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

Bituminous coal
Blast furnace gas
Pitch
Fuel oil

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Fuels and Combustion
Beehive coke oven

Facilitates by-products recovery
Produces coke with very poor strength
Takes 2-3 days for coking of coal but requires no external fuel for heating
Gives larger yield of coke (around 85%) as compared to by-product ovens

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