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

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Engineering Thermodynamics
In order that a cycle be reversible, following must be satisfied

All of these
When heat is being absorbed, temperature of hot source and working substance should be same
When beat is being rejected, temperature of cold source and working substance should be same
Free expansion or friction resisted expansion/compression process should not be encountered

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