second law statement

Question

Kelvin-Planck statement forbids a heat engine that?

RankGuru · Accepted Answer

1. **Second Law of Thermodynamics**: Defines the direction of spontaneous processes and limits of heat engines.
2. **Kelvin-Planck Statement**: It is impossible to construct an engine which, operating in a cycle, will produce no other effect than the extraction of heat from a single reservoir and the performance of an equivalent amount of work.
3. **Meaning**: Efficiency can never be $100\%$. Some heat **must** be rejected to a colder reservoir (sink).
4. **Clausius Statement**: (Option 3) Forbids spontaneous heat transfer from cold to hot. Both statements are logically equivalent.

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second law statement

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More second law statement Practice Questions

According to the Second Law of Thermodynamics, which of the following processes are forbidden?