Electrical Machines
Fufuraldehyde analysis is done to determine the

 condition of lamination on CRGO steel sheet.
 condition of oil in transformer.
 condition of cork gaskets used in transformer.
  condition of paper insulation in transformer.

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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

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

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