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A potentiometric position sensor has the disadvantage that

  • A.It requires no excitation
  • B.It cannot measure absolute position
  • C.Its output is not proportional to position
  • D.Its wiper contact wears and can become noisy

Answer: D

The sliding contact is a wearing part and dirt or wear produces intermittent readings. Its simplicity and low cost keep it in use where the travel is infrequent and the life requirement modest. Cost and simplicity keep it in service.

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