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

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Compressors, Gas Turbines and Jet Engines
Which of the following statement is correct as regard to centrifugal compressors?

The impeller rotates at high speeds
The flow of air is parallel to the axis of the compressor
The maximum efficiency is higher than multistage axial flow compressors
The static pressure of air in the impeller increases in order to provide centripetal force on the air

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