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Electrical Machines

Electrical Machines
Which of the following is not a part of transformer?

  Commutator.
 Tap changer.
 Radiator.
 Conservator tank.

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Electrical Machines
Scott connections are used for

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

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Electrical Machines
Iron loss in a transformer mainly occurs in

 iron made tank of transformer.
 winding of transformer.
 transformer insulating oil.
 steel core in transformer.

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Electrical Machines
Which of the following methods are used to control the speed of DC motors is

 armature circuit resistance control
All of these
 field current control
 supply voltage control

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Electrical Machines
In a synchronous motor electromagnetic power varies

None of these
 directly as square of applied voltage
 directly as applied voltage
 inversely as applied voltage

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Electrical Machines
In DC generators, the cause of rapid brush wear may be

 any of above.
 imperfect contact.
 rough commutator surface.
 severe sparking.

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