Marine Electrical Systems USCG Question #789 (Set 27)

Which of the following pictures represents a magnetic reversing or two-speed motor starter? EL-0179

USCG Exam Illustration EL-0179
USCG Examination Diagram: Illustration EL-0179
Official USCG Answer & Rule Citation

Correct Answer: Option D — D

Magnetic reversing and two-speed motor starters utilize interlocking contactors and overload relays configured per IEEE 45 standards to change phase rotation or winding configurations safely, preventing simultaneous forward-reverse or high-low speed activation that would cause catastrophic electrical short circuits.

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