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Electrical Machines

Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 460 V
 200 V
 115 V
 230 V

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Electrical Machines
No load test on induction motor is conducted to find which of the following losses?

 Stator copper loss
 Stator core loss
 Rotational loss
All of these

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 400 A.
 440 A.
 44 A.
 40 A.

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Electrical Machines
The air gap between stator and the rotor of the 3 - φ induction motor is kept

  air gap does not matter.
  as small as possible.
  as wide as possible.
  depends on the material of stator and the rotor.

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Electrical Machines
1 KVA, 230 V, 50 Hz, single phase transformer has an eddy current loss of 30 watts. The eddy current loss when the transformer is excited by a dc source of same voltage will be

 30 W
 zero watt
 more than 30 W
 less than 30 W

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Electrical Machines
In a three phase star - delta transformer, what is the angle difference between primary and secondary phase voltages?

 Delta side leads by 30°.
  Delta side lags by -30°.
 Star side lags by -30°.
 Star side leads by 30°.

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