compressors gas turbines and jet engines MCQs – Page 6

Practise focused compressors gas turbines and jet engines questions with marked answers for exam preparation and subject revision.

compressors gas turbines and jet engines Mcqs
101. Gas turbine works on_______________?
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A. Erricsson cycle

B. Brayton or Atkinson cycle

C. Rankine cycle

D. Joule cycle

E. Carnot cycle

102. Gas turbine works on______________?
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A. Brayton or Atkinson cycle

B. Joule cycle

C. Carnot cycle

D. Erricsson cycle

E. Rankine cycle

103. Diffuser in a compressor is used to _____________________?
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A. increase degree of reaction

B. increase velocity

C. convert kinetic energy into pressure energy

D. make the flow stream-line

E. convert pressure energy into kinetic energy

104. Turbo propeller has the following additional feature over the turbojet __________________?
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A. intercooler

B. peopeller

C. diffuser

D. starting engine

E. turbine and combustion chamber

105. To avoid moisture troubles, the branch connections from compressed air lines should be taken from_________________?
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A. any location

B. bottom side of main

C. top side of main

D. left side of main

E. right side of main

106. Volumetric efficiency of a compressor with clearance volume ________________?
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A. decreases with increase in compression ratio

B. may increase/decrease depending on compressor capacity

C. in not dependent upon compression ratio

D. increases with increase in compression ratio

E. unpredictable

107. Gas turbine cycle with Regenerator __________________?
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A. permits high moisture content fuel to be used

B. decreases heat loss is exhaust

C. allows operation at very high altitudes

D. increases thermal efficiency

E. allows high compression ratio

108. The area of actual indicator diagram on an air compressor as compared to area of ideal indicator diagram is_____________________?
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A. same

B. less

C. unpredictable

D. more/less depending on compressor capacity

E. more
109. The capacity of a compressor is 5 m /mih. 5 m /min refers to_______________?
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A. free air

B. air sucked

C. standard air

D. compressed air at delivery pressure

E. compressed air

110. Pressure ratio in gas turbines is the ratio of ____________________?
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A. inlet pressure to exhaust pressure

B. compressor pressure ratio

C. pressures across the turbine

D. highest pressure to exhaust pressure

E. none of the above

111. Ratio of indicated H.P. and brake H.P. is known as_________________?
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A. mechanical efficiency

B. relative efficiency

C. adiabatic efficiency

D. isothermal efficiency

E. volumetric efficiency

112. The closed cycle in gas turbines_________________?
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A. in never used

B. is used when gas is to be burnt

C. provides greater flexibility

D. provides lesser flexibility

E. none of the above

113. Volumetric efficiency of a compressor without clearance volume________________?
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A. may increase/decrease depending on compressor capacity

B. is not dependent upon compressin ratio

C. unpredictable

D. decreases with increase in compression ratio

E. increases with increase in compression ratio

114. The jnaximum combustion pressure in gas turbine as compared to I.C. engine is_________________?
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A. less

B. unpredictable

C. more

D. same

E. depends on other factors

115. In which case the air-fuel ratio is likely to be maximum _________________?
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A. 2-stroke engine

B. gas turbine

C. 4-stroke diesef engine

D. multi-cylinder engine

E. 4-stroke petrol engine

116. Axial flow compressor has the following advantage over centrifugal compressor__________________?
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A. none of the above

B. aerofoil blades are used

C. higher average velocities

D. larger air handling ability per unit frontal area

E. higher pressure ratio per stage

117. In jet propulsion power unit, the inlet duct of diverging shape is used in order to _______________ ?
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A. provide robust structure

B. collect more air

C. beautify the shape

D. convert kinetic energy of air into pres-sure energy

E. none of the above

118. Gas turbines for power generaion are normally used___________________?
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A. when other sources of power fail

B. in emergency

C. to enable start thermal power plant

D. to supply peak load requirements

E. to supply base load requirements

119. Pick up the correct statement ?
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A. gas turbine uses low air-fuel ratio to develop the high thrust required

B. gas turhine uses high air-fuel ratio to reduce outgoing temperature

C. gas turbine uses low air-fuel ratio to economise on fuel

D. none of the above

E. all of the above

120. Isothermal compression effeicency can be attained by running the compressor__________________?
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A. at very high speed

B. at zero speed

C. at average speed

D. isothermally

E. at very slow speed