AC generationQuestion 523 of 1506

What speed does a six-pole alternator need to produce 60 Hz?

  1. 600 RPM
  2. 1200 RPM
  3. 3600 RPM
  4. 1800 RPM
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Correct answer: 1200 RPM

N = 120 f / P = 120 x 60 / 6 = 1200 RPM.

Source: Trigonometry and Single Phase AC Generation for Electricians (Flinn), 3.5: Frequency and Alternators

Practice ac generation

Questions last reviewed: 18 October 2026