Electrical Machines
What is the mechanical power developed by a DC series motor is maximum?

 Back emf is equal to half the applied voltage.
 Back emf is equal to zero.
 None of above.
 Back emf is equal to applied voltage.

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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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