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Electrical Machines

Electrical Machines
The wound rotor type IM is used for____________ speed operation.

  variable.
  maximum.
  minimum.
  constant.

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Electrical Machines
Unbalance 3 - Φ stator currents cause

  heating of rotor.
  vibrations.
All of these
  double frequency currents in the rotor.

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Electrical Machines
Hunting in a synchronous motor takes place

  motor is under loaded.
  when power factor is unity.
  when supply voltage fluctuates.
  when load varies.

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Electrical Machines
Ideal value of voltage regulation of a device is?

 a finite negative value
 a positive finite value
 ∞
 0

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Electrical Machines
Consider the following statements : 1. interpole windings are connected in series with armature windings 2. polarity of interpoles must be the same as that of the main poles in advance 3. distortion of the main field under the pole shoes is not affected by the use of interpoles From above, the correct answer is

 2 and 3
 1 alone
 1 and 3
 1 and 2

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Electrical Machines
Under operating conditions the rotor conductor should be _________________ in induction motor.

  semi closed or semi opened.
  always closed.
  none.
  always opened.

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MORE MCQ ON Electrical Machines

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