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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Fuels and Combustion
Beehive coke oven

Produces coke with very poor strength
Facilitates by-products recovery
Gives larger yield of coke (around 85%) as compared to by-product ovens
Takes 2-3 days for coking of coal but requires no external fuel for heating

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