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Electrical Machines

Electrical Machines
Which of the following relation is correct?

None of these
 Xd = Xq.
 Xd > Xq.
 Xd < Xq.

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Electrical Machines
A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor

 Increases.
 Remains unchanged.
  Decreases.
 Oscillates around the rated speed.

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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?

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

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Electrical Machines
A shaded pole single phase induction motor can be used for

 personal computers as cooling fan
 tape recorders
 wet grinders
 food mixers

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Electrical Machines
In an ideal DC generator the regulation is

 high.
 positive.
 zero.
 low.

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Electrical Machines
What does happen if tripled harmonics given to induction motor?

  Nothing will happen.
  Fail to start.
  Will results in short circuit.
  Will results in open circuit.

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