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

Backward curved blades has poor efficiency
Forward curved blades has higher efficiency
Forward curved blades produce lower pressure ratio
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
Gauge discharge pressure to the gauge intake pressure
Stroke volume and clearance volume
Pressures at discharge and suction corresponding to same temperature

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