Electrical Machines
A series motor is efficiently suitable for

 constant speed operation.
 none of these.
 low starting torque operation.
  high starting torque operation.

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Electrical Machines
In a loaded DC generator, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

 improve with fall of terminal voltage.
 deteriorate with fall of terminal voltage.
 deteriorate with rise in terminal voltage.
 improve with rise in terminal voltage.

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