Compressors, Gas Turbines and Jet Engines
Which one of the following is the effect of blade shape on performance of a centrifugal compressor?

Forward curved blades has higher efficiency
Forward curved blades produce lower pressure ratio
Backward curved blades has poor efficiency
Backward curved blades lead to stable performance

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

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

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

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