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Fuels and Combustion

Fuels and Combustion
Fuel combustion is never cent per cent efficient due to

Moisture loss
All of these
Incomplete combustion
Dry gas/stack gas loss

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

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

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Fuels and Combustion
The heat of combustion of a fuel

Can't be known without calculating it
Is always negative
Is always positive
Is equal to the heat of formation

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Fuels and Combustion
Coke having higher porosity has

Lower strength
All of these
Higher reactivity
Lower bulk density

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Fuels and Combustion
Coking time in narrow by-product coke ovens is around __________ hours.

80
8
48
18

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Fuels and Combustion
Blast furnace gas compared to coke oven gas has

Narrower limit of inflammability
Higher calorific value
Lower theoretical flame temperature
Lower ignition temperature

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