Power factor and three-phaseQuestion 1021 of 1506

How many different phase sequences are possible in a three-phase system?

  1. One
  2. Three
  3. Two
  4. Six
Show answer

Correct answer: Two

There are only 1-2-3 and 3-2-1. Other orders such as 2-3-1 are the same sequence.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 7.3: Phase Rotation

Practice power factor and three-phase

Questions last reviewed: 18 October 2026