Chemical Engineering - Fuels and Combustion

41. 

In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of

A. transportation of coal.
B. drying of coal.
C. combustion of coal by supplying it around the burner.
D. preheating the primary air.

Answer: Option C

Explanation:

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42. 

Largest constituent of coke oven gas is

A. N2
B. H2
C. CH4
D. CO2

Answer: Option B

Explanation:

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43. 

Fussain

A. is friable, charcoal like substance.
B. has highest fixed carbon and lowest volatile matter content of all the four banded components of coal.
C. is non-coking, but when blended with highly coking coal, controls its swelling and produces high strength coke on carbonisation.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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44. 

Producer gas comprises mainly of

A. CO & N2
B. CO & H2
C. CO2 & N2
D. CO2 & H2

Answer: Option A

Explanation:

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45. 

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

A. gas yield is less.
B. tar yield is more.
C. ignition temperature of coke produced is less.
D. aromatic content of tar produced is more.

Answer: Option D

Explanation:

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