Compressors, Gas Turbines and Jet Engines
For minimum work in multistage compression, assuming same index of compression in all stages

Work done in subsequent stages should decrease
Work done in subsequent stages should increase
Work done in first stage should be more
Work done in all stages should be equal

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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)

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

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Compressors, Gas Turbines and Jet Engines
The overall isothermal efficiency of compressor is defined as the ratio of

Isothermal h.p. to adiabatic h.p.
Isothermal h.p. to the BHP of motor
Work to compress air isothermally to work for actual compression
Power to drive compressor to isothermal h.p.

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