Red Seal Electrician Practice
MotorsQuestion 1292 of 1506

A single-phase motor with no start winding is turned by hand and then runs. What does this show?

  1. The coil makes torque once the rotor is already turning.
  2. The coil makes a rotating field when the rotor is at rest.
  3. The rotor has a wound winding with slip rings.
  4. The motor is a synchronous type with a magnet rotor.
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Correct answer: The coil makes torque once the rotor is already turning.

Torque appears once the rotor is moving, but there is none at rest.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 13.9: Single-phase Induction Motors

Practice motors

Questions last reviewed: 18 October 2026