The ? motor is a 3-phase motor in which the rotor turns at the same speed as the magnetic field of the stator.

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Multiple Choice

The ? motor is a 3-phase motor in which the rotor turns at the same speed as the magnetic field of the stator.

Explanation:
Rotor speed matching the stator’s rotating magnetic field means zero slip, which defines a synchronous operation. In a three‑phase system, the stator windings create a rotating magnetic field at a specific synchronous speed determined by the supply frequency and pole count; the rotor, whether a permanent magnet or DC‑excited, locks to that field and turns at the same rate. If the rotor lagged behind, that would be an induction (asynchronous) motor where slip exists. A stepper motor is designed to move in discrete steps, not to run continuously locked to the field, and a universal motor is a different kind of DC/AC machine. So the described motor is synchronous.

Rotor speed matching the stator’s rotating magnetic field means zero slip, which defines a synchronous operation. In a three‑phase system, the stator windings create a rotating magnetic field at a specific synchronous speed determined by the supply frequency and pole count; the rotor, whether a permanent magnet or DC‑excited, locks to that field and turns at the same rate. If the rotor lagged behind, that would be an induction (asynchronous) motor where slip exists. A stepper motor is designed to move in discrete steps, not to run continuously locked to the field, and a universal motor is a different kind of DC/AC machine. So the described motor is synchronous.

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