Fuels and Combustion
A certain thickness of the coal, if stored unscientifically on soft (katcha) ground having no metallic/concrete flooring gets sunked into the ground, which is termed as the 'carpet loss'. The carpet loss may be of the order of __________ cms.

5 to 15
20 to 40
3 to 4
1 to 2

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Fuels and Combustion
Bright coal

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

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