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Electrical Machines

Electrical Machines
Hysteresis loss will depends on

 f³
 f²
 f
 f1.6

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Electrical Machines
In above question, find rms line voltage for delta connection?

  230.2 V.
 50 V.
 399 V.
 100 V.

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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.
 30 W.
 36 W.

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

 474 V
 234 V
 6 V
 240 V

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Electrical Machines
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of

  permanent magnets.
None of these
  residual magnetism.
 armature reaction.

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Electrical Machines
Stability of a synchronous motor ---------- with the increase in excitation.

 any of the above
 remains unaffected
 increases
 decreases

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