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  1. Which one of the following pairs of equations describes an irreversible heat engine?
    1. ∮ δ Q > 0 and ∮
      δQ
      < 0
      T
    2. ∮ δ Q < 0 and ∮
      δQ
      < 0
      T
    3. ∮ δ Q > 0 and ∮
      δQ
      > 0
      T
    4. ∮ δ Q < 0 and ∮
      δQ
      > 0
      T

Correct Option: A

NA



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