Electrical Machines
In a DC machine the armature mmf is

  stationary with respect to field poles.
  rotating with respect to field poles as well as armature.
 rotating with respect to field poles.
  stationary with respect to armature.

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Electrical Machines
The coil spam

  may or may not be exactly equal to people pitch.
 must be exactly equal to people pitch.
 can never be equal to pole pitch.
 none of above.

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Electrical Machines
In a loaded DC generator, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

 improve with rise in terminal voltage.
 deteriorate with rise in terminal voltage.
 deteriorate with fall of terminal voltage.
 improve with fall of terminal voltage.

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