Electrical Machines
Consider the following statements : Interpoles in dc machines 1. reducearmature reaction effects in the interpolar region 2. have the same dimension as main polls 3. have their windings connected in series with the armature 4. have same number of turns as the armature 5. have the polarity same as that of the main pole ahead in a motor From these, the correct statements are

 1, 2 and 3
 1, 2, 3 and 5
 1 and 3
 1, 3 and 5

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Electrical Machines
In a 3 - Φ induction motor

  power factor at starting is high as compared to that while running.
  power factor at starting is low as compared to that while running.
  power factor at starting in the same as that while running.
  none of them.

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