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The stoichiometric air-fuel ratio for petrol is approximately

  • A.1.47 to 1 by mass
  • B.14.7 to 1 by mass
  • C.9.0 to 1 by mass
  • D.22.0 to 1 by mass

Answer: B

It is the ratio at which there is exactly enough air to burn the fuel completely with none left over. A three-way catalyst works only within about one per cent of this point, which is the whole reason for the lambda sensor and its feedback loop.

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