Mechanical Engineering - Steam Boilers and Engines

16. 

A device used to increase the temperature of saturated steam without raising its pressure, is called

A. blow off cock
B. fusible plug
C. superheater
D. stop valve

Answer: Option C

Explanation:

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17. 

The diameter of flue tube in a Cornish boiler is __________ that of the shell.

A. one-fourth
B. one-third
C. two-fifth
D. three-fifth

Answer: Option D

Explanation:

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18. 

An economiser __________ the steam raising capacity of a boiler.

A. increases
B. decreases
C. has no effect on

Answer: Option A

Explanation:

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19. 

Fire tube boilers are

A. internally fired
B. externally fired
C. internally as well as externally fired
D. none of these

Answer: Option A

Explanation:

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20. 

A safety valve usually employed with stationary boilers is

A. lever safety valve
B. dead weight safety valve
C. high steam and low water safety valve
D. all of these

Answer: Option D

Explanation:

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