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power generation MCQs

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

power generation Mcqs
1. If the load factor of a power station is high then its cost of generation will be_______?
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A. High.

B. Low.

C. Depend upon plant type.

D. Remain same.

2. Annual operating expenditure of a power plant consists of_________?
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A. running charges

B. semi-fixed charges

C. all of the above

D. fixed charges

3. Load factor of a power station is defined as____________?
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A. average load/maximum demand

B. average load x maximum demand

C. maximum demand/average load

D. none of the above

4. Which of the following Power Plant causes least environmental pollution____________?
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A. Hydro Power Plant

B. Thermal Power Plant

C. Diesel Power Plant

D. Nuclear Power Plant

5. Which of the following generating station has minimum running cost?
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A. Nuclear

B. Diesel

C. Thermal

D. Hydro
6. Which of the following is usually not the generating voltage__________?
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A. 9.9 kV

B. 11kV

C. 6.6 kV

D. 13.2kV

7. At low value of power factor, the cost of generation of a power station will be____________?
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A. low

B. high

C. none of the above

D. remain same

8. If the diversity factor of a power station is high then its generation cost is___________?
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A. high

B. low

C. remain same

D. depend on the plan type

9. Which of the following device is used to measure vacuum?
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A. Hygrometer

B. Barometer

C. U-tube manometer

D. Venturi metre

10. Which of the following power plant has least fuel transportation______________?
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A. diesel generating plants

B. nuclear power plants

C. steam power stations

D. thermal power plants

11. Compounding of steam turbine is done for_______________?
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A. balancing the turbine

B. reducing the rotor speed

C. reducing the work done

D. increasing the rotor speed

12. Demand factor is defined as___________?
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A. connected load/maximum demand.

B. average load/maximum load.

C. maximum demand/connected load

D. average load x maximum load

13. Load curve is useful in deciding the__________?
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A. sizes of generating units

B. A. operating schedule of generating units

C. total installed capacity of the plant

D. all of the above
14. Which of the following load is responsible for lower power factor of supply system__________?
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A. synchronous Motors

B. all of the above

C. induction motors

D. resistive loads

15. Which of the following power plant usually offer highest maintenance cost___________?
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A. Hydro-electric power plants

B. Thermal power plants

C. Diesel engine power plant

D. Nuclear power plants

16. In hydro power plant, the graph between discharge and time is known as___________?
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A. monograph.

B. discharge graph.

C. load graph.

D. hydro graph
17. Which of the following power plant has highest Depreciation charges?
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A. All have same

B. Thermal plant

C. Diesel plant

D. Hydroelectric plant

18. The value of the reheat factor is of the order of_____________?
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A. 1.0 to 1.05

B. 0.8 to 1.0

C. above 1.5

D. 1.1 to 1.5
19. In thermal power plant, heat from the flue gases is utilized in___________?
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A. chimney

B. super heater

C. economizer

D. condenser

20. Which material is used to made a solar cell_______________?
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A. scandium

B. silicon

C. aluminum

D. Germanium

21. A gas turbine basically work on
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A. Dual cycle

B. Rankin cycle

C. Brayton cycle

D. Carnot cycle

22. One kilowatt hour is equal to_________?
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A. 735 k cal.

B. 860 k cal.

C. 746 k cal.

D. 532 k cal.

23. The ideal load factor should be_____________?
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A. negative.

B. infinity.

C. zero

D. unity
24. Diesel power plant are generally used as___________?
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A. base load plant

B. peak load plant

C. standby plant

D. none of the above

25. The overall efficiency of a steam power station is ________ its thermal efficiency.
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A. none of the above

B. greater than

C. less than

D. equal to

26. Which of the following power plant has least efficiency_________?
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A. Steam power plant

B. Hydro power plant

C. Diesel power plant

D. Nuclear power plant

27. The fuel used in nuclear reactor is_____________?
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A. all of the above

B. cadmium

C. radium

D. uranium
28. The voltage of a single solar cells is about
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A. 1. 5 volt

