Compressors, Gas Turbines and Jet Engines
Free air is the air at

20°C and 1 kg/cm² and relative humidity of 36%
Atmospheric conditions at any specific location
15°C and 1 kg/cm²
0°C and standard atmospheric conditions

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Compressors, Gas Turbines and Jet Engines
Which of the following statement is correct as regard to centrifugal compressors?

The flow of air is parallel to the axis of the compressor
The impeller rotates at high speeds
The static pressure of air in the impeller increases in order to provide centripetal force on the air
The maximum efficiency is higher than multistage axial flow compressors

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