Compressors, Gas Turbines and Jet Engines
The inter-cooler pressure, for minimum work required, for a two stage reciprocating air compressor, is given by (where p₁ = Intake pressure of air, p₂ = Inter-cooler pressure, and p₃ = Delivery pressure of air)

p₂ = p₁/p₃
p₂ = p₃/p₁
p₂ = p₁ × p₃
p₂ = p₁ × p₂

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

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