Electrical Machines
If dimension of all the parts of a synchorous generator and the number of field and armature turns are double, then generated voltage will change by a factor of

 1.
  8.
 2.
 4.

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Electrical Machines
For a given torque, reducing divertor resistance of a DC series motor

  Increase in speed but armature currnet remains the same.
  Decrease in speed demanding less armature current.
  Decrease in speed but armature current remains the same.
  Increase in speed demanding more armature current.

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Electrical Machines
In a dc generator operating on load with its brushes on the geometrical neutral axis (GNA), the magnetic neutral axis (MNA) is shifted in the direction of rotation. Now, if the brushes are given a lead of 90° (electrical), then the MNA will

 shift forward by more than 90°
 shift forward by less than 90°
 shift forward by 90°
 coincide with the GNA

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