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Electrical Machines

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

 any of the above
 full load
 no load
 half load

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Electrical Machines
Centrifugal switch is absent in which of the single phase induction motor?

  PSC (permanent split capacitor) motor.
 Split phase motor.
None of these
 Shaded pole motor.

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Electrical Machines
A 3- phase synchronous motor can operate over a wide range of power factors i.e. from lagging to leading power factor. This is achieved by

 changing the field excitation.
 changing the load.
 varying the speed.
 varying the applied voltage.

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Electrical Machines
Which of following DC generator will be in a position to build up without any residual magnetism in the field?

  Separately excited.
 Shunt.
  Series.
  Compound.

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Electrical Machines
The speed of a cumulatively compound DC motor can be controlled by varying

 Armature resistance control.
 Shunt field resistance control.
 Any of above.
 Armature voltage control.

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Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 18°
 30°
 72°
 36°

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