Fuels and Combustion
C.V. (kcal/Nm³) of gaseous fuels __________ with increase in molecular weight.

Increases
Decreases
Remains constant
May increase or decrease, depends on combustibles

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

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