Red Seal Electrician Practice
TransformersQuestion 1091 of 1506

A plant needs to change 60 Hz power to another frequency. Which device from this section can do this, and a transformer cannot?

  1. A motor-generator set
  2. A step-up transformer
  3. An isolation transformer
  4. An autotransformer
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Correct answer: A motor-generator set

A transformer changes voltage and current levels only. A motor-generator set can also convert one frequency to another.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 10.2: Step-up and Step-down Transformers

Practice transformers

Questions last reviewed: 18 October 2026