Red Seal Electrician Practice
MotorsQuestion 1287 of 1506

What happens to the rotor resistance of a wound rotor motor after it has started?

  1. It is shorted out, so the rotor acts like a squirrel cage.
  2. It is doubled in value to cut the current in the rotor.
  3. It is connected across the supply line.
  4. It is replaced by a capacitor in the rotor circuit.
Show answer

Correct answer: It is shorted out, so the rotor acts like a squirrel cage.

Running with the resistance in would waste power and lower the torque at full speed.

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

Practice motors

Questions last reviewed: 18 October 2026