Electrical Machines
The armature of DC machine is made of silicon steel lamination to

 reduce eddy current loss only.
 increase the permeability.
 reduce hysteresis loss only.
 reduce both eddy current and hysteresis loss.

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Electrical Machines
In a loaded DC generator, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

 deteriorate with fall of terminal voltage.
 deteriorate with rise in terminal voltage.
 improve with fall of terminal voltage.
 improve with rise in terminal voltage.

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