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A transducer whose output is a train of pulses whose frequency is proportional to flow is

  • A.an active transducer
  • B.a secondary transducer
  • C.a digital transducer requiring no analogue to digital conversion
  • D.an analogue transducer whose output happens to be periodic

Answer: C

A turbine meter with a magnetic pickup gives one pulse per blade, so counting pulses gives volume and their rate gives flow. Because the information is in a count rather than a magnitude, it can be fed straight into a digital system.

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