Which statement best describes the operation of a synchronous motor?

The operation of a synchronous motor is characterized by its ability to run at a speed that is directly synchronized with the frequency of the supply power line. This means that the motor's rotor turns at the same rate as the rotating magnetic field produced by the stator, which is determined by the frequency of the alternating current (AC) supply. This synchronization allows the motor to maintain a constant speed under varying load conditions, provided that the load does not exceed its design capacity.

When considering other options, the requirement for periodic speed adjustments is not applicable to synchronous motors, as they are designed to maintain a stable operational speed in relation to supply frequency. Additionally, while some forms of power generation, such as solar energy, can be harnessed to drive motors, synchronous motors are not exclusively powered by this energy source. Furthermore, the use of synchronous motors is not limited to heavy-duty industrial applications; they can also be found in various settings, including commercial and residential, depending on power needs.