Electrical Machines
Series generators are used in which of the following applications?

 Used as boosters in dc distribution or transmission.
 Air crafts.
 Arc welding.
All of these

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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 reduces field structure iron losses
 it gives more uniform air-gap flux distribution
 dc machines are comparatively low rating machines.

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