Engineering Thermodynamics
A definite area or a space where some thermodynamic process takes place is known as

Thermodynamic system
Thermodynamic law
Thermodynamic cycle
Thermodynamic process

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Engineering Thermodynamics
The work ratio of a gas turbine plant is given by

(Isentropic increase in temperature)/(Actual increase in temperature)
(Actual temperature drop)/(Isentropic temperature drop)
(Net work output)/(Work-done by the turbine)
(Net work output)/(Heat supplied)

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