Discussion
Statement I: A knock sensor allows timing to be advanced towards the detonation limit.
Statement II: A knock sensor prevents pre-ignition from occurring.
In the light of the above statements, choose the correct answer.
Answer: D
The sensor hears detonation after the spark and lets the controller retard, but pre-ignition is caused by a hot spot before the spark and cannot be corrected by timing. The two phenomena need different remedies. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Checking which component actually carries the load settles most questions of this kind at once.
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