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Fuels and Combustion

Fuels and Combustion
Coal is heated in presence of air to a temperature of about __________ °C, while determining its ash content for proximate analysis.

1100
750
950
500

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Fuels and Combustion
Presence of nitrogen in combustion air does not reduce the

Flue gas temperature
Any of the above
Flame temperature
Amount of heat liberated

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Fuels and Combustion
In low temperature carbonisation of coal as compared to high temperature carbonisation __________ produced is less.

Yield percentage of coke
Yield of ammonia present in coke oven gas
Difference in gross & net calorific value of the coke oven gas
Free carbon content in tar

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Fuels and Combustion
A coal with high ash content

Is not subjected to washing
Is harder and stronger
Has low quantity of mineral matter
Has higher calorific value

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Fuels and Combustion
The maximum adiabatic flame temperature in air as compared to that in pure oxygen is

Either lower or higher, depends on the type of fuel
Same
Much lower
Much higher

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Fuels and Combustion
Caking coal is desirable for

All of these
Burning on firebars
Burning on travelling grate
Coke making

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