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Electrical Machines

Electrical Machines
A 10KVA auto transformer, turn ratio is 0.4. Find the power transferred inductively?

 6 KVA
 4 KVA
 10 KVA
 0 KVA

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Electrical Machines
Hysteresis loop represents the area of

 eddy current loss
 copper loss
 total iron losses
 hysteresis loss

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Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be

 230 V
 460 V
 65 V
 115 V

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Electrical Machines
The speed of rotation of 5th harmonic component in the stator of an induction motor is

 5 times the synchronous speed.
  (1 / 5) times the synchronous speed.
 (1 / 15) times the synchronous speed.
  0.5 times the synchronous speed.

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Electrical Machines
In salient pole synchronous machine, maximum power occurs at a load angle of

 Greater than 90°
 less than 90°
 90°
 0°

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Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

 20.
  0.905.
 1.1.
  0.05.

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