Fuels and Combustion
For maximum discharge through a chimney, its height should be

More than 105.7 metres
Equal to the height of the hot gas column producing draught
Infinitely long
200 meters

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Fuels and Combustion
Fixed carbon in coal is defined as

Hundred minus the percentage of volatile matter, ash and moisture
The total quantity of carbon present in the coal
The one which is present in the residue after combustion
That present in volatile matters

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