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Electrical Machines

Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

  270.
 180.
 30.
 45.

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Electrical Machines
The main purpose of providing tertiary winding in a three phase transformer is

 to interconnect three voltage systems.
  to suppress harmonic and unbalance in voltage.
 to carry extra load.
None of these

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Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to

 f2
 f
 V2
 V

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Electrical Machines
In a synchronous motor, damper windings are provided on

  rotor shaft.
None of these
  stator frame.
  pole faces.

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Electrical Machines
What is the full form of MNP?

  Magnetic neutral plane.
  Magnetic neutral pole.
  Magnetic field neutral pole.
  Magnetic field neutral plane.

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Electrical Machines
In applied voltage is reduced in a dc shunt motor

 Full load torque.
 None of these.
 Full load speed.
  Full load current.

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