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Electrical Machines

Electrical Machines
In DC motors, under trailing pole tips, flux density will_______ ?

 increase
 either increase or decrease
None of these
 decrease

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Electrical Machines
In a synchronous motor hunting can be reduced to minimum possible by

  providing damper winding in the rotor pole faces.
  designing the motor for adequate synchronizing power.
  any of above methods.
  using a flywheel.

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Electrical Machines
Example of double excited machine is

 Both are correct.
 DC Shunt Motor
 Synchronous motor.
None of these

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Electrical Machines
Sparkless commutation can be achieved by employing

  inter poles.
  high resistance carbon brushes.
 compensating winding.
  any one or more of the above methods.

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Electrical Machines
A 3 - Φ slip ring motor has

  wound rotor.
  double cage rotor.
  short-circuited rotor.
  any of the above.

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Electrical Machines
In induction motor wound rotor motor is mainly is used in application where

  less costly motor is not required.
 power factor is less.
  low starting torque.
  high starting torque.

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