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Which of the following is a passive transducer?

  • A.a piezoelectric accelerometer
  • B.a photovoltaic cell
  • C.a strain gauge
  • D.a thermocouple

Answer: C

A strain gauge changes its resistance and nothing more; a bridge and a supply are needed before any signal appears. The other three are self-generating and therefore active, which is the standard division of transducers.

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