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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

 (V2 - E2) / V2
 (V2 - E2) / E2
 (E2 - V2) / V2
 (E2 - V2) / E2

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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
 √(Pi/Pc)
 Pc/Pi
 (Pi/Pc)2

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Electrical Machines
The output voltage of a DC generator is

 E = V + Ra.
 E = V – IaRa.
 E = V + Ia.
  E = V + IaRa.

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Electrical Machines
A generator may loose residual magnetism due to

  vibrations.
  over excitation.
  heating.
  any of these.

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Electrical Machines
A DC series motor must started on no load because it would

 Fail to start without load.
  Run at dangerously high speed.
 Not develop starting torque.
 Draw more current without producing sufficient torque.

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Electrical Machines
In a transformer, hysteresis and eddy current losses depend upon

 both 2 and 3
 supply frequency
 maximum flux density
 load current

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