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A primary transducer is distinguished from a secondary one in that it

  • A.produces the larger of the two output signals in a measuring chain
  • B.requires no external supply of any kind for its operation
  • C.is placed nearer to the indicating instrument in the chain
  • D.responds directly to the quantity being measured

Answer: D

In a Bourdon tube fitted with an LVDT, the tube is the primary element converting pressure into displacement and the LVDT is the secondary converting displacement into voltage. Many measurements involve such a chain of two conversions.

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