Of given options, the demagnetization effects which of the following:
- Reduces the terminal voltage
- Reduction in main field flux
- Both 1 and 2
- Commutation only
Correct answer: 3. Both 1 and 2
Explanation: Demagnetization is an outcome of armature reaction. Through vector addition, it is determined that demagnetization decreases or attenuates the primary field flux. Consequently, this leads to a reduction in the induced electromotive force (EMF) or terminal voltage in the case of a generator, as Eg is directly proportional to the flux (φ). In the case of a motor, it diminishes the torque and elevates the speed, as Te is proportional to the flux, and the speed (N) is inversely proportional to the flux.