Electrical Machines
The field system of an alternator is usually excited

  110 / 220 V AC.
  230 V AC.
  250 / 250 V DC.
  3 - Φ, 50 Hz and 400 V.

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Electrical Machines
With the increase in speed of DC motor

  Back emf increase but line current falls.
 Both back emf as well as line current increase.
 Back emf falls and line current increase.
 Both back emf as well as line current fall.

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