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Electrical Machines

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

 not run.
 burn.
 run at lower speed.
 run at normal speed.

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Electrical Machines
Autotransformer makes effective saving on copper and copper losses, when its transformation ratio is equal to

  less than one.
  approx to one.
  very low
  greater than one.

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Electrical Machines
The armature of DC machine is made of silicon steel lamination to

 increase the permeability.
 reduce both eddy current and hysteresis loss.
 reduce hysteresis loss only.
 reduce eddy current loss only.

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Electrical Machines
In a synchronous motor hunting can be reduced to minimum possible by

  using a flywheel.
  any of above methods.
  designing the motor for adequate synchronizing power.
  providing damper winding in the rotor pole faces.

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Electrical Machines
Drop in speed from no load to full load is very high in

 Cummulative compound motor with interpoles.
  Series motor without interpoles.
 Series motor with interpoles.
 Shunt motor with interpoles.

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Electrical Machines
In a transformer the magnetic coupling between the primary and secondary winding can be increased by

 increasing the number of turns.
 using soft material for winding.
 using transformer oil of better quality.
 using the magnetic core of low reluctance.

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MORE MCQ ON Electrical Machines

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