Marine Electrical Systems USCG Q#37 (Set 2)

What is the characteristic of a wound-rotor induction motor, with a high resistance inserted in series with the rotor winding at startup?

Official USCG Answer & Rule Citation

Correct Answer: Option B — relatively high starting torque and low stator current

Adding high external resistance to the rotor circuit of a wound-rotor induction motor shifts the breakdown torque point to zero speed, resulting in high starting torque while limiting initial stator inrush current.

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