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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Fuels and Combustion
The main drawback of supplying more excess air in the combustion of fuel is the

Excessive power requirement of air blower
High exit flue gas temperature from the furnace
Intermittant and uncontrolled combustion of the fuel
Enhanced sensible heat loss in the flue gas

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