Electrical Machines
In a 3 - Φ IM in order to eliminate cogging the number of stator slots must be

  equal to number of rotor slots.
  unequal to number of rotor slots and skewed in shape.
  either (B) or (C).
  an integral multiple of number of rotor slots.

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Electrical Machines
In a DC shunt generator working on load, the brushes are moved forward in the direction of rotation, as a result of this, commutation will

  improve and terminal voltage will rise .
  worsen and terminal voltage will fall
 improve but terminal voltage will fall.
  worsen and terminal voltage will rise.

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Electrical Machines
What is/are the necessary conditions for voltage build up in self excited generator?

 Field winding resistance should be less than critical resistance.
 Poles should contain residual flux.
All of these
 Field winding should be properly connected to armature winding.

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Electrical Machines
DC Motor

  dc compound motor.
  dc series motor.
  dc shunt motor with field weakening.
  dc shunt with armature resistance control.

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