Red Seal Electrician Practice
MotorsQuestion 1288 of 1506

Where is most of the heat made during the start of a wound rotor motor?

  1. In the stator slots next to the winding of each phase
  2. In the bearings at each end of the rotor shaft assembly
  3. In the shaft and the key that locks the rotor to it
  4. In the starting resistance outside the motor
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Correct answer: In the starting resistance outside the motor

That is a benefit: the motor stays cooler than a cage motor started the same way.

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

Practice motors

Questions last reviewed: 18 October 2026