Engineering Thermodynamics
The efficiency of a gas turbine is given by

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

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Engineering Thermodynamics
First law of thermodynamics

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

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