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An active transducer is one that

  • A.responds to a change in the quantity rather than to its absolute value
  • B.generates its own output without an external supply
  • C.requires an external supply to produce an output signal
  • D.contains an amplifier within the same housing as the sensing element

Answer: B

A thermocouple, a piezoelectric crystal and a photovoltaic cell all deliver an electrical output from the energy of the quantity being measured. A passive transducer such as a strain gauge merely changes an electrical property and needs a supply to reveal the change.

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