Engineering Thermodynamics
The property of a working substance which increases or decreases as the heat is supplied or removed in a reversible manner, is known as

External energy
Enthalpy
Entropy
Internal energy

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

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

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