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Fuels and Combustion

Fuels and Combustion
Coal containing large quantity of __________ are difficult to wash.

Volatile matter
Ash
Free impurities
Inherent mineral matter

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Fuels and Combustion
Overfire burning in a furnace is a phenomenon characterised by the

Supply of excess air
None of these
Supply of excess fuel
Burning of carbon monoxide and other incombustibles in upper zone of furnace by supplying more air

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Fuels and Combustion
With increase in C/H ratio of a fuel, the dew point of flue gases

Remains same
Decreases
Increases
May increase or decrease ; depends on the type of fuel

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Fuels and Combustion
Theoretical flame temperature of a fuel is that temperature which is attained, when the fuel is completely burnt 'using theoretical amount of air in

Either A or C without gain or loss of heat
Oxygen
Air
Either A or B

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Fuels and Combustion
While the first commercial low temperature coal carbonisation plant is located at Neyveli (in Chennai), the second such plant has been built at

Raniganj
Singreni (AP.)
Dankuni (West Bengal)
Dhanbad

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Fuels and Combustion
With increases in carbonisation temperature

Hydrogen percentage in the coke oven gas decreases
Coke even gas yield increases
Tar yield increases
Methane percentage in the coke oven gas increases

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