Compressors, Gas Turbines and Jet Engines
For a two stage reciprocating compressor, compression from p₁ to p₃ is with perfect intercooling and no pressure losses. If compression in both the cylinders follows the same polytropic process and the atmospheric pressure is pa, then the intermediate pressure p₂ is given by

p₂ = (p₁ + p₃)/2
p₂ = Pa p₃/p₁
P₂ = Pa × p₃/p₁
p₂ = p₁. p₃

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Compressors, Gas Turbines and Jet Engines
In a jet propulsion

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

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

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

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