B. 1 volt

C. 1.8 volt

D. 0.5 volt
29. A steam power stations basically work on the______________?
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A. thermodynamic cycle

B. Vapor pressure cycle

C. Carton cycle

D. Rankin cycle
30. The percentage 02 by volume in atmosphere air is____________?
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A. 77%

B. 79%

C. 21%

D. 23%

31. The cooling section in the surface condenser__________?
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A. does not affect vapour quantity extracted but reduces pump capacity of air extraction pump

B. increases the quantity of vapour extracted along with air

C. reduces the quantity of vapour extracted along with air

D. none of the above

32. The ratio of exit pressure to inlet pressure for maximum mass flow rate per unit area of steam through a nozzle when steam is initially dry saturated is___________?
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A. 0.555

B. 0.6

C. 0.5457

D. 0.578
33. The pressure at the furnace is minimum in case of___________?
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A. forced draught system

B. natural draught system

C. balanced draught system

D. induced draught system

34. The amount of air which is supplied for complete combustion is called___________?
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A. primary air

B. tertiary air

C. secondary air
35. Load carrying capacity of belt conveyor is about___________?
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A. 100 to 150 tonnes/hr

B. 20 to 40 tonnes/hr

C. 50 to 100 tonnes/hr

D. 150 to 200 tonnes/hr

36. The isentropic expansion of steam through nozzle for the steam initially superheated at inlet is approximated by equation__________?
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A. pv = C

B. pv1126 = C

C. pv1A = C

D. pvls=C
37. The proper indication of incomplete combustion is_______________?
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A. high CO content in flue gases at exit

B. high CO2 content in flue gases at exit

C. the smoking exhaust from chimney

D. high temperature of flue gases

38. The value of reheat factor normally varies from___________?
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A. 1.02 to 1.06

B. 0.9 to 0.95

C. 1.2 to 1.6

D. 0.5 to 0.6

39. Economiser is used to heat_____________?
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A. all above

B. air

C. feed water

D. flue gases

40. Where unpulverised coal has to be used and boiler capacity is large, the stoker which is used is______________?
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A. underfeed stoker

B. overfeed stoker

C. any

41. Rankine cycle efficiency of a good steam power plant may be in the range of____________?
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A. 35 to 45 per cent

B. 70 to 80 per cent

C. 15 to 20 per cent

D. 90 to 95 per ceut

42. In case of impulse steam turbine_____________?
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A. there is enthalpy drop only in moving blades

B. there is enthalpy drop in nozzles

C. there is enthalpy drop in fixed and moving blades

D. none of the above

43. In _________ system fuel from a central pulverizing unit is delivered to a bunker and then to the various burners?
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A. unit

B. none of the above

C. central
44. Caking coals are those which__________?
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A. do not form ash

B. burn completely

C. burn freely

D. form lumps or masses of coke
45. Steam pressure in a steam power station, which is usually kept now-a-days is of the order of____________?
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A. 50 kgf/cm2

B. 100 kgf/cm2

C. 20 kgf/cm2

D. 150 kgf/cm2
46. The thermal efficiency of the engine with condenser as compared to without condenser, for a given pressure and temperature of steam, is_____________?
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A. lower

B. higher

C. none of the above

D. same as long as initial pressure and temperature is unchanged

47. For the safety of a steam boiler the number of safety valves fitted are____________?
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A. one

B. four

C. two

D. three

48. Carnot cycle comprises of_______?
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A. two isothermal processes and three constant pressure processes

B. none of the above

C. two isentropic processes and two constant pressure processes

D. two isentropic processes and two constant volume processes

49. Under-feed stokers work best for _________ coals high in volatile matter and with caking tendency?
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A. anthracite

B. lignite

C. semibituminous and bituminous
50. The capacity of large turbo-generators varies from___________?
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A. 20 to 100 MW

B. 50 to 300 MW

C. 70 to 400 MW

D. 100 to 650 MW