Electrical Machines
What does happen if tripled harmonics given to induction motor?

  Fail to start.
  Will results in open circuit.
  Nothing will happen.
  Will results in short circuit.

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

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

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