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

Volume of air delivered by the compressor
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
None of the listed here

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

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

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