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

A. 79 m/s
B. 188 m/s
C. 450 m/s
D. 900 m/s

Answer: Option C

Explanation:

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2. 

In a De-Laval impulse turbine, the nozzle is kept very close to the blades.

A. Yes
B. No

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.

A. Agree
B. Disagree

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.

A. Correct
B. Incorrect

Answer: Option A

Explanation:

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