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Compressors - Interview Questions and Answers

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71. For a two stage compressor* if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will
A. increase
B. decrease
C. remain unaffected
D. other factors control it
E. unpredictable.
Explanation:
72. During base load operation, the best method of controlling compressor is
A. start-stop motor
B. constant speed unloaded
C. relief valve
D. variable speed
E. none of the above.
Explanation:
73. For supplying intermittent small quantity of air at high pressure, following compressor is best suited
A. centrifugal
B. reciprocating
C. axial
D. screw
E. turbo jet.
Explanation:
74. The ratio of outlet whirl velocity to blade velocity in case of centrifugal compressor is called
A. slip factor
B. velocity factor
C. velocity coefficient
D. blade effectiveness
E. opt 5
Explanation:
75. The ratio of isentropic work to euler's work is known as
A. compressor efficiency
B. isentropic efficiency
C. Euler's efficiency
D. pressure coefficient
E. pressure ratio.
Explanation:
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