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economics of power generation MCQs

Practise focused economics of power generation questions with marked answers for exam preparation and subject revision.

economics of power generation Mcqs
1. In Hopkinson demand rate or two part tariff the demand rate or fixed charges are__________?
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A. dependent upon the energy consumed

B. dependent upon the maximum demand of the consumer

C. both A and B

D. neither A nor B

2. For a consumer the most economical power factor is generally____________?
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A. 0.5 lagging

B. 0.95 lagging

C. 0.5 leading

D. 0.95 leading

3. The knowledge of diversity factor helps in determining__________?
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A. average load

B. kWh generated

C. peak load

D. plant capacity
4. Which of the following is the disadvantage of a synchronous condenser?
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A. High maintenance cost

B. All of the above

C. Continuous losses in motor

D. Noise

5. The expected useful life of an hydroelectric power station is around_________________?
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A. 60 years

B. 100 years

C. 15 years

D. 30 years

6. The load factor of domestic load is usually____________?
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A. 30 to 40%

B. 10 to 15%

C. 60 to 70%

D. 50 to 60%

7. Which lightening stroke is most dangerous?
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A. Indirect stroke on conductor

B. Direct stroke on tower top

C. Direct stroke on ground wire

D. Direct stroke on line conductor
8. Annual instalment towards depreciation reduces as rate of interest increases with______________?
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A. straight line depreciation

B. none of the above

C. reducing balances depreciation

D. sinking fund depreciation
9. Generating capacity connected to the bus bars and ready to take load when switched on is known as____________?
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A. spinning reserve

B. cold reserve

C. hot reserve

D. firm power

10. Most efficient plants are normally used as____________?
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A. base load plants

B. none of the above

C. peak load plants

D. either A. or (b)

11. In a distribution system, in order to improve power factor, the synchronous capacitors are installed__________?
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A. either A. or (b)

B. at the sending end

C. none of the above

D. at the receiving end
12. An alternator coupled to a __________ runs at slow speed, as compared to as compared to others.
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A. hydraulic turbine

B. gas turbine

C. diesel engine

D. steam turbine

13. A consumer has to pay lesser fixed charges in____________?
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A. two part tariff

B. flat rate tariff

C. any of the above

D. maximum demand tariff
14. Approximate estimation of power demand can be made by_____________?
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A. economic parameters

B. load survey method

C. statistical methods

D. mathematical method

E. all of the above
15. When the demand of consumers is not met by a power plant, it will resort to which of the following?
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A. Load shedding

B. Power factor improvement at the , generators

C. Penalising high load consumers by increasing the charges for electricity

D. Efficient plant operation

16. For high value of diversity factor, a power station of given installed capacity will be in a position to supply?
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A. neither A. nor B.

B. less number of consumers

C. either A. or B.

D. more number of consumers
17. Low power factor is usually not due to___________?
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A. fluorescent tubes

B. induction motors

C. incandescent lamp

D. arc lamps

18. Which of the following is the essential requirement of peak load plant ?
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A. It should produce high voltage

B. It should be small in size

C. It should be capable of starting quickly

D. It should run at high speed

19. Which of the following component, in a steam power plant, needs maximum maintenance attention?
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A. Steam turbine

B. Condenser

C. Water treatment plant

D. Boiler
20. Which of the following is not a source of power?
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A. Photovoltaic cell

B. Photoelectric cell

C. Solar cell

D. Thermocouple
21. Load curve helps in deciding___________?
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A. all of the above

B. sizes of the generating units

C. total installed capacity of the plant

D. operating schedule of generating units

22. In whichof the following power plants the maintenance cost is usually high?
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A. Diesel engine power plants

B. Thermal power plants

C. Nuclear power plant

D. Hydro-electric power plants

23. The connected load of a IVMIM uir consumer is around___________?
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A. 120 kW

B. 80 kW

C. 5 kW

D. 40 kV

24. In a load curve the highest point represents______________?
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A. average demand

