Compressors, Gas Turbines and Jet Engines
Volumetric efficiency is

The ratio of stroke volume to clearance volume
Index of compressor performance
The ratio of the air actually delivered to the amount of piston displacement
Reciprocal of compression ratio

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Compressors, Gas Turbines and Jet Engines
For a two stage reciprocating compressor, compression from p₁ to p₃ is with perfect intercooling and no pressure losses. If compression in both the cylinders follows the same polytropic process and the atmospheric pressure is pa, then the intermediate pressure p₂ is given by

P₂ = Pa × p₃/p₁
p₂ = Pa p₃/p₁
p₂ = p₁. p₃
p₂ = (p₁ + p₃)/2

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Compressors, Gas Turbines and Jet Engines
Pick up the correct statement

Gas turbines use both air and liquid cooling
Gas turbine's blade will appear as impulse section at the hub and as a reaction section at tip
Gas turbines have their blades similar to steam turbine
Large gas turbines use radial inflow turbines

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