Red Seal Electrician Practice
TransformersQuestion 1049 of 1506

What is a V (open-delta) transformer bank?

  1. A Y-Y bank with a missing neutral
  2. A delta-delta bank that uses only two transformers
  3. A bank of four transformers
  4. A single-phase bank with a centre tap
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Correct answer: A delta-delta bank that uses only two transformers

One winding is left out on both sides, and the two units carry the load.

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

Practice transformers

Questions last reviewed: 18 October 2026