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The three regulated pollutants a three-way catalytic converter treats are

  • A.Carbon monoxide, hydrocarbons and oxides of nitrogen
  • B.Carbon dioxide, water and nitrogen
  • C.Particulate, sulphur dioxide and lead
  • D.Carbon monoxide, sulphur dioxide and ozone

Answer: A

The converter oxidises the first two and reduces the third, all on the same catalyst bed. Doing both at once is only possible within a narrow band of air-fuel ratio, which is why the device depends absolutely on closed loop fuelling control.

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