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

Abradability
Swelling characteristics
Agglutinating properties
Resistance to impact breakage

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Fuels and Combustion
A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon

None of these
Is less liable to spontaneous combustion on storage
Is more difficult to ignite and produces a shorter flame
Requires smaller combustion space and less secondary air

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