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

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

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Fuels and Combustion
Calorific value of

Light paraffinic fuel oils is equal to that of equivalent olefins
N-paraffin is lower than that of iso-paraffins of the same compounds
Light paraffinic fuel oils is higher than that of equivalent olefins
Light paraffinic fuel oils is lower than that of equivalent olefins

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Fuels and Combustion
Fixed carbon in coal is defined as

The total quantity of carbon present in the coal
The one which is present in the residue after combustion
That present in volatile matters
Hundred minus the percentage of volatile matter, ash and moisture

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