TransformersQuestion 1132 of 1506

A transformer for 400 Hz service is compared with one for 60 Hz. Which difference is needed in the core?

  1. Thicker laminations
  2. A solid iron core
  3. Thinner laminations
  4. No insulation between sheets
Show answer

Correct answer: Thinner laminations

Eddy current losses rise with frequency, so higher-frequency transformers need thinner laminations.

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

Practice transformers

Questions last reviewed: 18 October 2026