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Electrical Machines

Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  make noise.
  not run.
  run normally.
  get over heated.

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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.

 0.649.
 0.512.
 0.443.
  0.573.

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Electrical Machines
A lap wound 4 pole dc motor has 460 conductors. Find the number of parallel paths between the conductors?

  2.
 6.
  data provided is insufficient.
  4.

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Electrical Machines
The armature core of a DC machine is laminated to minimise

 temperature rise
 eddy-current loss
 hysteresis loss
 mechanical loss

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Electrical Machines
If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current Iμ and Iw respectively, then

 I1 = KI2 + Iw.
 I1 = KI2 + Iμ.
  I1 = KI2 + Iw + Iμ.ok
 I1 = KI2.

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Electrical Machines
In DC machine shape of armature MMF wave is?

 Peaky in nature.
 Triangular and directed towards brush axis.
 Triangular and directed towards main pole.
 Saddle shape.

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MORE MCQ ON Electrical Machines

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