Compressors, Gas Turbines and Jet Engines
In a double acting compressor, the air is compressed

In two cylinders on both sides of the piston
In one cylinder
In a single cylinder on both sides of the piston
In two cylinders

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

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