Steam Boilers - Interview Questions | Exam2Win

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66. The three "Ts" for good combustion are

A. temperature, time, and turbulence

B. total air, true fuel, and turbulence

C. thorough mixing, total air, and temperature

D. total air, time, and temperature

E. none of the above.

Explanation:

67. Which is not correct statement about pulverized fuel firing

A. high burning rate is possible

B. heat release can be easily controlled

C. fuel burns economically

D. it is the best technique for burning high ash content fuel having low fusion ash

E. separate mills are required to powder the coal.

Explanation:

68. Carbonisation of coal is the process of

A. pulverising coal in inert atmosphere

B. heating wood in a limited supply of air at temperatures below 300�C

C. strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel

D. binding the pulverised coal into brickettes

E. enriching carbon in the coal.

Explanation:

69. Pick up wrong statement about desired properties of a good fuel

A. high calorific value

B. produce minimum smoke and gases

C. ease in storing

D. high ignition point

E. economical

Explanation:

70. Gradually increasing temperature of flue gases at inlet to chimney for given steam outputs is an indication of

A. higher effectiveness of boiler

B. high calorific value coal being burnt

C. fouling of heat transfer surfaces

D. raising of steam temperature

E. leakage of air.

Explanation: