Marine Electrical Systems USCG Question #1267 (Set 43)

What is the purpose of the capacitor within component "5" of the circuit shown in figure "B" of the illustration? EL-0081

USCG Exam Illustration EL-0081
USCG Examination Diagram: Illustration EL-0081
Official USCG Answer & Rule Citation

Correct Answer: Option D — prolong the life of the component's contacts

The capacitor in a fluorescent starter or ballast circuit acts as a surge suppressor. By absorbing the inductive kickback generated when the contacts open, it prevents arcing across the switch points. This significantly extends the service life of the contacts, ensuring reliable ignition of the lamp over many operational cycles.

100% Free & Open Access — No daily limits, paywalls, or gated answers on BrightMariner.