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Exhaust gas recirculation reduces oxides of nitrogen by

  • A.Adsorbing them on a catalyst
  • B.Raising the air-fuel ratio
  • C.Lowering the peak flame temperature
  • D.Oxidising them in the exhaust manifold

Answer: C

Recirculated exhaust absorbs heat without taking part in combustion, so the peak temperature falls and thermal formation with it. Too much of it costs power and drivability, so the rate is scheduled against load and speed.

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