Steam Boilers - Interview Questions | Exam2Win

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86. Overtire burning is the phenomenon of

A. supply of excess, air

B. supply of excess coal

C. burning CO and unburnt in upper zone of furnace by supplying more air

D. fuel bed firing

E. none of the above.

Explanation:

87. Feed water conditioning in thermal power plants in done to

A. reduce hardness and for removal of solids

B. increase efficiency-of thermal power plant

C. increase heat transfer rate

D. increase steam parameters

E. all of the above.

Explanation:

88. Natural water circulation, by convection in water tube boilers, with increase in pressure of boiler

A. increases

B. decreases

C. remains unaffected

D. first increases and then decreases

E. first decreases and then increases.

Explanation:

89. Which is not the correct statement about moisture in coal

A. inherent moisture and surface moisture are different things

B. in some coals moisture may be present upto 40%

C. some moisture in coal helps in better burning which is not possible with completely dry coal

D. it increases thermal efficiency

E. moisture in coal is removed before firing by heating it with hot air.

Explanation:

90. The specific volume of steam with increase in pressure decreases

A. linearly

B. slowly first and then rapidly

C. rapidly first and then slowly

D. inversely

E. none of the above.

Explanation: