Fuels and Combustion
The fuel ratio of a coal is

Both A and B
Neither A nor B
The ratio of its percentage of fixed carbon to that of volatile matter
Helpful in estimation of its rank

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Fuels and Combustion
Bright coal

Contains mainly vitrain & clarain and is generally coking
Contains more than 90% durain
Contains more than 90% fussain
Is non-coking

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