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Electrical Machines

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

 lagging
 unity
 zero
 leading

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Electrical Machines
In dc machine armature windings are placed on rotor because of the necessity for

 electromechanical energy conversion.
 development of torque.
 commutation.
 generation of voltage.

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Electrical Machines
In travelling cranes for crane travel, trolley and boom hoist which motor is preferred?

  Synchronous motor.
  Stepper motor.
  Slip ring induction motor.
  DC differential compound motor.

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Electrical Machines
The torque developed in IM is nearly proportional to

  V2.
  1 / V.
 1 / V2.
  V.

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Electrical Machines
Field weakening control method is used for the _________ ?

 above rated speed
None of these
 both A and B
 below rated speed

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Electrical Machines
In case of DC Shunt Motor, the speed will____ if the voltage increases, neglecting armature saturation.

 increase
 remain the same.
 decrease.
 be unpredictable.

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