Compressors, Gas Turbines and Jet Engines
The volumetric efficiency of a compressor

Increases with decrease in compression ratio
Decreases with decrease in compression ratio
Decreases with increase in compression ratio
Increases with increase in compression ratio

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Compressors, Gas Turbines and Jet Engines
The following is true for an open cycle gas turbine having exhaust heat exchanger. Atmospheric air before entering the compressor is

Exhaust gases drive the compressor
Bled gas from turbine is heated and readmitted for complete expansion
Compressed air before entering the combustion chamber is heated
Heated

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

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