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

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.
None of these
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 possible to transfer heat from a body at a lower temperature to a body at a higher temperature.

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Engineering Thermodynamics
Zeroth law of thermodynamics

Deals with reversibility and irreversibility of process
Deals with heat engines
Deals with conversion of mass and energy
States that if two systems are both in equilibrium with a third system, they are in thermal equilibrium with each other

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