B. diversified demand

C. none of the above

D. peak demand
25. High load factor indicates
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A. either of the above

B. none of the above

C. average power used during the period

D. average kWh (kW) energy consumption during the period
26. The efficiency of a plant is of least concern when it is selected as___________?
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A. casual run plant

B. peak load plant

C. base load plant

D. either A. or (b)
27. Which of the following should be used for extinguishing electrical fires?
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A. CO2 fire extinguisher

B. Foam type fire extinguisher

C. Carbon tetrachloride fire extinguisher

D. Water

28. An induction motor has relatively high power factor at__________?
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A. 20 percent load

B. near full load

C. no load

D. rated r.p.m.

29. __________ is invariably used for peak load
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A. Pumped storage plant

B. None of the above

C. Nuclear power plant

D. Steam turbine plant

30. Large capacity generators are invariably___________?
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A. forced air cooled

B. water cooled

C. natural air cooled

D. hydrogen cooled
31. A pilot exciter is provided on generators for which of the following reasons?
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A. To provide requisite starting torque to generator

B. None of the above

C. To excite the poles of main exciter

D. To provide requisite starting torque to main exciter

32. In two part tariff, variation in load factor will affect____________?
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A. fixed charges

B. operating or running charges

C. both A. and (b)

D. either A. or (b)

33. By the use of which of the following power factor can be improved?
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A. Static capacitors

B. Phase advancers

C. Synchronous compensators

D. Any of the above
34. Ships are generally powered by___________?
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A. diesel engines

B. none of the above

C. hydraulic turbines

D. nuclear power plants

E. steam accumulators

35. A synchronous condenser is virtually which of the following?
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A. Over excited synchronous motor

B. Induction motor

C. Under excited synchronous motor

D. D.C. generator

36. Depreciation charges are high in case of__________?
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A. thermal plant

B. hydroelectric plant

C. diesel plant

D. none of these

37. An over excited synchronous motor on no load is known as__________?
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A. alternator

B. synchronous condenser

C. generator

D. induction motor

38. In a power plant if the maximum demand on the plant is equal to the plant capacity, then
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A. diversity factor will be unity

B. plant reserve capacity will be zero

C. load factor will be nearly 60%

D. load factor will be unity

39. Which plant can never have 100 percent load factor?
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A. Peak load plant

B. Nuclear power plant

C. Base load plant

D. Hydro electric plant

40. In case of _________ fuel transportation is the major problem.
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A. thermal power plants

B. diesel power plants

C. hydro-electric power plants

D. nuclear power plants

41. __________ will be least affected due to charge in supply voltage frequency.
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A. Mixer grinder

B. Room heater

C. Electric clock

D. Ceiling fan

42. Which of the following is not an operating cost?
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A. Fuel cost

B. Maintenance cost

C. Salaries of high officials

D. Salaries of operating staff

43. A nuclear power plant is invariably used as a__________?
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A. spinning reserve plant

B. peak load plant

C. stand-by plant

D. any of the above

E. base load plant
44. Static capacitors are rated in terms of_____________?
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A. kWh

B. none of the above

C. kW

D. kVAR
45. The area under a load curve gives__________?
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A. average demand

B. maximum demand

C. energy consumed

D. none of the above

46. Which of the following power plants need the least period for installation ?
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A. Diesel power plant

B. Hydro-electric power plant

C. Thermal power plant

D. Nuclear power plant

47. Which of the following devices may be used to provide protection against lightening over voltages?
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A. Horn gaps

B. Rod gaps

C. All of the above

D. Surge absorbers

48. In _________ fuel transportation cost is least.
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A. nuclear power plants

B. None

C. steam power stations

D. diesel generating plants

49. Different generating stations use following prime movers?
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A. any of the above

B. diesel engine

C. gas turbine

D. steam turbine

E. hydraulic turbine

50. Direct conversion of heat into electric power is possible through__________?
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A. thermionic converter

B. fuel cell

C. all of the above

D. batteries