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Carbon monoxide and unburnt hydrocarbons from a combustor are worst

  • A.At idle and low power
  • B.At take-off power
  • C.At cruise
  • D.During shutdown only

Answer: A

Low pressure and temperature at idle slow the reactions and leave the oxidation incomplete. Nitrogen oxides behave in exactly the opposite way, which is why no single operating condition minimises every regulated emission at once.

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