Engineering Thermodynamics
A perpetual motion machine is

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

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Engineering Thermodynamics
The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and re-condensed, then the liquid with the next higher boiling point is then evaporated and re-condensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called

Cracking
Fractional distillation
Carbonisation
Full distillation

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