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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Engineering Thermodynamics
Otto cycle consists of

Two constant volume and two isentropic processes
Two constant pressure and two isentropic processes
One constant pressure, one constant volume and two isentropic processes
Two constant volume and two isothermal processes

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Engineering Thermodynamics
The door of a running refrigerator inside a room was left open. Which of the following statements is correct?

The room will be gradually warmed up
The room will be cooled very slightly
The room will be cooled to the temperature inside the refrigerator
The temperature of the air in room will remain unaffected

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