Electrical Machines
A 4 pole lap wound dc generator has 4 brushes, if one of the brush is damaged, what will be the change in V, I and P ratings

 V, I and P
 V/2, I and P/2
 V/2, I/2 and P/4
 V, I/2 and P/2

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Electrical Machines
DC Motor

  dc compound motor.
  dc shunt with armature resistance control.
  dc series motor.
  dc shunt motor with field weakening.

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