Mechanical Engineering - Steam Nozzles and Turbines
Exercise :: Steam Nozzles and Turbines - Section 2
| 1. |
A single stage impulse turbine with a diameter of 1.2 m runs at 3000 r.p.m. If the blade speed ratio is 0.42, then the inlet velocity of steam will be |
Answer: Option C
Explanation:
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| 2. |
In a De-Laval impulse turbine, the nozzle is kept very close to the blades. |
Answer: Option A
Explanation:
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| 3. |
The flow of steam is super-sonic |
| A. |
at the entrance to the nozzle | | B. |
at the throat of the nozzle | | C. |
in the convergent portion of the nozzle | | D. |
in the divergent portion of the nozzle |
Answer: Option D
Explanation:
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| 4. |
The pressure of steam at throat of a steam nozzle is called critical pressure. |
Answer: Option A
Explanation:
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| 5. |
For maximum efficiency of an impulse turbine, the steam should leave the blades at right angles to their motion. |
Answer: Option A
Explanation:
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