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

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

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Fuels and Combustion
A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the

Low calorific value of the fuel
High sulphur content in the fuel
Presence of large quantity of hydrogen in the fuel
Lack of thorough mixing of fuel with air

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