Compressors, Gas Turbines and Jet Engines
The overall isothermal efficiency of compressor is defined as the ratio of

Isothermal h.p. to the BHP of motor
Power to drive compressor to isothermal h.p.
Isothermal h.p. to adiabatic h.p.
Work to compress air isothermally to work for actual compression

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

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

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