Electrical Machines
If the temperature of armature resistance is increased, the speed of a series motor would

 increase.
 decrease.
 not change.
 None of above.

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Electrical Machines
Cogging in induction motor occurs when

 number of stator teeth - number of rotor teeth = 0.
 number of stator teeth - number of rotor teeth = odd number.
 number of stator teeth - number of rotor teeth = even number.
 number of stator teeth - number of rotor teeth = negative number.

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Electrical Machines
The damper windings also called the squirrel cage windings or damper grids

  both (A) and (B).
  consists of short-circuited copper bars embedded in the field pole faces.
  are provided on the stator for improving power factor.
  are provided in a synchronous motor to make it self starting.

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