Engineering Thermodynamics
Which of the following is the correct statement?

All the reversible engines have the same efficiency.
All engines are designed as reversible in order to obtain maximum efficiency.
All the reversible and irreversible engines have the same efficiency.
Irreversible engines have maximum efficiency.

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

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

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