Red Seal Electrician Practice
Motor controlsQuestion 112 of 1506

In a reversing starter, both the forward and reverse pushbuttons are pressed with no interlock. What happens at the power contacts?

  1. Two phases are short-circuited together
  2. The motor runs at double speed
  3. The overload trips on low voltage
  4. The motor runs in forward direction only
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Correct answer: Two phases are short-circuited together

One contactor sends phases A and B straight through and the other swaps them.

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

Practice motor controls

Questions last reviewed: 18 October 2026