MotorsQuestion 1444 of 1506

A 4-pole induction motor runs on a 60 Hz supply. What is its synchronous speed?

  1. 480 rpm
  2. 900 rpm
  3. 3600 rpm
  4. 1800 rpm
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Correct answer: 1800 rpm

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

Source: Computed, 13.2: Synchronous Motors

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Questions last reviewed: 18 October 2026