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

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

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Compressors, Gas Turbines and Jet Engines
If p₁, is the pressure of air entering the L.P. cylinder and p₂ is the pressure of air leaving the L.P. cylinder (or inter-cooler pressure), then the ratio of cylinder diameters for a single acting, two stage reciprocating air compressor with complete intercooling is given by (where D₁ = Dia. of L.P. cylinder, and D₂ = Dia. of H.P. cylinder)

D₁/D₂ = p₂/p₁
None of these
D₁/D₂ = p₁ p₂
D₁/D₂ = p₁/p₂

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Compressors, Gas Turbines and Jet Engines
In a jet propulsion

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

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