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Electrical Machines

Electrical Machines
The starting resistance of DC motor is generally

 1000 ohms.
 Infinitely large.
 around 500 ohms.
  Low.

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Electrical Machines
In alternator, the rotary part is

  magnetic field poles.
 none of these.
 armature.
 core.

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Electrical Machines
Which single phase motor is used for a refrigerator?

  Split phase.
  Repulsion.
  Universal.
  Capacitor run.

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Electrical Machines
Which of the following pairs is/are correct?

All of these
 closed slot----- leakage flux is high
 open slot----- leakage flux is less
 semi closed slot-----leakage flux is moderate

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Electrical Machines
In a loaded DC motor, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

 deteriorate and the speed rises.
 deteriorate and the speed falls.
 improve and the speed falls.
 improve and the speed rises.

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

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

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MORE MCQ ON Electrical Machines

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