Fuels and Combustion
Out of the following fuels, the difference between the net and gross calorific value is maximum in case of

Fuel oil
Pitch
Blast furnace gas
Bituminous coal

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Fuels and Combustion
Fixed carbon in coal is defined as

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
The total quantity of carbon present in the coal

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