Mechanical Engineering - Steam Nozzles and Turbines

Exercise :: Steam Nozzles and Turbines - Section 3

21. 

In velocity compounding of an impulse turbine, the expansion of steam takes place in a nozzle or a set of nozzles from the boiler pressure to condenser pressure.

A. True
B. False

Answer: Option A

Explanation:

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22. 

The critical pressure ratio is given by (where p1 = Initial pressure of steam, and p2 = Pressure of steam at throat or critical pressure)

A. p1 p2
B. p1/p2
C. p2/p1
D. p1 + p2

Answer: Option C

Explanation:

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23. 

A steam turbine, in which a part of the steam after partial expansion, is used for process heating and the remaining steam is further expanded for power generation, is known as

A. back pressure turbine
B. pass out turbine
C. low pressure turbine
D. impulse turbine

Answer: Option B

Explanation:

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24. 

The stage efficiency is the ratio of energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam.

A. True
B. False

Answer: Option B

Explanation:

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25. 

Stage efficiency is also known as

A. diagram efficiency
B. nozzle efficiency
C. gross efficiency
D. none of these

Answer: Option C

Explanation:

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