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The cut-off ratio in the Diesel cycle is the ratio of

  • A.Compression to expansion ratio
  • B.Volume after heat addition to volume before it
  • C.Maximum to minimum pressure
  • D.Maximum to minimum temperature

Answer: B

A larger cut-off ratio means heat is added over a greater part of the expansion stroke, which lowers the cycle efficiency. Efficiency therefore falls as the engine is loaded more heavily, which is a genuine difference from the ideal Otto cycle.

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