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

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Compressors, Gas Turbines and Jet Engines
Choose the correct statement

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

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Compressors, Gas Turbines and Jet Engines
The assumption made in two stage compression with inter-cooler is that

The suction and delivery of air takes place at constant pressure
All of the listed here
There is no pressure drop in the inter-cooler
The compression in both the cylinders is polytropic

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