MotorsQuestion 1451 of 1506

A motor on a 60 Hz supply has a synchronous speed of 1800 rpm. How many poles does it have?

  1. 2 poles
  2. 4 poles
  3. 8 poles
  4. 6 poles
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Correct answer: 4 poles

P = 120 × f ÷ Ns = 120 × 60 ÷ 1800 = 4 poles.

Source: Computed, 13.2: Synchronous Motors

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Questions last reviewed: 18 October 2026