Compressors, Gas Turbines and Jet Engines
The work ratio of a gas turbine plant is defined as the ratio of

Net work output and work done by turbine
Net work output and isentropic heat drop
Net work output and heat supplied
Actual heat drop and isentropic heat drop

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

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