Red Seal Electrician Practice
Motor controlsQuestion 115 of 1506

In a reversing circuit, how does a reversal of the phase sequence reverse a three-phase motor?

  1. Two of the three phase wires are swapped at the motor
  2. All three phase wires are removed and then put back on
  3. The motor is supplied by DC instead of by AC
  4. One phase is connected to ground at the motor terminals
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Correct answer: Two of the three phase wires are swapped at the motor

The M2 contactor swaps phases A and B, so the motor spins the other way.

Source: Lessons in Electric Circuits IV: Digital (Kuphaldt), 6.3: Permissive and Interlock Circuits

Practice motor controls

Questions last reviewed: 18 October 2026