Fuels and Combustion
Short/intense flame is produced during combustion of gaseous fuel by using

Very little excess air
Low amount/current of combustion air
Preheated secondary air
High amount/current of combustion air

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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
Suppresses the discharge of fine dust and grit into atmosphere
All of these

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Fuels and Combustion
Fixed carbon in coal is defined as

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

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