Armature reaction in dc motor results
A. decrease in speed.
B. increase in speed.
C. short circuit.
D. open circuit.
Show Answer
Answer: B
Share your understanding of this question with the correct explanation.
The armature reaction in a DC motor results in an increase in speed.
Armature reaction refers to the magnetic field produced by the armature current, which interacts with the main magnetic field produced by the field winding. This interaction causes a distortion in the main magnetic field, leading to changes in the motor’s performance.
In a DC motor, the armature reaction can lead to a weakening or strengthening of the main magnetic field, depending on the direction of the armature current. If the armature reaction weakens the main field, it reduces the counteracting torque, resulting in an increase in the motor speed. On the other hand, if the armature reaction strengthens the main field, it increases the counteracting torque, which decreases the motor speed.
Therefore, the correct answer is B: increase in speed. Armature reaction in a DC motor can result in an increase in speed due to the interaction between the armature current and the main magnetic field.