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Transformer oil serves as

  • A.a coolant only
  • B.a lubricant for the tap changing mechanism
  • C.both an insulant and a coolant
  • D.an insulant only

Answer: C

Its dielectric strength lets the windings be spaced closely, and its circulation carries heat from the core and coils to the radiators. Moisture and particles degrade both functions, which is why oil is tested periodically.

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