Engineering Thermodynamics
Stirling cycle consists of

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

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