Red Seal Electrician Practice
TransformersQuestion 1046 of 1506

Which transformer connection lets a three-phase source with no neutral supply both line-to-line and line-to-neutral voltages on the secondary?

  1. Delta primary, Y secondary
  2. Delta primary, delta secondary
  3. Y primary, delta secondary
  4. Open delta
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Correct answer: Delta primary, Y secondary

Only the Y secondary has a neutral point to give two voltages.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 7.6: Three-phase Transformer Circuits

Practice transformers

Questions last reviewed: 18 October 2026