MotorsQuestion 1454 of 1506

A motor has a synchronous speed of 1200 rpm and runs at 1152 rpm at full load. What is the slip?

  1. 96.0 %
  2. 4.00 %
  3. 4.17 %
  4. 40.0 %
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Correct answer: 4.00 %

Slip = (Ns − N) ÷ Ns × 100 = (1200 − 1152) ÷ 1200 × 100 = 4.00 %.

Source: Computed, 13.7: Tesla Polyphase Induction Motors

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Questions last reviewed: 18 October 2026