Compressors, Gas Turbines and Jet Engines
The specific output per kg mass flow rate of a gas turbine (having fixed efficiencies of compressor and turbine and fixed higher and lower temperature) with increase in pressure ratio will

Increase first at fast rate and then slow
First increase, reach maximum and then decrease
Increase first at slow rate and then fast
Decrease continuously

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

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

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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 turbines have their blades similar to steam turbine
Gas turbine's blade will appear as impulse section at the hub and as a reaction section at tip

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