Fuels and Combustion
Mott and Wheeler test is conducted on coke to find its

Reactivity with O₂
Phosphorus content
Abradability
Volatile matter content

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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
That present in volatile matters
The one which is present in the residue after combustion

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