Fuels and Combustion
With increase in calorific value of fuels, their adiabatic flame temperatures

Decrease
Remain unchanged
Increase
May increase or decrease ; depends on the quantity of products of combustion

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Fuels and Combustion
Fixed carbon in coal is defined as

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

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