Compressors, Gas Turbines and Jet Engines
In air compressors, free air delivery means the

None of the listed here
Volume of air delivered by the compressor
Actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions
Volume of air sucked by the compressor during its suction stroke

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Compressors, Gas Turbines and Jet Engines
In the axial flow gas turbine, the work ratio is the ratio of

Actual total head temperature drop to the isentropic total head drop from total head inlet to static head outlet
Compressor work and turbine work
Output and input
Actual compressor work and theoretical compressor work

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

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

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