Engineering Thermodynamics
A perpetual motion machine is

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

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Engineering Thermodynamics
Which of the following statement is correct according to Clausis statement of second law of thermodynamics?

It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature by using refrigeration cycle.
It is impossible to transfer heat from a body at a lower temperature to a body at a higher temperature, without the aid of an external source.
It is possible to transfer heat from a body at a lower temperature to a body at a higher temperature.
None of these

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