Marine Electrical Systems USCG Question #420 (Set 14)

What is the function of section "D" of the circuit shown in the illustration? Illustration EL-0085

USCG Exam Illustration EL-0085
USCG Examination Diagram: Illustration EL-0085
Official USCG Answer & Rule Citation

Correct Answer: Option C — a voltage regulator

Section "D" in regulated DC power supplies typically features Zener diodes or integrated semiconductor regulating ICs. This final stage functions as a voltage regulator, maintaining a constant output voltage regardless of input line fluctuations or varying shipboard load demands.

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