Chemical Engineering - Fuels and Combustion

46. 

Naphthalene is used for making

A. insecticides (e.g. moth balls).
B. unsaturated polyesters.
C. drug intermediates e.g. β-naphthol.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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47. 

The advantage of firing pulverised coal in the furnace lies in the fact, that it

A. permits the use of high ash content coal.
B. permits the use of low fusion point ash coal.
C. accelerates the burning rate and economises on fuel combustion.
D. all (a), (b) and (c).

Answer: Option C

Explanation:

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48. 

A coal having higher volatile matter content, has lower

A. smoking tendency on burning.
B. coke oven gas yield on carbonisation.
C. chance of catching fire during storage in open space.
D. ignition temperature.

Answer: Option D

Explanation:

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49. 

Weathering of coal during storage causes

A. reduction in coal size.
B. increase in its friability.
C. decrease in its caking capacity.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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50. 

With increase in the temperature of carbonisation of coal

A. hydrogen content of coke oven gas increases due to cracking of hydrocarbons.
B. methane content in the coke oven gas decreases and carbon monoxide content increases.
C. calorific value of the coke oven gas decreases due to cracking of hydrocarbons which is not compensated by increase in CO & H2 content.
D. all (a), (b) and (c)

Answer: Option D

Explanation:

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