Mechanical Engineering - Steam Boilers and Engines

21. 

The principal function of a stop valve is to

A. control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required
B. empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler
C. put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit
D. increase the temperature of saturated steam without raising its pressure

Answer: Option A

Explanation:

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22. 

The length of Cornish boiler varies from

A. 2 to 4.5 m
B. 3 to 5 m
C. 5 to 7.5 m
D. 7 to 9 m

Answer: Option C

Explanation:

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23. 

The indicated thermal efficiency is defined as the

A. ratio of thermal efficiency to the Rankine efficiency
B. ratio of brake power to the indicated power
C. ratio of heat equivalent to indicated power to the energy supplied in steam
D. product of thermal efficiency and Rankine efficiency

Answer: Option C

Explanation:

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24. 

In surface condensers, the condensate and the cooling water mixes up.

A. True
B. False

Answer: Option B

Explanation:

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25. 

A water level indicator is a device to indicate the exact water level in the boiler at any instant.

A. True
B. False

Answer: Option A

Explanation:

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