Power Plant Engineering - Interview Questions | Exam2Win

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26. The critical pressure ratio of a convergent nozzle is defined as

A. the ratio of outlet pressure to inlet pressure of nozzle

B. the ratio of inlet pressure to outlet pressure of nozzle

C. the ratio of outlet pressure to inlet pressure only when mass flow rate per unit area

D. nimum

Explanation:

27. The efficiency of chimney is approximately

A. 80%

B. 40%

C. 20%

D. 0.25%

Explanation:

28. The isentropic expansion of steam through nozzle for the steam initially superheated at inlet is approximated by equation

A. pvls=C

B. pv1126 = C

C. pv1A = C

D. pv = C

Explanation:

29. The draught in locomotive boilers is produced by

A. forced fan

B. chimney

C. steam jet

D. only motion of locomotive

Explanation:

30. The effect of considering friction in steam nozzles for the same pressure ratio leads to

A. increase in dryness fraction of exit steam

B. decrease in dryness fraction of exit steam

C. no change in the quality of exit steam

D. decrease or increase of dryness frac-tion of exit steam depending upon inlet

Explanation:

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