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Electrical Machines

Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.05.
  0.1.
  0.5.
  1.0.

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Electrical Machines
Counter emf of a DC motor

 aids applied voltage.
 helps in energy conversion.
 regulates its armature voltage.
 exceeds supply voltage

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Electrical Machines
Which of the following windings are necessary in case of all dc machines?

 closed winding
 open type winding
 lap winding
 wave winding

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Electrical Machines
Lap winding is prefered for which type of machines?

 low current and low voltage
 high current and high voltage
 high current and low voltage
 low current and high voltage

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Electrical Machines
In DC generators brushes are used for

 collecting of current without any sparkings
 convert ac armature current in to dc
 collecting of voltage
 reduce eddy current loss

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Electrical Machines
In a 1-phase induction motor, if the forward torque slip is S, what is the backward torque slip?

 2-S
 1/S
 1-S
 S

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