Electrical Engineering XYZ MCQs
In which of the following generators negative voltage regulation can occur:
- Series generators
- Over compound generator
- Both of the above
- Shunt generator
Correct answer: 3. Both of the above
Explanation:
- Series Generators: Series generators have a field winding connected in series with the armature winding. They exhibit negative voltage regulation because as the load increases, the armature current increases, which strengthens the magnetic field. This increased magnetic field results in higher generated voltage, compensating for the voltage drop across the load, leading to a decrease in terminal voltage. Therefore, in series generators, voltage regulation is typically negative.
- Over Compound Generator: Over compound generators have both series and shunt field windings. They exhibit negative voltage regulation under certain conditions. If the series field winding is wound in such a way that its effect opposes the effect of the shunt field winding, then as the load increases, the shunt field weakening dominates, causing the terminal voltage to drop. This results in negative voltage regulation.