Fuels and Combustion
Preheating of coal charge for the coke ovens reduces the

All of these
Fuel consumption in coking
Yield of gas and tar
Time of carbonisation

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Fuels and Combustion
Sometimes water is sprayed during coal charging in the coke oven, which helps in

Reducing the cracking of hydrocarbons in the gas and increasing the percentage of CO & H₂ in the gas (due to the endothermic reaction represented by C + H₂O = CO + H₂)
All of these
Prevention of clinker formation in the oven
Controlling the dust nuisance while charging the coal

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