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
Backward curved blades lead to stable performance
Forward curved blades produce lower pressure ratio

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

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

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