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A resolver is preferred to an optical encoder where

  • A.the environment is hot, dirty or subject to vibration
  • B.the very highest resolution is the overriding requirement
  • C.the drive is required to run in open loop
  • D.no position information is needed at all

Answer: A

Being a small rotating transformer with no optics and no electronics at the shaft, it tolerates conditions that would destroy an encoder. The signals need conversion electronics in the drive, which is where the cost sits.

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