UCLA · MAE105A

Entropy, the Second Law, and Carnot Cycles — MAE105A

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MAE105A Thermodynamics · University of California, Los Angeles

This UCLA MAE105A Thermodynamics quiz covers entropy, the Second Law of Thermodynamics, and Carnot cycles, testing understanding of the Clausius inequality, Kelvin-Planck statement violations, T-S diagrams, heat engine efficiency limits, and free expansion processes.

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According to the Clausius inequality, what is the value of the cyclic integral of δQ/T for an arbitrary thermodynamic cycle operating between thermal reservoirs?

It is equal to zero for all cycles because entropy is a state function.
It is equal to zero for a reversible cycle and less than zero for an irreversible cycle.
It depends exclusively on the total mechanical work produced during the complete cycle.
It is always strictly positive for real systems.

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