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

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

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Electrical Machines
A dc shunt generator, when commissioned after a major repair of the field system, failed to build Up voltage. It was because

 field system lost residual magnetism
 field winding was wrongly connected
 there was a break in the armature circuit
 field resistance was higher than critical resistance

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