Electrical Machines
What is/are the necessary conditions for voltage build up in self excited generator?

All of these
 Field winding should be properly connected to armature winding.
 Field winding resistance should be less than critical resistance.
 Poles should contain residual flux.

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Electrical Machines
For an ideal transformer the winding should have

 equal resistance on primary and secondary side
 minimum resistance on primary side and maximum resistance on secondary side
 maximum resistance on primary side and least resistance on secondary side
 no ohmic resistance on either side

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