Electrical Machines
Which of following components of a DC generator plays vital role for providing direct electric current of a DC generator?

 Dummy coils.
 Eye bolt.
 Equalizer rings.
 Commutator.

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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

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

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Electrical Machines
If two 8-pole dc machines of identical armature sare wound, one with lap winding and the other with wave winding, then

 lap-wound machine will have more rated voltage and more current
 lap-wound machine will have more rated voltage and less current
 wave-wound machine will have more rated voltage and less current
 wave-wound machine will have more rated current and more voltage

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