Electrical Machines
Which of the following represents the rotating losses of machine?

 All of the them
 Friction and windage losses
 Hysteresis losses
 Eddy current losses

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

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