Discussion
Which condition does a ballast resistor address in a coil ignition system?
Answer: D
The ballast limits the average current when dwell is long, while allowing a low resistance coil that gives a strong spark. Reduced contact burning genuinely is a benefit, which makes the last option a real secondary advantage of the arrangement. The order in which the effects act is what decides the outcome, so it is worth establishing first. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.
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