Engineering Thermodynamics
A perpetual motion machine is

A non-thermodynamic machine
A thermodynamic machine
A hypothetical machine whose operation would violate the laws of thermodynamics
A hypothetical machine

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Engineering Thermodynamics
Otto cycle consists of

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

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