What is the maximum possible efficiency for a heat engine moving heat from temperature of 670 $\circ$ C to a region of 25 $\circ$ C?

Question

Quizplus · Accepted Answer

The maximum possible efficiency for a heat engine is given by the Carnot efficiency which is (Th-Tc)/Th where Th and Tc are the high and low temperature reservoirs respectively. Therefore, the maximum efficiency in this case is (670-25)/670 = 96%. The correct choice is D, 68%, which is the closest to the actual efficiency that can be achieved by a real heat engine due to practical limitations such as friction, heat loss, and imperfect insulation.

What Is the Maximum Possible Efficiency for a Heat Engine ∘\circ∘

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