Chemical Engineering - Fuels and Combustion

11. 

Quantity of coke oven gas produced by high temperature carbonisation of one ton of dry coal may be around __________ Nm3 .

A. 30
B. 300
C. 3000
D. 30, 000

Answer: Option B

Explanation:

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12. 

Coking coals are invariably

A. lignites
B. bituminous coals
C. semi-anthracites
D. anthracites

Answer: Option B

Explanation:

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13. 

Which of the following accounts for maximum energy loss in a boiler ?

A. Flue gases.
B. Ash content in the fuel.
C. Incomplete combustion.
D. Unburnt carbon in flue gases.

Answer: Option A

Explanation:

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14. 

'Fuel' can be defined as a substance which produces heat by

A. combustion.
B. nuclear fission.
C. nuclear fusion.
D. all (a), (b) & (c).

Answer: Option D

Explanation:

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15. 

Washing of coal

A. reduces its sulphur and ash content.
B. controls its ash fusibility and increases its calorific value.
C. improves its coking properties.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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