The term MOST-Likely used to describe the ratio of the engine's actual air-fuel mixture in the exhaust to what would be an ideal, or stoichiometric, mixture is:

Question

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Lambda (λ) is the term used to describe the ratio of the engine's actual air-fuel mixture in the exhaust to what would be an ideal, or stoichiometric, mixture. Lambda is calculated by dividing the measured air-fuel ratio by the stoichiometric air-fuel ratio. A lambda value of 1.0 indicates that the engine is running at stoichiometry, while values above or below 1.0 indicate either a lean or rich air-fuel mixture, respectively. Therefore, D) lambda is the correct choice.

The Term MOST-Likely Used to Describe the Ratio of the Engine's