According to the second law of thermodynamics:
A)all heat engines have the same efficiency
B)all reversible heat engines have the same efficiency
C)the efficiency of any heat engine is independent of its working substance
D)the efficiency of a Carnot engine depends only on the temperatures of the two reservoirs
E)all Carnot engines theoretically have 100% efficiency

Question

Quizplus · Accepted Answer

The second law of thermodynamics states that it is impossible for any heat engine to completely convert heat into work. The maximum possible efficiency for a heat engine is given by the Carnot cycle, which depends only on the temperatures of the two reservoirs. Therefore, option D is correct. Options A, B, and E are false statements. Option C is partially true, but it neglects the fact that the efficiency of a heat engine also depends on its operating temperatures, which is taken into account by the Carnot cycle.

According to the Second Law of Thermodynamics