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.

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

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Fuels and Combustion
Rate of low temperature oxidation of coal due to bad storage conditions

Is more for low volatile coal compared to high volatile coal
Decreases with increase in surface area
Is accelerated by storage in large heaps with small surface to volume ratio
Does not vary with increase in surface area

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Fuels and Combustion
Ratio of primary air to secondary air increases with increase in the rank of coal, because the

Ratio of fixed carbon to volatile matter increases
Calorific value of the coal increases
High rank coals have higher amount of volatile matter
Oxygen content progressively decreases

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