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
In a jet propulsion

None of these
Its functioning does not depend upon presence of air
The propulsive matter is ejected from within the propelled body
The propulsive matter is caused to flow around the propelled body

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