Fuels and Combustion
Out of the following fuels, the difference between gross and net calorific value will be minimum in case of

Coke oven gas
Natural gas
Water gas
Blast furnace gas

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Fuels and Combustion
Low temperature carbonisation

Produces less quantity of tar than high temperature carbonisation
Produces higher quantity of gas than high temperature carbonisation
Is meant for the production of 'metallurgical coke'
Is mainly for producing the smokeless domestic coke

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