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A chamber has a residence time of 4 milliseconds at cruise. At idle the mass flow falls to a quarter with the same volume, giving a residence time of approximately

  • A.16 ms
  • B.1 ms
  • C.4 ms
  • D.8 ms

Answer: A

Residence time varies inversely with mass flow for a fixed volume, so quartering the flow quadruples it. The longer time helps completeness at idle but the low pressure and temperature there work against it, which is why carbon monoxide peaks at idle regardless.

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