Electrical Machines
A 4 pole DC generator rotates at 1500 rpm. How many times in a second, will the emf induced in each armature conductor changes its direction?

 500.
 750.
 200.
  100.

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Electrical Machines
In large sized DC machines the compensating windings are provided to

  neutralize voltage induced in coil due to fluctuation of l
None of these
 compensate for the decrease in speed due to increase of load.
 reduce eddy current losses by providing local short circuits.

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