Compressors, Gas Turbines and Jet Engines
In n₁ and n₂ are the indices of compression for the first and second stage of compression, then the ratio of work-done on the first and second stages (W₁/W₂) with perfect intercooling is given by

W₁/W₂ = n₂(n₁ - 1)/n₁(n₂ - 1)
W₁/W₂ = n₂/n₁
W₁/W₂ = n₁(n₂ - 1)/n₂(n₁ - 1)
W₁/W₂ = n₁/n₂

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

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Compressors, Gas Turbines and Jet Engines
Intercooling in gas turbines

Decreases net output but increases thermal efficiency
Increases net output and thermal efficiency both
Increases net output but decreases thermal efficiency
Decreases net output and thermal efficiency both

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