Steam Boilers - Interview Questions | Exam2Win

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51. The temperature of flue gases at air heater outlet should be

A. 100�C

B. above dew-point temperature of flue gases

C. below dew-point temperature of flue gases

D. less than wet bulb temperature of flue gases

E. above wet bulb temperature of flue gases.

Explanation:

52. The safety valve on boiler drum compared to safety valve on superheated is set ai

A. same value

B. higher value

C. lower value

D. lower/higher depending on steam flow

E. unpredictable.

Explanation:

53. The ultimate analysis of fuel lists

A. various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as per-cents by volume

B. various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as per-cents by weight

C. fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash

D. fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash

E. moisture and ash free heating value.

Explanation:

54. Secondary air is the used to

A. provide air around burners for obtaining optimum combustion

B. transport and dry the coal

C. convert CO (formed in lower zone of furnace) into C02 at higher zone

D. air delivered by induced draft fan

E. air fed to pulverizes.

Explanation:

55. Which is not correct statement about the function of furnace

A. to provide proper conditions for continuous complete combustion

B. mix fuel with air and ignite

C. separate ash from coal

D. maintain heat supply to prepare and ignite the incoming fuel

E. to minimize radiation losses.

Explanation: