bagasse
Answer: A) Oil
Confirmed vs Book-1 §10.5 — CO2 released per kg of fuel = carbon fraction × 44/12. Oil has the highest carbon content per kg (~85%, giving ~3.1 kg CO2/kg) compared with coal (the book uses 1.53 kg CO2/kg coal in EOC S-1), while rice husk and bagasse are biomass and treated as carbon-neutral. Note the stem asks per KG of fuel; per unit of HEAT, coal is the dirtiest. Options repaired: stray leading '.' removed.
📖 §7.3 Financial Analysis Techniques — Time Value of Money
13. 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.
📖 §6.4 Energy Policy and Planning - Develop an Energy Policy
14. Having a documented energy policy in industry
Satisfies regulations
Reflects top management commitment
Indicates availability of energy audit skills
None of the Above
Answer: B) Reflects top management commitment
Confirmed vs Book-1 §6.4 Energy Policy and Planning — The guidebook states a formal written energy policy is a public expression of the organisation's commitment to energy management and is ratified by the head of the organisation - hence it reflects top management commitment. It is not driven by regulation (a) and is unrelated to the availability of in-house energy audit skills (c).
📖 §3.4 Fuel properties — density, specific gravity, viscosity
15. Red wood seconds is a measure of
Density
Viscosity
Specific gravity
Flash point
Answer: B) Viscosity
Confirmed vs Book-1 §3.4 — Book-1 §3.4 Viscosity: 'Viscosity is measured in Stokes/Centistokes. Sometimes viscosity is quoted in Engler, Saybolt or Redwood.' Redwood seconds is therefore a viscosity measure.
📖 §11.1 Concept of New and Renewable Energy (cross-reference: Book-1 Ch.1 — installed generating capacity)
16. Which amongst the following sources of electricity has the highest installed capacity in India ?
Gas
Nuclear
Oil
Renewables
Answer: D) Renewables
Confirmed vs Book-1 §11.1 Concept of New and Renewable Energy (cross-reference: Book-1 Ch.1 — installed generating capacity) —
Of the four options listed (gas, nuclear, oil, renewables), renewables carry by far the largest installed capacity in India — nuclear and oil-based capacity are only a few GW each.
(Coal, which is the largest single source overall, is not among the options.)
Answer d.
18. In a solar thermal power station , molten salt which is a mixture of 60% sodium nitrate and 40% potassium nitrate is used. It is preferred as it provides an efficient low cost medium to store _______
Electrical energy
Thermal energy
Kinetic energy
Potential energy
Answer: B) Thermal energy
Confirmed vs Book-1 §11.4 Solar Electrical Energy (Power Towers) —
Book: molten salt = 60% sodium nitrate + 40% potassium nitrate, ‘preferred as it provides an efficient low-cost medium to store thermal energy and it is non-flamable and nontoxic’.
It is charged at 566°C and returned at 288°C via the hot- and cold-salt tanks.
Answer b.
📖 §3.4 Fuels & combustion — see also Book-1 Ch.4 / Book-2 Ch.1 Fuels and Combustion
19. For every 10°C rise in temperature, the rate of chemical reaction doubles. When the temperature is increased from 30°C to 70°C, the rate of reaction increases __________ times.
8
64
16
none of the above
Answer: C) 16
Confirmed vs Book-1 §3.4 — A rise of 70 - 30 = 40 degC contains 40/10 = 4 doublings, so the rate increases by 2^4 = 16 times. Book-1 Ch.3, Fuels & combustion — see also Book-1 Ch.4 / Book-2 Ch.1 Fuels and Combustion.
Confirmed vs Book-1 §11.6 Biomass Energy (Gasification of Biomass) —
Book: producer gas contains CO, H₂ and traces of CH₄ (typical CO 19±3%, H₂ 18±2%, CH₄ 3±1%, balance CO₂ and N₂).
Its calorific value is 1000–1200 kcal/Nm³.
Answer a.
21. The essential elements of monitoring and targeting system is
Recording
Reporting
Controlling
All of the above
Answer: D) All of the above
Confirmed vs Book-1 §9.4 — the key elements are Recording, Analysing & Comparing, Setting Targets, Monitoring, Reporting and Controlling. Recording, Reporting and Controlling are all listed, so 'all of the above'. Answer (d).
22. One energy saving certificate ( ESCerts) under PAT is equivalent to
one ton of carbon
one MWh of electricity
one ton of coal
one ton of Oil equivalent
Answer: D) one ton of Oil equivalent
Confirmed vs Book-1 §2.3.6 — ESCerts are denominated in energy, not carbon: one ESCert equals one metric tonne of oil equivalent (1 MTOE = 1 x 10^7 kcal) of energy saved beyond the notified SEC target. A tonne of carbon is a CDM/CER unit and MWh/tonne of coal are not the PAT unit of account.
23. In an industry the billed electricity consumption for a month is 5.8 lakh kWh. The fixed electricity consumption of the plant is 30000kWh and with a variable electricity consumption of 11 kWh/ton. Calculate the production of the industry
50000 tonnes
60000 tonnes
58000 tonnes
None of the above
Answer: A) 50000 tonnes
Confirmed vs Book-1 §9.6 — E = C + M·P, so P = (E - C)/M = (5,80,000 - 30,000)/11 = 5,50,000/11 = 50,000 tonnes. The fixed 30,000 kWh must be deducted before dividing by the variable rate. Answer (a).
📖 §3.3 Power factor — power triangle kW/kVA/kVAr, PF = cosθ
24. If the reactive power drawn by a particular load is zero it means the load is operating at
Lagging power factor
Unity power factor
Leading power factor
none of the above
Answer: B) Unity power factor
Confirmed vs Book-1 §3.3 — kVAr = kVA·sinθ. Zero reactive power means sinθ = 0, i.e. θ = 0 and PF = cosθ = 1 - a purely resistive load operating at unity power factor.
Confirmed vs Book-1 Ch.3 — Capital cost is the one-time investment - design, installation and commissioning of the project. Operation and maintenance costs are recurring operating costs, not capital cost.
26. 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'.
Confirmed vs Book-1 §3.5 — The kilowatt-hour is power x time = energy (work). 1 kWh = 1000 W x 3600 s = 3.6 x 10^6 J (Book-1 §3.3). Book-1 Ch.3, Energy units and conversions.
📖 §3.1 Energy forms — background from Book-1 Ch.1 Energy Scenario
28. Which among the following is a green house gas?
Sulphur Dioxide
Carbon Monoxide
NO2
Methane
Answer: D) Methane
Confirmed vs Book-1 §3.1 — Methane (CH4) is a greenhouse gas and, weight for weight, traps about 21 times more heat than CO2. SO2 and CO are air pollutants but not counted as GHGs; NO2 is a pollutant (N2O is the GHG).
29. Greenhouse effect is caused by natural affects and anthropogenic effects. If there is no natural greenhouse effect, the Earth's average surface temperature would be around __________°C.
0
32
14
- 18
Answer: D) - 18
Confirmed vs Book-1 §10.5 — 'Without naturally occurring greenhouse gases such as water vapour, carbon dioxide, methane and nitrous oxide, the earth's average surface temperature would be a cold −18°C rather than the tolerable 15°C.' The natural greenhouse effect is what makes life on Earth possible.
📖 §3.4 Specific heat — Table 3.1 Specific heat of common substances
30. The quantity of heat required to raise the temperature of a given substance by 1 o C is known as:
sensible heat
specific heat
heat capacity
latent heat
Answer: C) heat capacity
Confirmed vs Book-1 §3.4 — Heat capacity is the heat required to raise the temperature of a GIVEN substance/body by 1 degC; specific heat is the same quantity referred to 1 kg of substance (Book-1 §3.4).
📖 §5.2 Components of material and energy balance (Fig 5.1)
32. A mass balance for energy conservation does not consider which of the following
Steam
water
Lubricating oil
Raw material
Answer: C) Lubricating oil
Confirmed vs Book-1 §5.2 Fig 5.1: the streams counted are raw materials, chemicals, water/air, energy/power (inputs) and products, by-products, emissions, wastewater and wastes (outputs). Steam, water and raw material are all such process streams; lubricating oil is a maintenance consumable and is not taken in the mass balance. Option (c).
Confirmed vs Book-1 §4.12 — Book §4.12: the sling psychrometer's two thermometers give the dry-bulb and the wet-bulb temperature, and humidity is then COMPUTED from the two readings. Absolute humidity is therefore a derived quantity, not something the instrument measures, so (d) is wrong.
📖 §7.3 Financial Analysis Techniques — Simple Payback Period
34. 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.
📖 § Investment appraisal (general — developed in Book-1 Ch5)
35. To judge the attractiveness of any investment, the energy auditor must consider
Initial capital cost
Net operating cash inflows
salvage value
all the above
Answer: D) all the above
Confirmed vs Book-1 §2 (general) — An investment's attractiveness depends on the initial capital cost, the net operating cash inflows it generates over its life and the salvage value at the end — all three enter the payback / NPV / IRR calculation, so 'all the above' is correct. Picking any single item ignores the other two cash flows.
36. In a cumulative sum chart if the graph is going up, it means
Energy consumption is going up
Energy consumption is going down
Specific energy consumption is coming down
No inference can be made
Answer: A) Energy consumption is going up
Confirmed vs Book-1 §9.6 — CUSUM = Σ(E_act - E_calc); a RISING line means actual consistently exceeds the calculated/target consumption, i.e. energy consumption (and specific energy consumption) is going up - performance is worsening due to poor control, housekeeping or maintenance. A falling line indicates savings. Answer (a).
📖 §4.12 Energy audit instruments — Ultrasonic Flow Meter
37. Doppler effect principle is used in the following instrument
lux meter
ultrasonic flow meter
infrared thermometer
flue gas analyzer
Answer: B) ultrasonic flow meter
Confirmed vs Book-1 §4.12 — Book §4.12: "Doppler ultrasonic flow meters measure dirty liquids. They compute flow rate based on a frequency shift that occurs when their ultrasonic signals reflect off particles in the flow stream." A lux meter uses a light-sensitive cell, an IR thermometer thermal radiation and a flue-gas analyser chemical cells — none uses the Doppler effect.
📖 §3.4 Fuels & combustion — see also Book-1 Ch.4 / Book-2 Ch.1 Fuels and Combustion
38. In a coal fired boiler, hourly consumption of coal is 1300 kg. The ash content in the coal is 6%. Calculate the quantity of ash formed per day. Boiler operates 24 hrs/day.
216 kg
300 kg
1872 kg
none of the above
Answer: C) 1872 kg
Confirmed vs Book-1 §3.4 — Coal fired per day = 1300 kg/h x 24 h = 31,200 kg. Ash = 6% x 31,200 = 1872 kg/day. Book-1 Ch.3, Fuels & combustion — see also Book-1 Ch.4 / Book-2 Ch.1 Fuels and Combustion.
39. Liquid fuel density is measured by an instrument called
Tachometer
hygrometer
anemometer
none of the above
Answer: D) none of the above
Confirmed vs Book-1 §4.12 — Density of a liquid fuel is measured with a HYDROMETER (or by a density/specific-gravity bottle), which is not among the options. A hygrometer is the tempting look-alike but measures humidity, a tachometer measures speed and an anemometer air velocity — hence 'none of the above'.
📖 §3.1 Energy forms — background from Book-1 Ch.1 Energy Scenario
40. A comparison of the trapping of heat by CO2 and CH4 is that
CH4 traps 21 times more heat in the atmosphere than does CO2
CO2 traps 21 times more heat in the atmosphere than does CH4
the same amount of heat is trapped by both CO2 and CH4
none of the above
Answer: A) CH4 traps 21 times more heat in the atmosphere than does CO2
Confirmed vs Book-1 §3.1 — Methane has a global warming potential of about 21 times that of CO2 over 100 years, i.e. CH4 traps 21 times more heat than the same mass of CO2.
📖 §5.8 Energy analysis and the Sankey diagram (Fig 5.9)
41. Diagrammatic representation of input and output energy streams of an equipment or system is known as
mollier diagram
sankey diagram
psychrometric chart
balance diagram
Answer: B) sankey diagram
Confirmed vs Book-1 §5.8: 'The Sankey diagram is a very useful tool to represent an entire input and output energy flow in any energy equipment or system', the width of each arrow being proportional to the flow. Hence it is the diagrammatic representation of input/output energy streams. Option (b).
📖 §4.1 Energy management (EnMS framework; ISO 50001 detail in Book-1 Ch6)
42. ISO 50001:2011 provides a framework of requirements for organizations to:
Develop a policy for more efficient use of energy
Measure the results
Fix targets and objectives to meet the policy
all of the above
Answer: D) all of the above
Confirmed vs Book-1 §4.1 — ISO 50001:2011 requires an organisation to develop an energy policy, fix objectives and targets to meet that policy, use data to support decisions, measure the results and review the policy — so (a), (b) and (c) are all required elements and 'all of the above' is the only complete answer.
43. In a chemical process two reactants A (300 kg) and B (400 kg) are used. If conversion is 50% and A and B react in equal proportions, the mass of the product formed is.
300 kg
350 kg
400 kg
none of the above
Answer: A) 300 kg
Confirmed vs Book-1 Ch.3 — A and B react in equal proportions, so A (300 kg) is limiting: only 300 kg of B can react. At 50% conversion, 150 kg of A reacts with 150 kg of B, giving 150 + 150 = 300 kg of product.
📖 §11.5 Wind Energy (Power available from the wind turbine)
44. What is the expected power output in watts from a wind turbine with 6m diameter rotor, a coefficient of performance 0.45, generator efficiency 0.8,a gear box efficiency 0.90 and wind speed of 11m/sec
4875 watts
1100 watts
7312 watts
73.12 kW
Answer: C) 7312 watts
Confirmed vs Book-1 §11.5 Wind Energy (Power available from the wind turbine) —
P = 0.5 × ρ × A × Cp × Ng × Nb × V³, with ρ = 1.2 kg/m³ and A = (π/4) × 6² = 28.27 m².
P = 0.5 × 1.2 × 28.27 × 0.45 × 0.8 × 0.90 × 11³ = 7,312 W.
(The book's own example with Cp = 0.30 gives 4,875 W; scaling 4875 × 0.45/0.30 = 7,312 W.) Answer c.