Fuels and Combustion
Safe condition for storage of high V.M. bituminous coal is that

Both A and B
Maximum 200 tons should be stored in a heap
Height of the coal heap should be < 3 metres
Neither A nor B

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Fuels and Combustion
Bright coal

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

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