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The Otto cycle adds heat at constant

  • A.Volume
  • B.Pressure
  • C.Temperature
  • D.Entropy

Answer: A

Combustion in a spark ignition engine is fast enough that the piston barely moves while it happens, so constant volume is a reasonable idealisation. The Diesel cycle by contrast adds heat at constant pressure, which reflects the slower burning of injected fuel as the piston descends.

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