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Electrical Machines

Electrical Machines
Swinburne test is conducted under which of the following condition?

 no load
 half load
 full load
 any of the above

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Electrical Machines
In a synchronous motor hunting can be reduced to minimum possible by

  designing the motor for adequate synchronizing power.
  any of above methods.
  providing damper winding in the rotor pole faces.
  using a flywheel.

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Electrical Machines
Which of the following voltage regulation method is accurate ?

 American standard association method
 MMf method
 ZPF method
 Synchronous impedance method

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Electrical Machines
DC generator will not build up voltage

 any one of above.
 if field resistance is more than critical resistance.
  if it has lost residual magnetism.
 due to wrong direction of rotation.

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Electrical Machines
For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?

 Increases.
 Decreases.
 Remain unchanged
 None of above.

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Electrical Machines
The wattage rating of a ceiling fan motor will be

  50 - 150 W.
 10 - 20 W.
 250 - 500 W.
 200 - 250 W.

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