Compressors, Gas Turbines and Jet Engines
Phenomenon of choking in compressor means

Reducing mass flow rate with increase in pressure ratio
No flow of air
Increased inclination of chord with air steam
Fixed mass flow rate regardless of pressure ratio

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Compressors, Gas Turbines and Jet Engines
The overall isothermal efficiency of compressor is defined as the ratio of

Power to drive compressor to isothermal h.p.
Isothermal h.p. to the BHP of motor
Work to compress air isothermally to work for actual compression
Isothermal h.p. to adiabatic h.p.

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Compressors, Gas Turbines and Jet Engines
Ratio of compression is the ratio of

Absolute discharge pressure to the absolute intake pressure
Pressures at discharge and suction corresponding to same temperature
Stroke volume and clearance volume
Gauge discharge pressure to the gauge intake pressure

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