Compressors, Gas Turbines and Jet Engines
Rotary compressors are used for delivering

Large quantities of air at high pressures
Small quantities of air at high pressures
Large quantities of air at low pressures
Small quantities of air at low pressures

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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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