Ultrasonic Transducer Applications

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Questions and Answers

What happens to the output signal of a linear output Hall Effect sensor as the strength of the magnetic field increases?

  • It becomes erratic
  • It decreases until it saturates
  • It increases until it saturates (correct)
  • It remains constant

In what applications are Hall-effect sensors commonly used?

  • Industrial process control
  • Automobiles
  • Telecommunication
  • All of the above (correct)

How are Hall-effect sensors used in position sensing?

  • To sense sliding motion (correct)
  • To monitor vibration
  • To detect temperature changes
  • To measure liquid level

What is one of the applications of Hall-effect sensors as mentioned in the text?

<p>Capacitive proximity switches (C)</p> Signup and view all the answers

Which type of sensor is commonly used for measuring flow according to the text?

<p>Hall-effect current sensor (C)</p> Signup and view all the answers

How does the output of a linear output Hall Effect sensor behave once it begins to saturate?

<p>It remains stable (D)</p> Signup and view all the answers

What is the term used to describe the distance from the face of the ultrasonic transducer that is blind and cannot detect an object?

<p>Blanking zone (A)</p> Signup and view all the answers

Why should the hopper, bin, or tank be relatively free of obstacles for ultrasonic level sensors?

<p>To minimize false returns and erroneous responses (A)</p> Signup and view all the answers

Which type of level sensor excels in sensing the presence of solids, liquids, and slurries?

<p>Capacitance level sensor (A)</p> Signup and view all the answers

What is the term used to describe the period of mechanical vibration experienced by ultrasonic transducers known as?

<p>Ringing period (A)</p> Signup and view all the answers

What can electronic signal processing circuitry do to make ultrasonic sensors intelligent devices?

<p>Provide point level control and continuous monitoring (B)</p> Signup and view all the answers

Which of the following is a common application of capacitance level sensors?

<p>Sensing presence of solids, liquids, and slurries (D)</p> Signup and view all the answers

What is the primary method used by accelerometers to measure vibration?

<p>Piezoelectric effect (D)</p> Signup and view all the answers

In what kind of machinery are proximity sensors commonly used to measure vibration?

<p>Rotating machinery (C)</p> Signup and view all the answers

Why are proximity sensors preferred over accelerometers for measuring shaft motion in certain machinery?

<p>Vibrations do not transmit well to the outer casing (B)</p> Signup and view all the answers

What kind of flow sensor uses ultrasound to analyze the volume of liquid flow?

<p>Ultrasonic flow sensor (B)</p> Signup and view all the answers

In which type of applications are ultrasonic flow sensors suitable?

<p>Wastewater applications (A)</p> Signup and view all the answers

Why do ultrasonic flow sensors require bubbles or minute particles within the liquid flow?

<p>To provide a reflective surface for ultrasound waves (D)</p> Signup and view all the answers

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