Compressors - Interview Questions | Exam2Win

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81. In a compressor, free air delivered is the actual volume delivered at the stated pressure reduced to

A. N.T.P. conditions

B. intake temperature and pressure conditions

C. 0�C and 1 kg/cm2

D. 20�C and 1 kg/cm2

E. none of the above.

Explanation:

82. The criterion of the thermodynamic efficiency for rotary compressor is

A. isentropic compression

B. isothermal compression

C. polytropic compression

D. any one of the above

E. none of the above.

Explanation:

83. As the value of index '�' is decreased, the volumetric efficiency will

A. increase

B. decrease

C. remain unaffected

D. may increase/decrease depending on compressor clearance

E. none of the above.

Explanation:

84. For minimum work in multistage compression, assuming same index of compression in all stages

A. work done in first stage should be more

B. work done in subsequent stages should increase

C. work done in subsequent stages should decrease

D. work done in all stages should be equal

E. work done in any stage is no criterion for minimum work but depends on other factors.

Explanation:

85. The volumetric efficiency of a compressor falls roughly as follows for every 5�C increase in atmospheric temperature

A. 0.1%

B. 0.5%

C. 1%

D. 5%

E. opt 5

Explanation: