Fuels and Combustion
Grindability index of a coal is 100. It implies that the

Power consumption in grinding the coal will be very high
Coal can be easily pulverised
Coal can be pulverised with great difficulty
Coal can't be pulverised

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

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

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