Engineering Thermodynamics
Compressed air coming out from a punctured football

Remains at the same temperature
May become hotter or cooler depending upon the humidity of the surrounding air
Becomes hotter
Becomes cooler

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Engineering Thermodynamics
Otto cycle consists of

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

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