Compressors, Gas Turbines and Jet Engines
In a compressor, free air delivered is the actual volume delivered at the stated pressure reduced to

20°C and 1 kg/cm²
Intake temperature and pressure conditions
N.T.P. conditions
0°C and 1 kg/cm²

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Compressors, Gas Turbines and Jet Engines
In a turbo jet engine, subsequent to heat addition to compressed air, to get the power output, the working substance is expanded in

Turbine blades, which is essentially an isentropic process
Turbine blades, which is a constant volume process
Exit nozzle, which is essentially an isentropic process
Exit nozzle, which is a constant volume process

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