Speed of DC motor can be controlled by varying

Electrical Engineering XYZ MCQs

Speed of DC motor can be controlled by varying:

  1. Its flux or pole
  2. Resistance of armature culture
  3. Applied voltage
  4. All of these

Correct answer: 4. All of these


  1. Flux control: Speed can be adjusted by varying the magnetic flux in the motor. Decreasing the flux increases the speed, and increasing the flux decreases it.
  2. Armature resistance control: Adding resistance in the armature circuit allows you to control the speed by reducing the current through the motor, which directly affects the speed.
  3. Applied voltage control: By changing the voltage supplied to the motor, you can directly influence its speed. Higher voltages increase speed, while lower voltages decrease it.

Hence, the speed of a DC motor can be controlled by adjusting the flux, the armature resistance, or the applied voltage.

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