Marine Electrical Systems USCG Question #445 (Set 15)

If a digital multimeter is set up as shown in figures "A" and "B" to test a silicon diode, what is the status of the diode if the screen displays OL V when configured as in figure "A" and displays OL V when configured as in figure "B"? Illustration EL-0212

USCG Exam Illustration EL-0212
USCG Examination Diagram: Illustration EL-0212
Official USCG Answer & Rule Citation

Correct Answer: Option C — diode is open

When testing a silicon diode using a digital multimeter's diode test function, an open junction fails to conduct in either direction, resulting in an overload (OL V) display for both forward and reverse bias connections. This confirms a complete internal break within the semiconductor.

100% Free & Open Access — No daily limits, paywalls, or gated answers on BrightMariner.
Back to Marine Electrical Systems Sets