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The ideal Otto cycle efficiency depends on

  • A.The compression ratio alone
  • B.The maximum temperature alone
  • C.The heat added per cycle
  • D.The compression ratio and the specific heat ratio

Answer: D

The relation is \( 1 - r^{1-\gamma} \), so efficiency rises with compression ratio and with the specific heat ratio of the working fluid. Notably the quantity of heat added does not appear, which means the ideal efficiency is independent of load.

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