Fuels and Combustion
Gray King Assay and Swelling Index of a coal is a measure of its

Resistance to impact breakage
Agglutinating properties
Swelling characteristics
Abradability

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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
Protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls
None of these

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