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Compressors - Interview Questions and Answers

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106. The maximum compression ratio in an actual single stage axial flow compressor is of the order of
A. 1 : 1.2
B. 1 : 2
C. 1 : 5
D. 1 : 10
E. 1 : 1
Explanation:
107. Surging is the phenomenon of
A. air stream blocking the passage
B. motion of air at sonic velocity
C. unsteady, periodic and reversed flow
D. air stream not able to follow the blade contour
E. production of no air pressure.
Explanation:
108. Actual compression curve is
A. same as isothermal
B. same as adiabatic
C. better than isothermal and adiabatic
D. in between isothermal and adiabatic
E. none of the above.
Explanation:
109. The overall isothermal eiffciency of compressor is defined as the ratio of
A. isothermal h.p. to the BHP of motor
B. isothermal h.p. to adiabatic h.p.
C. power to drive compressor to isothermal h.p.
D. work to compress air isothermally to work for actual compression
E. isothermal work to ideal work.
Explanation:
110. The pressure ratio for an open cycle gas turbine compared to closed cycle gas turbine of same h.p. is
A. low
B. high
C. same
D. low/high depending on make and type
E. unpredictable.
Explanation:
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