Thermal efficiency of a Carnot engine can approach 100%, only when the temperature of the__________________?
Correct answer: B. Either A. or B
- A. Cold reservoir approaches zero
- B. Either A. or B
- C. Hot reservoir approaches infinity
- D. Neither A. nor B
Explanation
Carnot efficiency is η = 1 − Tc/Th, so it approaches unity if the cold-reservoir temperature approaches absolute zero or the hot-reservoir temperature approaches infinity. Therefore, either condition can theoretically give 100% efficiency.
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