Electrical Machines
The no load and full load speed of DC mototr are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor?

  16.67%.
 18.25%.
 14.28%.
 15.30%.

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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

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

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