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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Compressors, Gas Turbines and Jet Engines
Intercooling in gas turbines

Decreases net output and thermal efficiency both
Increases net output and thermal efficiency both
Decreases net output but increases thermal efficiency
Increases net output but decreases thermal efficiency

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