Compressors, Gas Turbines and Jet Engines
Pick up the wrong statement about advantages of multistage compression

Better lubrication is possible advantages of multistage
Mechanical balance is better
Air can be cooled perfectly in between
More loss of air due to leakage past the cylinder

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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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