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Electrical Machines

Electrical Machines
A DC generator beyond critical resistance will generate

 maximum voltage.
 maximum power.
 maximum current.
 no voltage.

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

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

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Electrical Machines
In a DC generator the emf generated by the armature is maximum when

 induced voltage is high.
  rate of change of flux is maximum.
 shaft rotation is high.
 rate of change of flux is minimum.

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Electrical Machines
Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes :

 1 and 3
 2 and 3
 1, 2 and 3
 1 and 2

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Electrical Machines
Armature of DC machine is made of

 silicon steel.
 insulating material.
 conducting material.
 non-ferrous material.

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Electrical Machines
Dummy coils are used for

 reducing armature reaction.
 increasing efficiency.
All of these
 mechanical balancing.

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MORE MCQ ON Electrical Machines

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