Which of the following is correct as per the second law of thermodynamics?

Q. Which of the following is correct as per the second law of thermodynamics?
Answer: Efficiency of a heat engine can never be unity
Notes: The Second Law of Thermodynamics gives a fundamental limitation to the efficiency of a heat engine and the co-efficient of performance of a refrigerator. In simple terms, it says that efficiency of a heat engine can never be unity.

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