Fuels and Combustion
Gray-King Assay and Roga Index of coal is a measure of its

Abradability
Weathering properties
Caking and swelling properties
Grindability

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Fuels and Combustion
Fixed carbon in coal is defined as

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
The total quantity of carbon present in the coal

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Fuels and Combustion
Combustion of pulverised fuel

All of these
Suppresses the discharge of fine dust and grit into atmosphere
Requires larger combustion chamber than rich gaseous fuel
In a metallurgical furnace does not contaminate the product in the furnace by ash from fuel

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