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Fuels and Combustion

Fuels and Combustion
Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around __________ percent.

20
40
4
96

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Fuels and Combustion
Function of secondary air in pulverised coal firing is to

Transport the coal to the burner
Ensure efficient burning of coal around the burner
Dry the coal
Reduce primary air requirement

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Fuels and Combustion
Gobar gas is produced by the __________ of cown dung.

Fermentation
Oxidation
None of these
Hydrogenation

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Fuels and Combustion
Presence of phosphorous in metallurgical coal

Reduces its calorific value
Increases its caking power
Badly affects the quality of steel
Is not undersirable

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Fuels and Combustion
Too much of excess air in combustion results in high

All of these
Fuel consumption for the same heat load
Stack gas temperature
Percentage of oxygen in flue gases

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Fuels and Combustion
A fuel containing carbon and carbon monoxide (but containing no hydrogen or its compounds) is burnt in pure oxygen at constant pressure. Its gross calorific value as compared to net calorific value will be

Same
Data insufficient; can't be predicted
More
Less

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