Assuming that a three phase synchronous motor is separately excited, what statement is true concerning power supplies?

Correct Answer: Option C — The rotor winding via slip rings and brushes is connected to a DC power source, and the stator windings are directly connected to a three phase AC power source.

Separately excited synchronous motors require a three-phase AC power source connected directly to the stator windings to establish a rotating magnetic field. The rotor winding requires a direct current (DC) source supplied through slip rings and brushes to create fixed North and South magnetic poles interacting with the stator field.