Chemical Engineering - Fuels and Combustion

6. 

The maximum adiabatic flame temperature is attained, when the fuel is burnt with

A. theoretically required amount of air.
B. more than theoretically required amount of air.
C. less than theoretically required amount of air.
D. theoretically required amount of oxygen.

Answer: Option D

Explanation:

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7. 

Grindability index of a coal is 100. It implies that the

A. coal can be pulverised with great difficulty.
B. coal can't be pulverised.
C. coal can be easily pulverised.
D. power consumption in grinding the coal will be very high.

Answer: Option C

Explanation:

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8. 

The cooling medium used in dry quenching of coke is

A. nitrogen
B. air
C. phenolic water
D. carbon dioxide

Answer: Option A

Explanation:

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9. 

A particular coal is said to be free burning when it

A. burns completely.
B. gives smokeless burning.
C. shows little or no fusing action.
D. none of these.

Answer: Option C

Explanation:

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10. 

Gobar gas is produced by the __________ of 'gobar' (cow dung).

A. hydrolysis
B. fermentation
C. oxidation
D. dehydration

Answer: Option B

Explanation:

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