Fuels and Combustion
Turndown ratio of a gas burner is equal to the

Maximum to minimum heat input ratio
Both A & B
Minimum to maximum heat input ratio
Maximum to minimum permissible gas flow rate

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

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