Fuels and Combustion
Natural draught produced by a chimney depends upon the

Density of the chimney gases
Height of the chimney
Both A & B
Neither A nor B

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

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

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