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Electrical Machines

Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmin to Imin
 Vmax to Imin
 Vmin to Imax
 Vmax to Imax

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Electrical Machines
Which of the following motors has negative speed regulation?

 Both B and C.
 Series motors.
 Shunt motors.
 Differential compound motors.

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Electrical Machines
If any two leads from slip rings are interchanged in a 3 - Φ induction motor, the motor will

  run in a direction opposite to previous one.
  continue running in the same direction as before.
  not run.
  get damaged.

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Electrical Machines
Commutator in DC generator is used for

 collecting of current
 convert AC armature current in to DC
 reduce losses
 increase efficiency

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms is connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 460 A.
 570 A.
 250 A.
 340 A.

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Electrical Machines
If the back emf in DC motor vanishes suddenly the motor will

 run at very low speed.
 run at very high speed.
 burn.
 start haunting.

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MORE MCQ ON Electrical Machines

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