Fuels and Combustion
Sulphur in metallurgical coal

Contributes to its heating value
Neither A nor B
Affects the quality of steel produced as cracks develop on the surface while rolling the steel
Both A and B

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Fuels and Combustion
Presence of free moisture in coal during its high temperature carbonisation

Reduces the coking time
None of these
Protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls
Increases the loss of fine coal dust from the ovens when charging

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