Fuels and Combustion
Presence of free moisture in coal is most disadvantageous during

None of these
Its pulverisation (as it requires more power)
Combustion of fire slacks on the grates
Handling (e.g. when emptying wagons)

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Fuels and Combustion
The main drawback of supplying more excess air in the combustion of fuel is the

Excessive power requirement of air blower
Enhanced sensible heat loss in the flue gas
Intermittant and uncontrolled combustion of the fuel
High exit flue gas temperature from the furnace

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