Chemical Engineering - Fuels and Combustion

46. 

When incomplete combustion loss is high, the flue gas analysis shows large amount of

A. CO2
B. CO
C. O2
D. C

Answer: Option B

Explanation:

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47. 

The gas which contributes maximum to the heating value of natural gas is

A. CO
B. CO2
C. H2
D. CH4

Answer: Option D

Explanation:

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48. 

The temperature at which plastic layer formation takes place during carbonisation of coal varies from __________ °C.

A. 100 to 150
B. 350 to 450
C. 550 to 650
D. 700 to 850

Answer: Option B

Explanation:

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49. 

Yield of coke oven gas in low temperature carbonisation of coal is about __________ Nm3 /ton of dry coal.

A. 60
B. 160
C. 500
D. 750

Answer: Option B

Explanation:

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50. 

Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the

A. requirement of large volume combustion chamber.
B. risk of explosion.
C. chances of clinker formation.
D. incomplete combustion of coal.

Answer: Option B

Explanation:

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