power generation MCQs – Page 2

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

power generation Mcqs
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

61. For the same draught produced the power of induced draught fan as compared to forced draught fan is___________?
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A. not predictable

B. less

C. same

D. more
62. Reheat factor in steam turbines depends on______________?
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A. initial pressures and temperature only

B. stage efficiency only

C. exit pressure only

D. all of the above

63. Curtis turbine is_____________?
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A. velocity compounded impulse steam turbine

B. pressure compounded impulse steam turbine

C. reaction steam turbine

D. pressure velocity compounded steam turbine
64. The maximum percentage gain in Regenerative feed heating cycle thermal efficiency____________?
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A. none of the above

B. increases with number of feed heaters increasing

C. remains same unaffected by number of feed heaters

D. decreases with number of feed heaters increasing

65. The pressure on the two sides of the impulse wheel of a steam turbine_____?
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A. increases from one side to the other side

B. is different

C. is same

D. decreases from one side to the other side

66. Incase of reaction steam turbine___________?
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A. there is enthalpy drop both in fixed and moving blades

B. there is enthalpy drop only in fixed blades

C. there is enthalpy drop only in moving blades

D. none of the above

67. The draught produced by steel chimney as compared to that produced by brick chimney for the same height is_____________?
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A. same

B. less

C. more

D. may be more or less

68. Belt conveyer can be used to transport coal at inclinations upto____________?
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A. 60

B. 90

C. 80

D. 30
69. Secondary air is the air used to______________?
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A. increase the flame length

B. reduce the flame length

C. provide air round the burners for getting optimum combustion

D. transport and dry the coal

70. The efficiency of a modern boiler using coal and heat recovery equipment is about_____________?
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A. 25 to 30%

B. 40 to 50%

C. 85 to 90%

D. 65 to 70%

71. In jet type condensers___________?
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A. steam and cooling water do not mix

B. cooling water passes through tubes and steam surrounds them

C. steam passes through tubes and cooling water surrounds them

D. steam and cooling water mix
72. For Parsons reaction steam turbine, degree of reaction is____________?
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A. 60%

B. 50%

C. 75%

D. 100%

73. In a shell and tube surface condenser____________?
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A. cooling water passes through the tubes and steam surrounds them

B. all of the above varying with situation

C. steam and cooling water mix to give the condensate

D. steam passes through the cooling tubes and cooling water surrounds them

74. In a regenerative feed heating cycle, the greatest economy is affected___________?
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A. when steam is extracted from only one suitable point of steam turbine

B. when steam is extracted only from the last stage of steam turbine

C. when steam is extracted only from the first stage of steam turbine

D. when steam is extracted from several places in different stages of steam turbine
75. The maximum length of a screw conveyer is about___________?
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A. 100 metres

B. 30 metres

C. 60 metres

D. 40 metres

76. The draught in locomotive boilers is produced by_____________?
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A. forced fan

B. only motion of locomotive

C. steam jet

D. chimney

77. In a steam power plant, the function of a condenser is__________?
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A. to condense large volumes of steam to water which may be used again in boiler

B. to maintain pressure below atmospheric to increase work output from the primemover

C. to receive large volumes of steam exhausted from steam prime mover

D. all of the above
78. Rateau steam turbine is______________?
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A. pressure compounded impulse steam turbine

B. velocity compounded impulse steam turbine

C. pressure velocity compounded steam turbine

D. reaction steam turbine

79. The percentage O2 by Weight in atmospheric air is____________?
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A. 77%

B. 23%

C. 79%

D. 18%

80. In fuel cell, the ___________ energy is converted into electrical energy?
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A. heat

B. mechanical

C. chemical

D. sound

81. Pipes carrying steam are generally made up of_____________?
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A. aluminium

B. cast iron

C. steel

D. copper

82. The energy radiated by sun on a bright sunny day is approximately______________?
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A. 700 W/m2

B. 800 W/m2

C. 1 kW/m2

D. 2 kW/m2

83. Economisers improve boiler efficiency by__________?
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A. 10 to 12%

B. 4 to 10%

C. 1 to 5%

84. In a surface condenser if air is removed, there is___________?
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A. rise in absolute pressure maintained in condenser

B. rise in temperature of condensed steam

C. no change in absolute pressure in the condenser

D. fall in absolute pressure maintained in condenser
85. Bucket elevators are used for___________?
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A. carrying coal in horizontal direction

B. carrying coal in any direction

C. carrying coal in vertical direction
86. Steam turbines are governed by the following methods_____________?
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A. all of the above

B. Nozzle control governing

C. By-pass governing

D. Throttle governing

87. The critical pressure ratio of a convergent nozzle is defined as_____________?
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A. the ratio of outlet pressure to inlet pressure only when mass flow rate = c

B. the ratio of outlet pressure to inlet pressure of nozzle

C. the ratio of outlet pressure to inlet pressure only when mass flow rate per unit area is minimum

D. the ratio of inlet pressure to outlet pressure of nozzle

88. Steam turbines commonly used in steam power station are__________?
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A. none of the above

B. non-condensing type

C. condensing type
89. Artificial draught is produced by______________?
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A. induced fan

B. induced and forced fan

C. all of the above

D. forced fan

90. The overall efficiency of thermal power plant is equal to____________?
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A. Boiler efficiency x turbine efficiency x generator efficiency

B. Rankine cycle efficiency

C. Carnot cycle efficiency

D. Regenerative cycle efficiency
91. The modern steam turbines are___________?
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A. impulse-reaction turbines

B. reaction turbines

C. none of the above

D. impulse turbines

92. The commercial sources of energy are____________?
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A. solar, wind and biomass

B. none of the above

C. wood, animal wastes and agriculture wastes

D. fossil fuels, hydropower and nuclear energy
93. In Rankine cycle the work output from the turbine is given by__________?
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A. change of enthaply between inlet and outlet

B. change of internal energy between inlet and outlet

C. change of entropy between inlet and outlet

D. change of temperature between inlet and outlet

94. Binaryvapour cycles are used to_____________?
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A. increase the performance of the condenser

B. increase the efficiency of the plant

C. increase efficiency of the turbine

95. The efficiency of chimney is approximately______________?
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A. 80%

B. 0.25%

C. 20%

D. 40%

96. A steam power station requires space______________?
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A. less than diesel power station

B. equal to diesel power station

C. more than diesel power station
97. Blowing down of boiler water is the process_____________?
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A. to reduce the boiler pressure

B. to increase the steam temperature

C. to control the solid concentration in the boiler water by removing some of the concentrated saline water

D. none of the above

98. Reheat cycle in steam power plant is used to________________?
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A. increase thermal efficiency

B. reduce loss of heat

C. utilise heat of flue gases

D. improve condenser performance

99. TravelUng grate stoker can burn coals at the rates of____________?
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A. 75100 kg/m per hour

B. 150200 kg/m2 per hour

C. 5075 kg/m per hour

D. 100150 kg/m per hour

100. The draught produced, for a given height of the chimney and given mean temperature of chimney gases_______________?
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A. increases with increase in outside air temperature

B. may increase or decrease with increase in outside air temperature

C. decreases with increase in outside air temperature

D. remains the same irrespective of outside air temperature