Biomedical Measurements and Monitoring Techniques
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Questions and Answers

What is the main difference between direct and indirect measurements?

  • Direct measurements are always more accurate than indirect measurements.
  • Direct measurements are only used in physics experiments, while indirect measurements are used in biology experiments.
  • Direct measurements compare an unknown quantity with a standard, while indirect measurements measure something other than the actual quantity. (correct)
  • Direct measurements involve using a null type instrument, while indirect measurements do not.

    • What does a null measurement rely on to determine the measured quantity?

  • The deviation between the measured value and the true value
  • The response of the instrument
  • The connection of the measuring instrument to the system
  • The zero or null indication of the instrument (correct)

    • How is the true value of an actual value calculated?

  • By comparing the measured value to the standard value (correct)
  • By dividing the measured value by the standard value
  • By observing the deviation of the measured value from the true value
  • By adding a calibration factor to the measured value

    • Which type of measurement involves comparing the measurand to a calibrated standard directly?

    <p>Direct measurement</p> Signup and view all the answers

    What type of signals take on a finite number of different values in a given range?

    <p>Digital signals</p> Signup and view all the answers

    In a null type instrument, what does a zero or null indication lead to?

    <p>Determination of measured quantity magnitude</p> Signup and view all the answers

    What is defined as a device that converts a physical quantity into an electrical quantity?

    <p>Transducer</p> Signup and view all the answers

    How does a deflection type instrument determine the quantity under measurement?

    <p>By providing a basis through deflection</p> Signup and view all the answers

    Which type of signal processing requires considerable input before producing any results?

    <p>Delayed-time signal processing</p> Signup and view all the answers

    In the context of measurements like cell cultures, why might several days be needed before obtaining an output?

    <p>Because delayed-time modes require substantial input</p> Signup and view all the answers

    Why do most medical measurands parameters have values much lower than conventional sensing parameters?

    <p>Due to the nature of the signals being measured</p> Signup and view all the answers

    What determines the morphology of internal organs noninvasively?

    <p>X-ray shadows</p> Signup and view all the answers

    Which mode is suitable for measuring slowly changing measurands like body temperature?

    <p>Sampling mode</p> Signup and view all the answers

    In the generating mode, how do sensors produce their signal output?

    <p>By directly taking energy from the measurand</p> Signup and view all the answers

    Which type of sensor uses the measurand to alter the flow of energy from an external source?

    <p>Photoconductive cell</p> Signup and view all the answers

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