Fuels and Combustion
Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has

Neither A nor B
Lower hydrogen content
Higher calorific value
Both A & B

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

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Fuels and Combustion
The weathering index of a coal

Is related to its calorific value
Is a measure of its size stability, when stored & exposed to weather
Gives an idea of the fusion temperature of ash
Is a measure of its caking tendency

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