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Electrical Machines

Electrical Machines
The material used for commutator brushes is mostly

  carbon.
 mica.
 copper.
 cast iron.

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Electrical Machines
At what power factor, the voltage regulation of a transformer can be zero ?

 Zero power factor.
 Lagging power factor.
 Unity power factor.
  Leading power factor.

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Electrical Machines
An IM cannot run at synchronous speed because

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

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Electrical Machines
A 250 V DC generator in run at rated speed with no excitation. The open circuit voltage will be

  zero.
  250 V.
  very small, say about 2 or 3 V.
 about 100 V.

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Electrical Machines
If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary?

  It will becomes four times.
 It will remain the same.
  It will be doubled.
  It will be halved.

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Electrical Machines
In a DC generator the actual flux distribution depends upon

  shape of the pole shoe.
 size of air gap.
  all of above.
  clearance between tips of the adjacent pole shoes.

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MORE MCQ ON Electrical Machines

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