Electrical Machines
If Pi and Pc represent core and full load copper loss respectively, the maximum KVA delivered to load corresponding to maximum efficiency is equal to rated KVA is

 √(Pi/Pc)
 Pc/Pi
 (Pi/Pc)2
 Pi/Pc

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Electrical Machines
In a 3 - Φ induction motor

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

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