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Electrical Machines

Electrical Machines
In DC machine torque depends on which of the following?

 flux (φ)
 armature current (I)
 both A and B
 speed

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Electrical Machines
Which of the following generators are used in arc welding?

 series generators
 cumulative compound generators
 differential compound generators
 shunt generators

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Electrical Machines
In a transformer which of the following losses are zero?

 Copper loss
 Iron loss
 Rotational loss
All of these

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Electrical Machines
If the field of a dc shunt motor gets opened while the motor is running, then the

 motor will attain dangerously high speed
 motor will become slow.
 armature will oscillate about original speed as the mean speed
 armature current will drop

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Electrical Machines
In circle diagram for induction motor, diameter of circle represents which of the following ?

 Line voltage.
 Slip.
 Running torque.
 Rotor current.

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Electrical Machines
Universal motor have which of the following application?

  Domestic pump.
  Food mixer.
  Lift.
  Traction.

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MORE MCQ ON Electrical Machines

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