Electrical Engineering XYZ MCQs
The effect of XYZ on main field flux is armature reaction, here XYZ implies:
- Armature current
- Armature flux
- Armature MMF
- All of these
Correct answer: 2. Armature flux
Explanation: In the context of an electric machine, such as a DC motor or generator, armature reaction refers to the magnetic effect produced by the flow of armature current in the coil windings. The armature current generates its own magnetic field, known as the armature flux. This armature flux interacts with the main field flux, which is produced by the field winding, influencing the overall magnetic field within the machine.
The term “MMF” stands for Magnetomotive Force. Armature MMF refers to the magnetomotive force produced by the armature current. It is the measure of the magnetic potential created by the armature winding. The armature MMF contributes to the modification of the main field flux distribution due to its interaction with the main field.
Therefore, the effect of XYZ on the main field flux is Armature MMF.