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Electrical Machines

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

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

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Electrical Machines
What is the shunt resistance component equivalent circuit obtained by no load test of an induction motor representative of ?

 Copper loss
 both 1 and 2
 windage and friction loss
 core loss only

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Electrical Machines
Speed of DC motor can be controlled by varying

 its flux oer pole.
 applied voltage.
 resistance of armature culture.
 all of these.

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Electrical Machines
In dc machines, the space waveform of the air-gap flux distribution affects

 both the torque and voltage
 neither the voltage nor the torque
 torque but not the voltage
 voltage but not the torque

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Electrical Machines
For high current and low current rating which winding is employed to DC machine?

 Lap winding
 Both lap and wave winding
 None of above
 Wave winding

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Electrical Machines
Regenerative braking is possible in

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

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