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Electrical Machines

Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 25 W.
 28 W.
 36 W.
 30 W.

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Electrical Machines
In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation.

 synchronizing power co efficient.
  restoring torque.
 damping torque.
 mechanical rotatory system.

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Electrical Machines
The field system of an alternator is usually excited

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

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Electrical Machines
In a transformer which of the following losses are zero?

 Iron loss
All of these
 Rotational loss
 Copper loss

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Electrical Machines
Silicon content in steel lamination is kept within 5% as it

All of these
 makes the material brittle.
 Increases cost.
 increases hysteresis loss.

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Electrical Machines
The current drawn by the a 230 V DC motor of armature resistance 0.5 Ω and back emf 200 V is

 660
 600
 60
 40

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