Red Seal Electrician Practice
TransformersQuestion 1116 of 1506

What is a main disadvantage of a ferroresonant transformer?

  1. It wastes a lot of energy and makes much heat.
  2. It cannot hold a constant output voltage when the input varies.
  3. It needs a moving core and a sliding contact to work.
  4. It cannot filter any harmonics from the supply.
Show answer

Correct answer: It wastes a lot of energy and makes much heat.

The saturated core has large hysteresis losses, so it runs hot. It also dislikes frequency changes.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 10.6: Voltage Regulation

Practice transformers

Questions last reviewed: 18 October 2026