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Compressors - Interview Questions and Answers

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76. The- most efficient method of compressing air is to compress it
A. isothermally
B. adiabatically
C. isentropically
D. isochronically
E. as per law pV
Explanation:
77. The volumetric efficiency of a compressor is calculated on the basis of
A. volume of air inhaled at working conditions
B. volume of air inhaled at N.T.P. conditions
C. volume at 0�C and 1 kg/cm2
D. volume at 20�C and 1 kg/cm2
E. none of the above.
Explanation:
78. Diffuser in a compressor is used to
A. increase velocity
B. make the flow stream-line
C. convert pressure energy into kinetic energy
D. convert kinetic energy into pressure energy
E. increase degree of reaction.
Explanation:
79. The indicated work per unit mass of air delivered is
A. directly proportional to clearance volume
B. greatly affected by clearance volume
C. not affected by clearance volume
D. inversely proportional to clearance volume
E. opt 5
Explanation:
80. The volumetric efficiency of a compressor falls roughly as follows for every 100 m increase in elevation
A. 0.1%
B. 0.5%
C. 1.0%
D. 5%
E. 10%.
Explanation:
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