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Oxides of nitrogen from a petrol engine peak at an air-fuel ratio

  • A.Exactly at stoichiometric
  • B.Slightly lean of stoichiometric
  • C.Deeply rich
  • D.Deeply lean

Answer: B

A little excess oxygen combined with still-high flame temperature is the worst combination for thermal nitrogen oxide formation. Going leaner still cools the flame and the emission falls away again, which is the basis of lean burn strategies.

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