Mechanical Engineering - Steam Nozzles and Turbines

Exercise :: Steam Nozzles and Turbines - Section 3

1. 

Steam turbines may be classified according to

A. direction of steam flow
B. number of stages
C. mode of steam action
D. all of these

Answer: Option D

Explanation:

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2. 

The process of draining steam from the turbine, at certain points during its expansion and using this steam for heating the feed water in feed water heaters and then supplying it to the boiler is known as

A. regenerative heating
B. reheating of steam
C. bleeding
D. none of these

Answer: Option C

Explanation:

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3. 

In a 50% reaction turbine stage, tangential component of absolute velocity at rotor inlet is 537 m/s and the blade velocity is 454 m/s. The power output in kW of steam will be

A. 260 kW
B. 282 kW
C. 296 kW
D. 302 kW

Answer: Option B

Explanation:

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4. 

In an impulse turbine, steam expands

A. wholly in blades
B. wholly in nozzle
C. partly in the nozzle and partly in blades
D. none of these

Answer: Option B

Explanation:

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5. 

In a nozzle, the effect of supersaturation is to increase the dryness fraction of steam.

A. Yes
B. No

Answer: Option A

Explanation:

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