Electrical mathQuestion 1250 of 1506

An induction motor has a synchronous speed of 1800 rpm and runs at 1728 rpm. What is its slip?

  1. 4%
  2. 2%
  3. 6%
  4. 72%
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Correct answer: 4%

Slip = (1800 - 1728) / 1800 = 72 / 1800 = 0.04, which is 4%.

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

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Questions last reviewed: 18 October 2026