Compressors, Gas Turbines and Jet Engines
A turboprop is preferred to turbojet because

It can fly at high elevations
It has high propulsive efficiency at high speeds
It has high power for take off
It can fly at supersonic speeds

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

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

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