Electrical Machines
In a synchronous motor electromagnetic power varies

 directly as square of applied voltage
None of these
 inversely as applied voltage
 directly as applied voltage

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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.
  in which magnetic field is set up.
 how alternate flux affects the main field flux.
  by which electric current in a coil is reversed.

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