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Electrical Machines

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

 wave winding
 both 1 and 2
 lap winding
None of these

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Electrical Machines
If the excitation is increased, the power factor is

 leading power factor
 unity power factor
None of these
 lagging power factor

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Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 0o.
 180o.
 dependent upon the load.
 90o.

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Electrical Machines
The commutator segments of DC machines are made up of

 hard-drawn copper
 brass
 copper
 copper alloy

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Electrical Machines
The DC compound motors are generally

 Differentical compound.
 None of these.
 Level Compound.
 Cummulative compound.

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Electrical Machines
The short circuit test on a transformer is conducted to obtain

 core loses only.
  copper losses.
 eddy current loss.
 hysteresis loss.

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