Electrical Machines
For a fault at the terminal of a synchronous generator, the fault current is maximum for a

 3 - phase to ground fault.
 line to line fault.
  line to ground fault.
 3 - phase fault.

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Electrical Machines
In dc machines, the field system has to be provided on stator unlike synchronous machines Where in it could be on any member, because

 commutator action is not possible otherwise
 it gives more uniform air-gap flux distribution
 dc machines are comparatively low rating machines.
 it reduces field structure iron losses

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