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

Passing air and a large amount of steam over waste coal at about 65°C
Carbonisation of coal
Passing steam over incandescent coke
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
The assumption made in two stage compression with inter-cooler is that

The suction and delivery of air takes place at constant pressure
All of the listed here
The compression in both the cylinders is polytropic
There is no pressure drop in the inter-cooler

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