Mechanical Engineering - Steam Boilers and Engines

31. 

A device used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit, is called

A. blow off cock
B. stop valve
C. superheater
D. none of these

Answer: Option D

Explanation:

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32. 

The device attached to the steam chest for preventing explosions due to excessive internal pressure of steam is called

A. safety valve
B. water level indicator
C. pressure gauge
D. fusible plug

Answer: Option A

Explanation:

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33. 

In a steam engine, superheated steam from the boiler is fed into the steam chest at a pressure of

A. 10 atmospheres
B. 20 atmospheres
C. 30 atmospheres
D. 40 atmospheres

Answer: Option B

Explanation:

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34. 

A device used to empty the boiler whenever required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler, is called blow off cock.

A. Yes
B. No

Answer: Option A

Explanation:

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35. 

Clearance ratio is the ratio of

A. clearance volume to the swept volume
B. clearance volume to the volume at cut-off
C. volume at cut-off to the swept volume
D. swept volume to the clearance volume

Answer: Option A

Explanation:

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