Second Law Statement
Hardphysics
Kelvin-Planck statement forbids a heat engine that?
Select the correct option:
Solution
Incorrect! Answer:
Converts all heat from single reservoir into work
- Second Law of Thermodynamics: Defines the direction of spontaneous processes and limits of heat engines.
- 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.
- Meaning: Efficiency can never be 100%. Some heat must be rejected to a colder reservoir (sink).
- Clausius Statement: (Option 3) Forbids spontaneous heat transfer from cold to hot. Both statements are logically equivalent.
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About This Question
- Subject
- physics
- Chapter
- thermodynamics
- Topic
- second law statement
- Difficulty
- Hard
- Year
- 2025
Solution
Correct Answer:
Converts all heat from single reservoir into work
- Second Law of Thermodynamics: Defines the direction of spontaneous processes and limits of heat engines.
- 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.
- Meaning: Efficiency can never be 100%. Some heat must be rejected to a colder reservoir (sink).
- Clausius Statement: (Option 3) Forbids spontaneous heat transfer from cold to hot. Both statements are logically equivalent.
This hard difficulty physics question is from the chapter thermodynamics, covering the topic of second law statement. It appeared in the 2025 exam.
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