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

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Compressors, Gas Turbines and Jet Engines
The overall isothermal efficiency of compressor is defined as the ratio of

Power to drive compressor to isothermal h.p.
Isothermal h.p. to the BHP of motor
Work to compress air isothermally to work for actual compression
Isothermal h.p. to adiabatic h.p.

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