Fuels and Combustion
Coal tar fuels (CTF) as compared to petroleum based fuel oils have higher

Difference in gross & net calorific value
Higher C/H ratio
Sulphur content
Calorific value

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

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

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