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For the same compression ratio, the ideal Otto cycle is

  • A.More efficient than the Diesel cycle
  • B.Less efficient than the Diesel cycle
  • C.Equal in efficiency to the Diesel cycle
  • D.Independent of the Diesel cycle for comparison

Answer: A

Constant volume heat addition occurs at a higher average temperature than constant pressure addition does. Real diesel engines nevertheless outperform petrol engines because they run at far higher compression ratios, which more than recovers the theoretical deficit.

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