Fuels and Combustion
Degree of carbonisation of coal during coke making can be roughly judged by the __________ of the coke produced.

Moisture content
Ash content
Volatile matter
Colour

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Fuels and Combustion
A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon

Is less liable to spontaneous combustion on storage
None of these
Requires smaller combustion space and less secondary air
Is more difficult to ignite and produces a shorter flame

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