Red Seal Electrician Practice
Power factor and three-phaseQuestion 1266 of 1506

What power factor range can a squirrel cage motor have at the instant of starting?

  1. 10% to 25%
  2. 90% to 95%
  3. 50% to 60%
  4. Close to 100%
Show answer

Correct answer: 10% to 25%

The power factor is poor at start and rises as the rotor gains speed.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 13.7: Tesla Polyphase Induction Motors

Practice power factor and three-phase

Questions last reviewed: 18 October 2026