Mechanical Engineering - Steam Nozzles and Turbines

Exercise :: Steam Nozzles and Turbines - Section 1

31. 

The critical pressure ratio (p2/p1) is given by

A.
B.
C.
D.

Answer: Option B

Explanation:

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32. 

In reaction turbines, the axial thrust is due to

A. pressure drop across the rotor
B. change in axial velocity
C. both (a) and (b)
D. none of these

Answer: Option C

Explanation:

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33. 

Which of the following statement is correct?

A. The expansion of steam in a nozzle follows Rankine cycle.
B. The friction in the nozzle increases the dryness fraction of steam.
C. The pressure of steam at throat is called critical pressure.
D. all of the above

Answer: Option D

Explanation:

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34. 

A binary vapour plant consists of

A. steam turbine
B. steam condenser
C. mercury boiler
D. all of these

Answer: Option D

Explanation:

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35. 

In a De-Laval nozzle expanding superheated steam from 10 bar to 0.1 bar, the pressure at the minimum cross-section (i. e. pressure at throat, p2) will be

A. 3.3 bar
B. 5.46 bar
C. 8.2 bar
D. 9.9 bar

Answer: Option B

Explanation:

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