Compressors, Gas Turbines and Jet Engines
An ideal air compressor cycle with clearance on P-V diagram can be represented by following processes

One adiabatic, two isobaric, and one constant volume
One adiabatic, one isobaric and two constant volumes
Two adiabatic, one isobaric and one constant volume
Two adiabatic and two isobaric

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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?

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

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