Marine Electrical Systems USCG Question #723 (Set 25)

As shown in figures "A", "B", "C", and "D" of the illustration, what is the usual means by which the rotation direction of the motor is reversed? EL-0207

USCG Exam Illustration EL-0207
USCG Examination Diagram: Illustration EL-0207
Official USCG Answer & Rule Citation

Correct Answer: Option D — Interchanging leads T5 and T8

Standard three-phase induction motor rotation is reversed by swapping any two supply leads. In dual-voltage motor configurations, interchanging leads T5 and T8 effectively reverses the current flow through the secondary winding relative to the primary, thereby changing the direction of the rotating magnetic field and the motor's shaft rotation.

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