Mechanical Engineering - Steam Boilers and Engines

31. 

The fire tubes in a Scotch marine boiler are

A. horizontal
B. vertical
C. inclined

Answer: Option A

Explanation:

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32. 

In a reciprocating steam engine, the heat energy in the steam is converted into mechanical work by the to and fro motion of the piston.

A. Agree
B. Disagree

Answer: Option A

Explanation:

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33. 

The power of a boiler may be defined as

A. the ratio of heat actually used in producing the steam to the heat liberated in the furnace
B. the amount of water evaporated or steam produced in kg per kg of fuel burnt
C. the amount of water evaporated from and at 100° C into dry and saturated steam
D. the evaporation of 15.653 kg of water per hour from and at 100° C

Answer: Option B

Explanation:

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34. 

When the circulation of water, in a boiler, is by a centrifugal pump, then the boiler is known as

A. internally fired boiler
B. externally fired boiler
C. natural circulation boiler
D. forced circulation boiler

Answer: Option D

Explanation:

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35. 

The function of a safety valve is

A. to blow off steam when the pressure of steam inside the boiler exceeds the working pressure
B. to indicate the water level inside the boiler to an observer
C. to measure pressure of steam inside the steam boiler
D. none of the above

Answer: Option A

Explanation:

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