Which of the following are possible statements of the second law of thermodynami

Question

Which of the following are possible statements of the second law of thermodynamics? It is possible to construct a heat engine operating in a cycle that extracts heat from a reservoir and delivers an equal amount of work. All Carnot engines operating between the same two temperatures have the same efficiency, irrespective of the nature of the working substance. It is possible to construct a refrigerator operating in a cycle whose sole effect is to transfer heat from a cooler object to a hotter one. It is theoretically possible to convert heat into work with 100% efficiency.

Explanation / Answer

All Carnot engines operating between the same two temperatures have the same efficiency, irrespective of the nature of the working substance.

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