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Electrical Machines

Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 16KVA
 0KVA
 4KVA
 20KVA

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Electrical Machines
Sparkless commutation can be achieved by employing

  inter poles.
  any one or more of the above methods.
 compensating winding.
  high resistance carbon brushes.

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Electrical Machines
The slip of an induction motor normally does not depend on

  synchronous speed.
  rotor speed.
  core loss component.
  shaft torque.

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Electrical Machines
In a synchronous motor, damper windings are provided on

  pole faces.
None of these
  rotor shaft.
  stator frame.

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Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

 0.512.
 0.649.
 0.443.
  0.573.

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Electrical Machines
For which of the following loads, armature reaction is magnetizing in nature?

None of these
 pure inductive load
 pure capacitive load
 pure resistive load

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