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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
79 m/s
188 m/s
450 m/s
900 m/s
Answer: Option
Explanation:
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2.
In a De-Laval impulse turbine, the nozzle is kept very close to the blades.
Yes
No
Answer: Option
Explanation:
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3.
The flow of steam is super-sonic
at the entrance to the nozzle
at the throat of the nozzle
in the convergent portion of the nozzle
in the divergent portion of the nozzle
Answer: Option
Explanation:
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4.
The pressure of steam at throat of a steam nozzle is called critical pressure.
Agree
Disagree
Answer: Option
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.
Correct
Incorrect
Answer: Option
Explanation:
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