Electrical Machines
Fufuraldehyde analysis is done to determine the

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

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Electrical Machines
A dc shunt generator, when commissioned after a major repair of the field system, failed to build Up voltage. It was because

 field winding was wrongly connected
 field system lost residual magnetism
 there was a break in the armature circuit
 field resistance was higher than critical resistance

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