Fuels and Combustion
A particular coal is said to be free burning when it

Gives smokeless burning
None of these
Shows little or no fusing action
Burns completely

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Fuels and Combustion
Fixed carbon in coal is defined as

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

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