Engineering Thermodynamics
Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle

Heat rejection is lower
Combustion is at constant volume
Maximum temperature is higher
Expansion and compression are isentropic

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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
Sum of the partial pressures of all
Greater of the partial pressures of all

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