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:
|
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:
|
23. |
The discharge is __________ at critical pressure. |
Answer: Option C
Explanation:
|
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:
|
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:
|