Exercise: Compressors Gas Dynamics And Gas Turbines

Questions for: Compressors Gas Dynamics And Gas Turbines

Which of the following statement is correct as regard to centrifugal compressors?
A:
The flow of air is parallel to the axis of the compressor.
B:
The static pressure of air in the impeller increases in order to provide centripetal force on the air.
C:
The impeller rotates at high speeds.
D:
The maximum efficiency is higher than multi-stage axial flow compressors.
Answer: B
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The axial flow compressor is preferred in air-craft gas turbines because of
A:
low frontal area
B:
higher thrust
C:
high pressure rise
D:
none of these
Answer: A
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In a single acting reciprocating air compressor, without clearance, the compression of air may be
A:
isothermal
B:
polytropic
C:
isentropic
D:
any one of these
Answer: D
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In a jet engine, the compression varies as the square of the speed.
A:
Correct
B:
Incorrect
C:
D:
Answer: A
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The overall efficiency of the compressed air system is the
A:
ratio of shaft output of the air motor to the shaft input to the compressor
B:
ratio of shaft input to the compressor to the shaft output of air motor
C:
product of shaft output of air motor and shaft input to the compressor
D:
none of the above
Answer: A
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