The correct answer is D. All of the above reasons.
The armature of a synchronous machine is located on the stator, while the field winding is located on the rotor. The armature is associated with large power as compared to the field circuits. This is because the armature windings are connected to the power source, while the field windings are connected to a DC source. The field windings only need to provide enough current to create the magnetic field, while the armature windings need to provide enough current to carry the load.
The armature is also located on the stator because it is difficult to provide high voltage insulation on the rotor. The rotor is rotating at high speed, and any insulation would be subject to a lot
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