Question

Exact purpose of compensating winding in a DC generator is _________

(a) Mainly to reduce the eddy currents by providing local short-circuits

(b) To provide path for the circulation of cooling air

(c) To neutralise the cross-magnetising effect of the armature reaction

(d) Cannot be determined

I have been asked this question in an internship interview.

I would like to ask this question from Ways to Reduce Effects of Armature Reaction topic in portion Armature Reaction of DC Machines

Answer 1

The correct choice is (c) To neutralise the cross-magnetising effect of the armature reaction

For explanation I would say: Armature reaction can be reduced with the help of compensating winding. To neutralize the cross-magnetizing effect of armature reaction in a DC machine, a compensating winding is used. The compensating windings consist of a series of coils embedded in slots of the pole faces.