Fuels and Combustion
Insitu theory and drift theory are related to the

Variation of coal quality with depth
Origin of petroleum oil
Origin of coal
Coalification

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

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

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