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Electrical Machines

Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 120°.
 30°.
 60°.
 90°.

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Electrical Machines
If a DC motor is connected across the AC supply it will

 Not run.
 Run at normal speed.
 Run at lower speed.
  Burn.

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Electrical Machines
On which of the following factor/factors the speed of a DC motor depends upon?

 Armature current.
 Field flux.
 Applied voltage.
 All of these.

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Electrical Machines
In a DC generator, the ripples in the direct emf generated are reduced by employing

  commutator with large number of segments.
  carbon brushes.
 graphite brushes.
  equalizer rings.

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Electrical Machines
The stator frame in an induction motor is used to

  protect the whole machine.
  hold armature stamping in position.
  provide return path for the flux.
  ventilate the armature.

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Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 lagging
 leading
 zero
 unity

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