Q. The compensating windings used in DC generators are to

A
Reduce the eddy current flow through the rotor windings
B
Reduce the effect of hysteresis loss
C
Nullify the arcing during commutation
D
Neutralize the effect of armature reaction
Solution:

In order to neutralize the cross magnetizing effect of armature reaction, a compensating winding is used. The compensating windings consist of a series of coils embedded in slots in the pole faces. These coils are connected in series with the armature. The arrangement is shown in the diagram.

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