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Running an engine rich of stoichiometric increases emissions of

  • A.Carbon monoxide and hydrocarbons
  • B.Oxides of nitrogen only
  • C.Carbon dioxide only
  • D.Sulphur dioxide

Answer: A

There is insufficient oxygen to complete the combustion, so carbon is left partly oxidised and some fuel escapes unburnt. Oxides of nitrogen actually fall on the rich side, because peak temperatures and free oxygen both decline.

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