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Fuels and Combustion

Fuels and Combustion
The maximum percentage of CO₂ in a flue gas (from a carbonaceous fuel) can be

77
79
21
29

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Fuels and Combustion
Fusion point of coal ash increases with increase in its __________ content.

All of these
Iron silicate
Lime and magnesia
Iron sulphate

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

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

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Fuels and Combustion
White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is

Pulverised coke
Coke oven gas
Tar
Pitch

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

Oxygen
Hydrocarbons
Hydrogen
Carbon monoxide

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Fuels and Combustion
Which of the following petrographic constituents of coal is non-coking?

Fussain
Vitrain
Clarain
Durain

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