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Lambda in engine control is defined as

  • A.The exhaust temperature divided by the inlet temperature
  • B.The catalyst conversion efficiency
  • C.The actual air-fuel ratio divided by the stoichiometric ratio
  • D.The fuel flow divided by the air flow

Answer: C

A lambda of one is stoichiometric, above one is lean and below one is rich. Expressing the mixture this way makes the same number meaningful for any fuel, since each fuel's own stoichiometric ratio is built into the definition.

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