Fuels and Combustion
By-products recovery process from coal carbonisation is termed as direct, indirect and semi direct process depending upon the method of recovery of

Ammonia
Tar
None of these
Benzol

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Fuels and Combustion
Lignite is

A black banded coal which burns with a non-smoky yellowish flame
A coking coal
Can be used for gasification and steam generation
A high rank coal

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

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

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