Discussion
Statement I: A three-way catalyst requires closed loop fuelling control.
Statement II: It can oxidise and reduce simultaneously only within about one per cent of stoichiometric.
In the light of the above statements, choose the correct answer.
Answer: C
Correct answer: Both Statement I and Statement II are correct
Both are true and the second is the reason for the first. The three-way catalyst must oxidise carbon monoxide and hydrocarbons while simultaneously reducing nitrogen oxides, and those requirements conflict: oxidation wants oxygen, reduction wants none.
Only within a narrow window around stoichiometric does the exhaust suit both. Holding the mixture there needs a lambda sensor and closed loop control, oscillating rapidly about the target - which is why the catalyst and the sensor arrived together.
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