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

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

1.Efficiency of a heat engine can never be zero

2.Efficiency of a heat engine can never be unity

3. Efficiency of a heat engine is always unity

4.None of the above

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