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The chief disadvantage of a potentiometric transducer is

  • A.its inability to work with a direct voltage supply
  • B.the need for a bridge circuit to reveal the change of resistance
  • C.mechanical wear of the wiper and the track
  • D.the very small output it produces, needing a sensitive amplifier

Answer: C

A sliding contact wears, generates noise and eventually becomes unreliable, and the friction it adds loads the mechanism being measured. Its large output and simplicity are real merits, which is why it survives where a limited life is acceptable.

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