Compressors, Gas Turbines and Jet Engines
Pick up the correct statement

Large gas turbines use radial inflow turbines
Gas turbines use both air and liquid cooling
Gas turbine's blade will appear as impulse section at the hub and as a reaction section at tip
Gas turbines have their blades similar to steam turbine

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Compressors, Gas Turbines and Jet Engines
The overall efficiency of the compressed air system is the

Ratio of shaft output of the air motor to the shaft input to the compressor
Product of shaft output of air motor and shaft input to the compressor
Ratio of shaft input to the compressor to the shaft output of air motor
None of these

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