Steam Boilers - Interview Questions | Exam2Win

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61. Calorific value of coal is of the order of

A. 200-400 kcal/kg

B. 800-1200 kcal/kg

C. 2000-4000 kcal/kg

D. 5000-8000 kcal/kg

E. 8000-10,000 kcal/kg.

Explanation:

62. Tertiary air is the air used to

A. provide air around burners for obtaining optimum combustion

B. transport and dry the coal

C. cool the scanners

D. supply air for seigniors

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

Explanation:

63. Green coal, in order to be burnt, must be

A. heated sufficiently

B. burnt in excess air

C. heated to its ignition point

D. burnt as powder

E. burnt as lumps.

Explanation:

64. Incomplete combustion can be best judged by

A. smoky chimney exit

B. excess air in flue gases

C. measuring carbon mono-oxide in flue gases

D. measuring temperature of flue gases at exit of furnace

E. measuring oxygen in flue gases.

Explanation:

65. Presence of moisture in fuel oil would

A. keep the burner tips cool

B. aid in proper combustion

C. cause sputtering, possibly extinguish�ing flame

D. clean the nozzles

E. reduce flame length.

Explanation: