Engineering Thermodynamics
The efficiency of a gas turbine is given by

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

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Engineering Thermodynamics
First law of thermodynamics

Enables to determine change in internal energy of the system
Provides relationship between heat, work and internal energy
All of these
Does not enable to determine change in entropy

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