Compressors - Interview Questions | Exam2Win

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66. Pick up the wrong statement about advantages of multistage compression

A. better lubrication is possible advantages of multistage

B. more loss of air due to leakage past the cylinder

C. mechanical balance is better

D. air can be cooled perfectly in between

E. more uniform torque, light cylinder and saving in work.

Explanation:

67. For a compressor, least work will be done if the compression is

A. is entropic

B. isothermal

C. poly tropic

D. somewhere in between is entropic and isothermal

E. none of the above.

Explanation:

68. For slow-speed large capacity compressor, following type of valve will be best suited

A. poppet valve

B. mechanical valve of the corliss, sleeve, rotary or semirotary type

C. disc or feather type

D. any of the above

E. none of the above.

Explanation:

69. More than one stage will be preferred for reciprocating compressor if the delivery pressure is more than

A. 2 kg/cm2

B. 6 kg/cm2

C. 10 kg/cm2

D. 14.7 kg/cm2

E. none of the above.

Explanation:

70. The ratio of isentropic work to Euler work is known as

A. pressure coefficient

B. work coefficient

C. polytropic reaction

D. slip factor

E. compressor efficiency.

Explanation: