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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

 (V2 - E2) / E2
 (E2 - V2) / V2
 (E2 - V2) / E2
 (V2 - E2) / V2

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Electrical Machines
The slip of an induction motor normally does not depend on

  rotor speed.
  synchronous speed.
  shaft torque.
  core loss component.

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Electrical Machines
Example of double excited machine is

 Both are correct.
 Synchronous motor.
 DC Shunt Motor
None of these

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Electrical Machines
Series booster is a

  series wound DC generator.
 separately excited DC generator.
 permanent magnet DC generator.
 shunt wound DC generator.

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Electrical Machines
Scott connections are used for

 single phase to three phase transformation.
 three phase to two phase transformation.
 any of the above.
 three phase to single phase transformation.

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Electrical Machines
A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is

 768 V
 384 V
 96 V
 192 V

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