Which type of generator maintains a more stable output under variable load conditions?

A compound generator is designed to maintain a stable output under variable load conditions due to its unique construction, which combines features of both series and shunt generators. The key characteristic of a compound generator is its ability to provide automatic voltage regulation.

In a compound generator, the field coils are arranged in both series and parallel with the armature. The series field coils contribute to a higher magnetic field strength when the load increases, which compensates for voltage drops due to increased current draw. Meanwhile, the shunt field coils ensure a more consistent voltage output during fluctuations in load. This combination allows the compound generator to adjust its output voltage in response to changes in the load, leading to a more stable performance.

The other types of generators do not offer the same level of stability. Series generators, for example, may cause a significant voltage drop under load conditions. Shunt generators can experience reduced output voltage when exposed to varying loads. Capacitor generators are not designed for this specific type of application and are typically used in different contexts, such as power factor correction.

Therefore, the compound generator's hybrid approach effectively manages the fluctuations in voltage while accommodating varying load conditions, making it the ideal choice for maintaining a stable output.