Fuels and Combustion
Bomb calorimeter is used to determine the (where, GCV - Gross Calorific Value. NCV - Net Calorific Value.)

GCV at constant pressure
NCV at constant volume
GCV at constant volume
NCV at constant pressure

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Fuels and Combustion
Fixed carbon in coal is defined as

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

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