Red Seal Electrician Practice
TransformersQuestion 210 of 1506

A technician services a ferroresonant transformer. Which hazard comes from its resonant winding and capacitor?

  1. A sudden shift to DC at the output
  2. Dangerously high working voltages
  3. A leak of hot core oil onto the floor
  4. Loss of all electrical isolation
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Correct answer: Dangerously high working voltages

The resonant circuit builds very high voltage, so it needs costly capacitors and care from the technician.

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

Practice transformers

Questions last reviewed: 18 October 2026