Fuels and Combustion
Pick out the wrong statement.

Pulverised fuel can be completely burnt with less percentage of excess air compared to lump coal
Regulation of furnace temperature and atmosphere (oxidising or reducing) is easily possible with pulverised fuel firing
None of these
Low grade coal can be used, but generally high volatile matter coals are more suitable for making pulverised fuel

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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
Is less liable to spontaneous combustion on storage
None of these
Requires smaller combustion space and less secondary air

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