Electrical Machines
In a DC generator the actual flux distribution depends upon

 size of air gap.
  shape of the pole shoe.
  clearance between tips of the adjacent pole shoes.
  all of above.

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

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Electrical Machines
Commutation in a DC machine may be explained as a process

 by virtue of which emf is induced in the armature conductors.
 how alternate flux affects the main field flux.
  in which magnetic field is set up.
  by which electric current in a coil is reversed.

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