power generation MCQs – Page 5

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

power generation Mcqs
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