Mechanical Engineering - Steam Nozzles and Turbines

Exercise :: Steam Nozzles and Turbines - Section 1

21. 

When the back pressure of a nozzle is below the designed value of pressure at exit of nozzle, the nozzle is said to be

A. choked
B. underdamping
C. overdamping
D. none of these

Answer: Option B

Explanation:

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22. 

The ratio of the workdone on the blades to the energy supplied to the blades, is called

A. blading efficiency
B. nozzle efficiency
C. gross or stage efficiency
D. mechanical efficiency

Answer: Option A

Explanation:

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23. 

The discharge is __________ at critical pressure.

A. zero
B. minimum
C. maximum

Answer: Option C

Explanation:

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24. 

The supersaturated flow of steam through a nozzle as compared to a stable flow, the available heat drop

A. remains the same
B. increases
C. decreases
D. is unpredictable

Answer: Option C

Explanation:

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25. 

The steam leaves the nozzle at a

A. high pressure and a low velocity
B. high pressure and a high velocity
C. low pressure and a low velocity
D. low pressure and a high velocity

Answer: Option D

Explanation:

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