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Electrical Machines

Electrical Machines
Equalizer rings are used in which of the followings?

 lap winding
None of these
 wave winding
 both 1 and 2

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Electrical Machines
The dc motor which can provide zero speed regulation at full load without any controller, is

 shunt.
 differential compound.
 series.
 cumulative compound.

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Electrical Machines
Armature of DC machine is made of

 insulating material.
 non-ferrous material.
 silicon steel.
 conducting material.

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Electrical Machines
Breather is provided in a transformer to

 absorb moisture from air entering in transformer.
 provide cold air in transformer.
  absorb moisture of air during breathing.
 filter the transformer oil.

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Electrical Machines
Commutator pitches of duplex and simplex lap windings are respectively

 4 and 2
 2 and 1
 2 and 2
 4 ang 1

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Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 230 V
 200 V
 115 V
 460 V

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