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Fuels and Combustion

Fuels and Combustion
Coking time in narrow by-product coke ovens is around __________ hours.

8
80
48
18

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Fuels and Combustion
A gaseous fuel in order to develop luminousity on burning, must contain

Hydrogen
Carbon monoxide
Hydrocarbons
Oxygen

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Fuels and Combustion
Undercharging of coal in the by-product coke ovens results in

No change in the c.v. of coke oven gas
Increase in its throughput
Decrease in the c.v. of coke oven gas
Increase in the c.v. of coke oven gas

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Fuels and Combustion
A particular coal is said to be free burning when it

None of these
Burns completely
Gives smokeless burning
Shows little or no fusing action

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Fuels and Combustion
C/H ratio is the maximum in case of

Naphtha
Coal
Furnace oil
Natural gas

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Fuels and Combustion
Presence of free moisture in coal is most disadvantageous during

Combustion of fire slacks on the grates
Its pulverisation (as it requires more power)
Handling (e.g. when emptying wagons)
None of these

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