Engineering Thermodynamics
The efficiency of a gas turbine is given by

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

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Engineering Thermodynamics
According to Dalton's law, the total pressure of the mixture of gases is equal to

Sum of the partial pressures of all divided by average molecular weight
Average of the partial pressures of all
Greater of the partial pressures of all
Sum of the partial pressures of all

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