Question

In power generators, three armature coils are arranged around the field magnet at an angular separation of ____

• A. ${120}^{\circ }$
• B. ${90}^{\circ }$
• C. ${100}^{\circ }$
• D. ${360}^{\circ }$

Answer 1

The correct option is A

${120}^{\circ }$

Three-phase generator is a common method of alternating current electric power generation, transmission, and distribution. In power generators, three armature coils are arranged around the field magnet at an angular separation of ${120}^{\circ }$ as shown in the given diagram. It's working principle is based on the mutual induction between stator and rotor windings.

When the field magnet rotates, three alternating currents of different phases are generated simultaneously in all the three armatures.