Compressors, Gas Turbines and Jet Engines
If p₁ is the pressure of air entering the L.P, cylinder and p₃ is the pressure of air leaving the H.P. cylinder, then the ratio of cylinder diameters for a single acting, two stage reciprocating compressor with complete intercooling is given by

D₁/D₂ = (p₁ p₃)1/2
D₁/D₂ = (p₁/p₃)1/4
D₁/D₂ = (p₁ p₃)1/4
D₁/D₂ = (p₃/p₁)1/4

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Compressors, Gas Turbines and Jet Engines
The mean effective pressure of the compressor is the

Volume of air delivered by the compressor
Volume of air sucked by the compressor during its suction stroke
None of these
Actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions

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