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

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Electrical Machines
The synchronous motor can be started by

  coupling it with a DC compound motor.
  any of the above methods.
  providing damper winding in its rotor circuit.
  coupling it with a small AC induction motor called the pony motor.

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