Fuels and Combustion
Spontaneous combustion of coal on storage results due to

Inadequate ventilation
Storage in large heaps with small surface to volume ratio
Low temperature oxidation
All of these

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Fuels and Combustion
Prime coking coal is always blended with medium or non- coking coal before ear-bonisation

Because, it alone produces unreactive coke
Both A & B
Neither A nor B
To check against its excessive swelling during heating, which may exert high pressure and damage coke oven walls

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