Compressors, Gas Turbines and Jet Engines
Which is false statement about multistage compression?

The moisture in air is condensed in the inter-cooler
Power consumption per unit of air delivered is low
It is best suited for compression ratios around 7:1
Volumetric efficiency is high

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Compressors, Gas Turbines and Jet Engines
In a jet propulsion

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

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

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