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Electrical Machines

Electrical Machines
Hopkinss test in DC motor is conducted at ?

 Low load.
  Full load.
 No load.
 None of these.

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Electrical Machines
When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop

  DC motor torque.
  synchronous motor torque.
  induction motor torque.
  induction generator torque.

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Electrical Machines
The oscillation in a synchronous motor can be damped out by

  providing damper bars in the rotor pole faces.
  oscillation cannot be damped.
  running the motor on leading power factors.
  maintaining constant excitation.

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Electrical Machines
In DC machine yoke offers

 flux path completion
 mechanical protection to the machine
 produce working flux
 both A and B

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Electrical Machines
In shunt dc motor the direction of rotation of the motor will reversed. When

  either field terminals are reversed or armature terminals are reversed.
  none of above.
  only field terminals are changed.
  only armature terminals are reversed.

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Electrical Machines
In Ward-Leonard method of speed control, the direction of rotation of motor is reversed usually reversing the connection of the

 motor field terminal.
 generator field terminal.
 motor armature terminal.
 generator armature terminal.

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MORE MCQ ON Electrical Machines

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