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The ratio of the actual air-fuel ratio to the stoichiometric value is called _____.

  • A.the cetane number
  • B.the octane number
  • C.the equivalence factor
  • D.lambda

Answer: D

A value 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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