Electrical Machines
CRGO steel is used in the core of transformer to reduce

 eddy current loss.
 both eddy current and hysteresis loss.
  hysteresis loss.
 ohmic loss.

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Electrical Machines
The residual magnetism of a self-excited dc generator is lost. To build up its emf again

 field winding must be excited by low voltage dc supply
 the field winding must be replaced
 the field winding connection must be reversed
 the armature connection must be reversed

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