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

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

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Fuels and Combustion
Prime coking coal is always blended with medium or non- coking coal before ear-bonisation

Because, it alone produces unreactive coke
Neither A nor B
Both A & B
To check against its excessive swelling during heating, which may exert high pressure and damage coke oven walls

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

Prevention of clinker formation in the oven
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
Controlling the dust nuisance while charging the coal

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