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Electrical Machines

Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 1 Hz
 2.5Hz
 50Hz
 2HZ

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Electrical Machines
Breather is provided in a transformer to

 provide cold air in transformer.
 absorb moisture from air entering in transformer.
 filter the transformer oil.
  absorb moisture of air during breathing.

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Electrical Machines
An IM cannot run at synchronous speed because

  none of above.
  induction motor will become synchronous motor.
  rotor torque will not be produced.
  air friction will prevent it.

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

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

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Electrical Machines
Copper brushes in DC machine are used

 where low voltage and high currents are involved.
 in both of above cases.
None of these
 where high voltage and low current.

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Electrical Machines
If the excitation is increased, the power factor is

 unity power factor
 lagging power factor
None of these
 leading power factor

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