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Comparing sacrificial anode protection with impressed current protection, the sacrificial method

  • A.needs a power supply but consumes no anodes
  • B.protects a longer structure from a single installation
  • C.allows the protective current to be adjusted at will
  • D.needs no power supply but consumes its anodes

Answer: D

Its simplicity suits a hull or a small buried tank, while the anodes must be renewed and the current cannot be varied. An impressed current system covers long pipelines and lets the current be tuned, at the cost of a rectifier and a supply.

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