Electrical Machines
For satisfactory parallel operation of two transformers which of the following conditions is most essential,

 voltage ratio of all transformers must be same.
  polarities of all transformers must be same.
 MVA rating of all transformer inversely proportional to impedance.
 percentage impedance of all transformers must be same.

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Electrical Machines
A 10 kW, 230 V, dc shunt machine has four terminals brought out through four leads. For this machine

 both the windings have thick leads
 armature winding has thick leads whereas field winding has thin leads
 armature winding has thin leads whereas field winding has thick leads
 both the windings have thin leads

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