Compressors, Gas Turbines and Jet Engines
In air compressors, free air delivery means the

None of the listed here
Actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions
Volume of air sucked by the compressor during its suction stroke
Volume of air delivered by the compressor

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Compressors, Gas Turbines and Jet Engines
Producer gas is produced by

Carbonisation of coal
Passing air and a large amount of steam over waste coal at about 65°C
Partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast
Passing steam over incandescent coke

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