Red Seal Electrician Practice
TransformersQuestion 1061 of 1506

What problem can harmonic content cause in any AC power transformer?

  1. Overheating from eddy current losses
  2. Loss of the primary winding
  3. A drop in the supply frequency
  4. Reversal of the phase sequence
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Correct answer: Overheating from eddy current losses

This applies to single-phase as well as polyphase systems.

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

Practice transformers

Questions last reviewed: 18 October 2026