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

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

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
If two 8-pole dc machines of identical armature sare wound, one with lap winding and the other with wave winding, then

 wave-wound machine will have more rated voltage and less current
 lap-wound machine will have more rated voltage and more current
 wave-wound machine will have more rated current and more voltage
 lap-wound machine will have more rated voltage and less current

ANSWER DOWNLOAD EXAMIANS APP