Red Seal Electrician Practice
MotorsQuestion 223 of 1506

At about what share of synchronous speed does a squirrel cage motor show its peak (pull-out) torque?

  1. About 50%
  2. About 20%
  3. About 80%
  4. About 100%
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Correct answer: About 80%

A squirrel cage rotor has its peak torque near 80% of synchronous speed. A wound rotor with high resistance can peak at zero speed.

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

Practice motors

Questions last reviewed: 18 October 2026