Marine Electrical Systems USCG Question #1266 (Set 43)

As shown in the illustration, what event would give the same indication that would occur when a stern light circuit fuse blows open? EL-0058

USCG Exam Illustration EL-0058
USCG Examination Diagram: Illustration EL-0058
Official USCG Answer & Rule Citation

Correct Answer: Option A — stern light "2" burns out

In a navigation light monitoring circuit, the relay is energized by the current flowing through the lamp filament. If the stern light burns out, the current path is interrupted, causing the relay to drop out. This action closes the trouble circuit, triggering the buzzer and lamp, identical to a fuse failure.

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