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

None of these
Is less liable to spontaneous combustion on storage
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
Producer gas containing least amount of tar is produced by the

Atmospheric pressure gasification of coal (e.g., in Kopper-Totzek gasifier)
High pressure gasification of coal (e.g. in Lurgi gasifier)
Partial combustion of large size (< 50 mm) coke
Partial combustion of coal

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