AC theoryQuestion 1055 of 1506

A 60 Hz system has a symmetrical distorted current waveform. Which harmonics does it contain?

  1. Odd harmonics only
  2. Even harmonics only
  3. All harmonics equally
  4. No harmonics
Show answer

Correct answer: Odd harmonics only

Symmetry above and below the centreline removes the even multiples.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 7.7: Harmonics in Polyphase Power Systems

Practice ac theory

Questions last reviewed: 18 October 2026