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Electrical Machines

Electrical Machines
In alternator, the rotary part is

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

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Electrical Machines
Star - delta method of starting of motor is not possible in case of

  high speed motor.
  high torque motor.
  low horse power motor.
  single phase induction motor.

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Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

  0.573.
 0.443.
 0.649.
 0.512.

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Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

 1
 2
 3 or 4
 0

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

  Universal.
  Repulsion.
  Split phase.
  Capacitor run.

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Electrical Machines
In induction motor especially the cage rotors slots are nearly parallel to shaft axis. This is called

  skewing.
  slip.
  crawling.
  cogging.

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MORE MCQ ON Electrical Machines

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