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Electrical Machines

Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  linear.
  cage.
  none of these.
  wound.

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Electrical Machines
In DC generators, the brushes remain in contact with conductors which

 there is no hard and fast rule for this.
 lie under south pole.
 lie in the inter polar gaps.
 lie under north pole.

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Electrical Machines
In alternator, the rotary part is

  magnetic field poles.
 none of these.
 core.
 armature.

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Electrical Machines
When excitation is increased (over excitation), the synchronous generator operates at

 unity power factor.
 any of the above.
 leading power factor.
 lagging power factor.

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Electrical Machines
In DC series motor the speed is ______________ proportional to the armature current.

 directly.
 has no relation.
 none of these.
 inversely.

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Electrical Machines
The noise resulting from vibrations of lamination set by magnetic forces, is termed as

 magnetostriction.
 boo.
  hum.
 zoom.

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