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Electrical Machines

Electrical Machines
Swinburne test is conducted under which of the following condition?

 any of the above
 no load
 full load
 half load

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Electrical Machines
The armature core of the rotor bars of dc motors are laminated

  to reduce mechanical losses.
  to reduce hysteresis loss.
  to provide better flux linkage.
  to reduce eddy current loss.

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Electrical Machines
Hysteresis loss will depends on

 f
 f²
 f1.6
 f³

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM is running at a full load speed of 980 rpm. If it delivers an air gap power of 98000 Watt, calculate the rotor ohmic loss?

  1960 Watt.
 1920 Watt.
 1800 Watt.
  980 Watt.

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Electrical Machines
The shaft of induction motor may be unbalanced due to

  overload.
  overheating of winding.
  uneven air gap.
  poor lubrication.

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Electrical Machines
A 2 KVA transformer has iron loss of 150 W and full load copper loss of 250 W. The maximum efficiency of the transformer would occur when the total loss is

 300 W
 500 W
 400W
 250 W

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