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

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

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

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

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Compressors, Gas Turbines and Jet Engines
An ideal air compressor cycle without clearance on P-V diagram can be represented by following processes

One adiabatic, one isobaric and two constant volumes
Two adiabatic, one isobaric and one constant volume
Two adiabatic and two isobaric
One adiabatic, two isobaric, and one constant volume

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