What makes up compound generators?

Compound generators are characterized by their construction, which includes both shunt and series field windings. This configuration allows for both the advantages of shunt and series excitation to be utilized, enabling a more stable voltage output under varying load conditions.

The shunt field winding is connected in parallel with the armature windings, providing a relatively constant magnetic field as the load changes. This helps maintain voltage stability when the generator is under load. In contrast, the series field winding is connected in series with the armature, meaning that it provides additional magnetism that is proportional to the load current. This results in enhanced output voltage during higher load conditions, which helps to boost voltage when necessary.

The combination of these two types of windings allows compound generators to effectively balance the stability required at low loads (from the shunt winding) and the ability to handle higher loads without significant voltage drop (from the series winding). Hence, the correct answer is that compound generators are made up of both shunt and series fields.