In DC generator, armature reaction refers to what?

Electrical Engineering MCQ Electrical Machines MCQ
1

In DC generator, armature reaction refers to what?

A. Effect of armature flux on the main field flux.
B. Effect of field flux on the armature flux.
C. Effect of armature flux on the load.
D. None of the above.

Show Answer

Answer: A

Share your understanding of this question with the correct explanation.

2

In a DC generator, armature reaction refers to the effect of the armature flux on the main field flux. When current flows through the armature winding, it generates a magnetic field known as the armature flux. This armature flux interacts with the main field flux produced by the field winding.

The armature reaction has two primary effects on the main field flux:

  1. Weakening of the main field flux: The armature flux produced by the armature current opposes the main field flux. This opposition weakens the overall main field flux within the machine.
  2. Distortion of the main field flux: The armature flux also causes a distortion in the distribution of the main field flux. The armature flux is usually at right angles to the main field flux, leading to a non-uniform magnetic field distribution.

These effects of armature reaction can have significant consequences on the performance of the DC generator, including changes in the neutral plane, commutation issues, and uneven torque production.

Therefore, the correct answer is option A: “Effect of armature flux on the main field flux.” Armature reaction refers to the influence of the armature flux on the main field flux in a DC generator.