power generation MCQs – Page 3

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

power generation Mcqs
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

51. The draught produced by chimney of given height at given outside temperature___________?
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A. decreases if the chimney gas temperature increases

B. increases if the chimney gas temperature increases

C. remains same irrespective of chimney gas temperature

D. may increase or decrease

52. In a regenerative feed heating cycle, the optimum value of the fraction of steam extracted for feed heating________________?
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A. is unaffected by increase in Rankine cycle efficiency

B. decreases with increase in Rankine cycle efficiency

C. none of the above

D. increases with increase in Rankine cycle efficiency
53. Deaerative heating is done to_____________?
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A. remove dissolved gases in the water

B. heat the air in the water

C. heat the water

D. erative heating is done to

54. In regenerative cycle feed water is heated by_____________?
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A. exhaust gases

B. heaters

C. draining steam from the turbine

D. all above

55. The main source of production of biogas is__________________?
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A. all above

B. human waste

C. wet cow dung

D. wet livestock waste

56. The artificial draught normally is designed to produce____________?
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A. less smoke

B. all of the above

C. more draught

D. less chimney gas temperature

57. Method which is commonly applied for unloading the coal for small power plant is___________?
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A. lift trucks

B. belt conveyor

C. coal accelerators

D. tower cranes

58. For forced draught system, the function of chimney is mainly_____________?
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A. to produce draught to accelerate the combustion of fuel

B. to reduce the temperature of the hot gases discharged

C. none of the above

D. to discharge gases high up in the atmosphere to avoid hazard
59. In a regenerative surface condenser_____________?
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A. there are three pumps to remove air, vapour and condensate

B. there are two pumps to remove air and condensate

C. there is no pump, the condensate gets removed by gravity

D. there is one pump to remove air and condensate

60. Load center in a power station is___________?
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A. center of coal fields

B. center of gravity of electrical system

C. center of maximum load of equipments