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't be pulverised
Coal can be easily pulverised
Coal can be pulverised with great difficulty

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Fuels and Combustion
Combustion of pulverised fuel

In a metallurgical furnace does not contaminate the product in the furnace by ash from fuel
Requires larger combustion chamber than rich gaseous fuel
All of these
Suppresses the discharge of fine dust and grit into atmosphere

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