Engineering Thermodynamics
Otto cycle consists of

Two constant pressure and two isentropic processes
One constant pressure, one constant volume and two isentropic processes
Two constant volume and two isothermal processes
Two constant volume and two isentropic 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 temperature of the air in room will remain unaffected
The room will be cooled to the temperature inside the refrigerator
The room will be cooled very slightly

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