Discussion
Which effect does insufficient dwell have at high engine speed?
Answer: B
There is less time per cycle at speed, so a short dwell leaves the coil undercharged and the engine misfires. That is the classic high speed misfire of a points system. Electronic systems control dwell actively. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Most errors here come from carrying across a result from a neighbouring case where it does not hold. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.
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