Question

What sets the limits on efficiency of a
heat engine?​

Answer 1

Explanation:

The Second Law of Thermodynamics states that there must always be a certain amount of expelled (wasted) heat Qc in proportion to the temperature difference Th−Tc. The Second Law sets an unavoidable limit on the efficiency of any heat engine operating between any two temperatures Th and Tc.

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Answer 2

Answer:

The Second Law of Thermodynamics states that there must always be a certain amount of expelled (wasted) heat Qc in proportion to the temperature difference Th−Tc. The Second Law sets an unavoidable limit on the efficiency of any heat engine operating between any two temperatures Th and Tc.