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. |
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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