Fuels and Combustion
With increase in calorific value of fuels, their adiabatic flame temperatures

Remain unchanged
Decrease
May increase or decrease ; depends on the quantity of products of combustion
Increase

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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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