Compressors, Gas Turbines and Jet Engines
The inter-cooler pressure, for minimum work required, for a two stage reciprocating air compressor, is given by (where p₁ = Intake pressure of air, p₂ = Inter-cooler pressure, and p₃ = Delivery pressure of air)

p₂ = p₃/p₁
p₂ = p₁/p₃
p₂ = p₁ × p₂
p₂ = p₁ × p₃

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Compressors, Gas Turbines and Jet Engines
The specific output per kg mass flow rate of a gas turbine (having fixed efficiencies of compressor and turbine and fixed higher and lower temperature) with increase in pressure ratio will

First increase, reach maximum and then decrease
Increase first at fast rate and then slow
Increase first at slow rate and then fast
Decrease continuously

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