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For the same values of peak pressure, peak temperature and heat rejection, the correct order of efficiencies for Otto, Dual and Diesel cycles is

  1. $\eta _{\text{Otto}}> \eta _{\text{Dual}}> \eta _{\text{Diesel}}$
  2. $\eta _{\text{Diesel}}> \eta _{\text{Dual}}> \eta _{\text{Otto}}$
  3. $\eta _{\text{Dual}}> \eta _{\text{Diesel}}> \eta _{\text{Otto}}$
  4. $\eta _{\text{Diesel}}> \eta _{\text{Otto}}> \eta _{\text{Dual}}$
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