Red Seal Electrician Practice
TransformersQuestion 1134 of 1506

Harmonics from nonlinear loads can cause a distribution transformer to overheat. What rating shows that it was built to handle a certain level of harmonics?

  1. Power factor
  2. Class A insulation
  3. Turns ratio
  4. K factor
Show answer

Correct answer: K factor

Harmonics are higher than the design frequency and raise losses. The K factor rating shows harmonic capability.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 10.8: Practical Considerations - Transformers

Practice transformers

Questions last reviewed: 18 October 2026