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

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

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Compressors, Gas Turbines and Jet Engines
For minimum work in multistage compression, assuming same index of compression in all stages

Work done in subsequent stages should decrease
Work done in subsequent stages should increase
Work done in all stages should be equal
Work done in first stage should be more

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Compressors, Gas Turbines and Jet Engines
In a turbo jet engine, subsequent to heat addition to compressed air, to get the power output, the working substance is expanded in

Turbine blades, which is a constant volume process
Exit nozzle, which is a constant volume process
Exit nozzle, which is essentially an isentropic process
Turbine blades, which is essentially an isentropic process

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Compressors, Gas Turbines and Jet Engines
An ideal air compressor cycle without clearance on P-V diagram can be represented by following processes

One adiabatic, two isobaric, and one constant volume
Two adiabatic, one isobaric and one constant volume
One adiabatic, one isobaric and two constant volumes
Two adiabatic and two isobaric

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Compressors, Gas Turbines and Jet Engines
Inter-cooling in gas turbine results in

Increase in thermal efficiency but decrease in net output
Increase in net output but decrease in thermal efficiency
Decrease in both thermal efficiency and net output
Increase in both thermal efficiency and net output

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