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

Moisture content
Colour
Volatile matter
Ash content

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

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