Electrical Machines
Fufuraldehyde analysis is done to determine the

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

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Electrical Machines
If the applied voltage of a certain transformer is increased by 50% and the frequency is reduced by 50%, the maximum flux density will (assuming that the magnetic circuit remains unsaturated)

 changes to 1.5 times the original value
 changes to 0.5 times the original value
 changes to three times the original value
 remain the same as the original

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