The correct answer is: C. Either armature winding or field winding.
A universal motor is a type of electric motor that can run on both AC and DC power. It is a small, compact motor that is often used in portable appliances such as vacuum cleaners, drills, and saws.
The direction of rotation of a universal motor can be reversed by reversing the flow of current through either the armature winding or the field winding. Reversing the flow of current through the armature winding will cause the motor to rotate in the opposite direction. Reversing the flow of current through the field winding will also cause the motor to rotate in the opposite direction, but the torque will be reduced.
The armature winding is the winding that is connected to the power source. The field winding is the winding that is located around the stator of the motor. The field winding creates a magnetic field that interacts with the magnetic field created by the armature winding to cause the motor to rotate.
The following is a brief explanation of each option:
- Option A: Armature winding. The armature winding is the winding that is connected to the power source. Reversing the flow of current through the armature winding will cause the motor to rotate in the opposite direction.
- Option B: Field winding. The field winding is the winding that is located around the stator of the motor. Reversing the flow of current through the field winding will also cause the motor to rotate in the opposite direction, but the torque will be reduced.
- Option C: Either armature winding or field winding. The direction of rotation of a universal motor can be reversed by reversing the flow of current through either the armature winding or the field winding.
- Option D: None of the above. The direction of rotation of a universal motor can be reversed by reversing the flow of current through either the armature winding or the field winding.