Chemical Engineering - Fuels and Combustion

36. 

Washing of coal

A. reduces its ash & sulphur content.
B. improves its coking properties.
C. increase the fusion point of its ash by removing chlorine compounds.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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37. 

Calorific value of of blast furnace gas is around __________ KCal/Nm3.

A. 850
B. 1800
C. 4200
D. 6500

Answer: Option A

Explanation:

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38. 

In low temperature carbonisation of coal as compared to high temperature carbonisation __________ produced is less.

A. difference in gross & net calorific value of the coke oven gas
B. free carbon content in tar
C. yield percentage of coke
D. yield of ammonia present in coke oven gas

Answer: Option A

Explanation:

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39. 

Coal tar (produced by high temperature carbonisation) is the main source of

A. aromatic compounds
B. alphatic compounds
C. paraffins
D. olefins

Answer: Option A

Explanation:

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40. 

The calorific value is the highest out of the following for

A. producer gas
B. water gas
C. coke oven gas
D. blast furnace gas

Answer: Option C

Explanation:

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