Compressors, Gas Turbines and Jet Engines
The advantage of multistage compression over single stage compression is

All of these
Decreased discharge temperature
Lower power consumption per unit of air delivered
Higher volumetric efficiency

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Compressors, Gas Turbines and Jet Engines
For a two stage reciprocating compressor, compression from p₁ to p₃ is with perfect intercooling and no pressure losses. If compression in both the cylinders follows the same polytropic process and the atmospheric pressure is pa, then the intermediate pressure p₂ is given by

p₂ = p₁. p₃
p₂ = (p₁ + p₃)/2
p₂ = Pa p₃/p₁
P₂ = Pa × p₃/p₁

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Compressors, Gas Turbines and Jet Engines
Choose the correct statement

Gas turbines have high standby losses and require lot of maintenance
Gas turbine is capable of rapid start up and loading
Gas turbine requires lot of cooling water
Gas turbines has flat efficiency at part loads

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

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