Fuels and Combustion
Coke oven gas is a better fuel than blast furnace gas, because of its higher

Calorific value, cleanliness and relatively low distribution cost (due to its low specific gravity)
Adiabatic flame temperature
Heat release rate (thus requiring smaller combustion chamber)
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

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

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