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

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

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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
Backward curved blades has poor efficiency
Forward curved blades produce lower pressure ratio

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Compressors, Gas Turbines and Jet Engines
The mean effective pressure of the compressor is the

Volume of air sucked by the compressor during its suction stroke
Volume of air delivered by the compressor
None of these
Actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions

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