Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is

 interpole winding
 interpole and compensating windings together
 armature winding
 field winding

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Electrical Machines
A dc shunt generator, when commissioned after a major repair of the field system, failed to build Up voltage. It was because

 field winding was wrongly connected
 there was a break in the armature circuit
 field system lost residual magnetism
 field resistance was higher than critical resistance

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