MotorsQuestion 1248 of 1506

What is the synchronous speed of a motor with one pole pair per phase on a 50 Hz supply?

  1. 3600 rpm
  2. 1500 rpm
  3. 3000 rpm
  4. 1800 rpm
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Correct answer: 3000 rpm

The field turns once per cycle. 50 x 60 = 3000 rpm.

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

Practice motors

Questions last reviewed: 18 October 2026