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Electrical Machines

Electrical Machines
A generator may loose residual magnetism due to

  vibrations.
  over excitation.
  any of these.
  heating.

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Electrical Machines
The function of field regulator in a DC compound motor is to

 control field current.
 vary the armature resistance.
 limit the armature current.
 none of above.

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Electrical Machines
Which of the following rotor requires damper winding?

 Cylindrical rotor.
None of these
 Salient pole rotor.
 Both type rotor.

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Electrical Machines
The speed of a cumulatively compound DC motor can be controlled by varying

 Armature resistance control.
 Shunt field resistance control.
 Any of above.
 Armature voltage control.

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Electrical Machines
Methods of synchronizing of alternator may be done by

 all dark lamp method.
 one dark two bright.
 all bright lamp method.
  all of these.

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Electrical Machines
In salient pole synchronous machine, maximum power occurs at a load angle of

 Greater than 90°
 less than 90°
 90°
 0°

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MORE MCQ ON Electrical Machines

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