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

 Commutator.
 Dummy coils.
 Eye bolt.
 Equalizer rings.

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Electrical Machines
Cogging and crawling are phenomena associated with

 the former at a fraction of its rate speed and the latter during starting.
 cage induction machines and they are essentially the same.
 the former during starting and the latter at a fraction of its rated speed.
 any of the above.

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