Compressors, Gas Turbines and Jet Engines
If p₁ is the pressure of air entering the L.P, cylinder and p₃ is the pressure of air leaving the H.P. cylinder, then the ratio of cylinder diameters for a single acting, two stage reciprocating compressor with complete intercooling is given by

D₁/D₂ = (p₁ p₃)1/4
D₁/D₂ = (p₃/p₁)1/4
D₁/D₂ = (p₁ p₃)1/2
D₁/D₂ = (p₁/p₃)1/4

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Compressors, Gas Turbines and Jet Engines
Volumetric efficiency of a compressor with clearance volume

In not dependent upon compression ratio
Decreases with increase in compression ratio
May increase/decrease depending on compressor capacity
Increases with increase in compression ratio

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Compressors, Gas Turbines and Jet Engines
Choose the correct statement

Gas turbine requires lot of cooling water
Gas turbines have high standby losses and require lot of maintenance
Gas turbines has flat efficiency at part loads
Gas turbine is capable of rapid start up and loading

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