Fuels and Combustion
Calorific value of

N-paraffin is lower than that of iso-paraffins of the same compounds
Light paraffinic fuel oils is equal to that of equivalent olefins
Light paraffinic fuel oils is higher than that of equivalent olefins
Light paraffinic fuel oils is lower than that of equivalent olefins

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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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