Fuels and Combustion
If the specific heat of gaseous products of combustion of a fuel is high, the abiabatic flame temperature will be

None of these
Very high, if the fuel is of low calorific value
Low
High

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Fuels and Combustion
Producer gas containing least amount of tar is produced by the

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

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