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Electrical Machines

Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 lagging
 zero
 unity
 leading

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Electrical Machines
When the excitation of normally operating unloaded, salient pole synchronous motor suddenly gets disconnected, it continues to run as a

 DC motor.
 induction motor.
 variable reluctance motor.
 switched reluctance motor.

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Electrical Machines
For pure resistive load what is the armature reaction?

All of these
 magnetization
 cross magnetization
 demagnetization

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Electrical Machines
Iron losses in a DC machine are independent of variation in

  voltage.
  speed and voltage.
 speed.
  load.

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Electrical Machines
Ward-Leonard control is basically a ___________ control method.

 Field control.
 Field diverter control.
 Armature voltage control.
 Armature resistance control.

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Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

 rotor of an synchronous machine.
 stator of a induction machine.
 stator of a dc machine.
 rotor of a dc machine.

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