Chemical Engineering - Fuels and Combustion

16. 

In high temperature carbonisation (as compared to low temperature carbonisation) of coal

A. coke oven gas yield is more.
B. tar yield is less but free carbon in tar is more.
C. calorific value of coke oven gas is less.
D. all (a), (b), and (c).

Answer: Option D

Explanation:

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17. 

Anthracite coal

A. contains more volatile matter than bituminous coal.
B. ignites more easily than bituminous coal.
C. is essentially a coking coal.
D. burns with short, bluish, yellow-tipped flame producing very little smoke.

Answer: Option D

Explanation:

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18. 

Number of macrocomponents present in coal according to Stopes are

A. four
B. five
C. six
D. two

Answer: Option A

Explanation:

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19. 

The maximum adiabatic flame temperature in air as compared to that in pure oxygen is

A. much lower.
B. much higher.
C. same.
D. either lower or higher, depends on the type of fuel.

Answer: Option A

Explanation:

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20. 

Yield of charcoal in high temperature carbonisation of wood is about __________ percent.

A. 10
B. 25
C. 50
D. 75

Answer: Option B

Explanation:

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