MotorsQuestion 1282 of 1506

What is the purpose of the slip rings on a wound rotor induction motor?

To add resistance to the rotor circuit for starting
To supply DC power to the rotor windings from an outside source
To connect the rotor windings straight to the supply line
To measure the speed of the rotor shaft for a drive

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Correct answer: To add resistance to the rotor circuit for starting

No power goes into the rings. They only give access to the rotor circuit so resistance can be added at start.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 13.8: Wound Rotor Induction Motors

Questions last reviewed: 18 October 2026

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