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Which one of the following pairs of equations describes an irreversible heat engine?

  1. $\oint \delta Q> 0$ and $\oint \dfrac{\delta Q}{T} < 0 \\$
  2. $\oint \delta Q< 0$ and $\oint \dfrac{\delta Q}{T} < 0 \\$
  3. $\oint \delta Q> 0$ and $\oint \dfrac{\delta Q}{T} > 0 \\$
  4. $\oint \delta Q< 0$ and $\oint \dfrac{\delta Q}{T} > 0$
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