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Compressors - Interview Questions and Answers

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21. Producer gas is produced by
A. carbonation of coal
B. passing steam over incandescent coke
C. passing air and a large amount of steam over waste coal at about 65�C
D. partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
E. same way as the natural gas.
Explanation:
22. In the axial flow gas turbine, the work ratio is the ratio of
A. compressor work and turbine work
B. output and input
C. actual total head temperature drop to the entropic total head drop from total head inlet to static head outlet
D. actual compressor work and theoretical compressor work
E. none of the above.
Explanation:
23. Gas turbines use following type of air compressor
A. centrifugal type
B. reciprocating type
C. lobe type
D. axial flow type
E. none of the above.
Explanation:
24. Adiabatic compression is one in which
A. temperature during compression remains constant
B. no heat leaves or enters the compressor cylinder during compression
C. temperature rise follows a linear relationship
D. work done is maximum
E. entropy decreases.
Explanation:
25. Cylinder clearance in a compressor should be
A. as large as possible
B. as small as possible
C. about 50% of swept volume
D. about 100% of swept volume
E. none of the above.
Explanation:
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