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Compressors - Interview Questions and Answers

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86. Losses in a centrifugal compressor are due to
A. inlet losses
B. impeller channel losses
C. diffuser losses
D. all of the above
E. none of the above
Explanation:
87. Ratio of indicated H.P. and brake H.P. is known as
A. mechanical efficiency
B. volumetric efficiency
C. isothermal efficiency
D. adiabatic efficiency
E. relative efficiency.
Explanation:
88. The thermodynamic efficiency of rotary compressor is based on
A. isothermal compression
B. adiabatic compression
C. isentropic compression
D. polytropic compression
E. none of the above.
Explanation:
89. Which is false statement about advantages of multistage compressor in comparison to single stage compressor
A. less power requirement
B. better mechanical balance
C. less loss of air due to leakage past the cylinder
D. more effective lubrication
E. lower volumetric efficiency.
Explanation:
90. The advantage of multistage compression over single stage compression is
A. lower power consumption per unit of air delivered
B. higher volumetric efficiency
C. decreased discharge temperature
D. moisture free air
E. all of the above.
Explanation:
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