Compressors, Gas Turbines and Jet Engines
In a jet propulsion

None of these
The propulsive matter is caused to flow around the propelled body
Its functioning does not depend upon presence of air
The propulsive matter is ejected from within the propelled body

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

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
Passing steam over incandescent coke
Carbonisation of coal

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