Question 231Electricity & Electronics - Assistant Engineer

The correct answer is C. In a separately excited synchronous motor, the rotor winding is connected to a DC power source via slip rings and brushes, while the stator windings are directly connected to a three-phase AC power source. This arrangement allows the rotor's magnetic field to be controlled independently of the stator's rotating magnetic field, enabling precise control of the motor's speed and torque. The other options are incorrect because they do not accurately describe the power supply connections for a separately excited synchronous motor. For example, option A has the rotor connected to a three-phase AC source, which is not the case, and option B has the rotor connected to a single-phase AC source, which is also incorrect.