Fuels and Combustion
Gross and net calorific value of a fuel will be the same

If its ash content is zero
Ifits carbon content is very low
Under no circumstances
If its hydrogen/hydrogen compound content is zero

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Fuels and Combustion
With increase in the temperature of carbonisation of coal

Hydrogen content of coke oven gas increases due to cracking of hydrocarbons
Methane content in the coke oven gas decreases and carbon monoxide content increases
All of these
Calorific value of the coke oven gas decreases due to cracking of hydrocarbons which is not compensated by increase in CO & H? content

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