4AE3 U9 C2 Test M 25

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Questions and Answers

Which of the following is a practical means of restricting pulsations in the line leading to a pressure gauge?

  • Using a needle valve (correct)
  • Compressing the rubber bulb
  • Using a dead weight tester
  • Using a hydraulic comparator

Which of the following methods is used to check the accuracy of pressure gauges over their entire measuring range?

  • Connecting an accurate test gauge
  • Test gauge comparison
  • Hydraulic comparator
  • Dead weight tester (correct)

What is the purpose of a dead weight tester?

  • To check the accuracy of pressure gauges (correct)
  • To compress the rubber bulb
  • To compare the readings of two gauges
  • To restrict pulsations in the line

What is the purpose of a hydraulic comparator?

<p>To compare the readings of two gauges (D)</p> Signup and view all the answers

What is the recommended action for smaller plants that do not have dead weight testers or hydraulic comparators?

<p>Send the gauges out for regular calibration (C)</p> Signup and view all the answers

Which of the following is true about the pressure gauge in a remote water-level indicator?

<p>The pressure gauge is directly calibrated in liquid depth. (A)</p> Signup and view all the answers

What is the purpose of the condensing pot in a remote water-level indicator?

<p>To maintain a fixed head of water or pressure on the upper side of the diaphragm. (C)</p> Signup and view all the answers

In a differential pressure level measurement, what does the "High Side Transmitter Connection" provide?

<p>A constant head (or reference head) to the DP-cell. (D)</p> Signup and view all the answers

What is the purpose of leaving one port of the DP-cell open to the atmosphere in an open tank level measurement?

<p>To accurately detect and measure the liquid level as function of the hydrostatic head. (C)</p> Signup and view all the answers

What is the purpose of the equalizer pipe in a remote water-level indicator?

<p>To ensure that pressure imbalance will not damage the differential pressure assembly. (D)</p> Signup and view all the answers

Which type of flow meter is well suited for measuring the flow of gases, clear liquids, and liquids containing sound reflecting particles?

<p>Ultrasonic flow meter (D)</p> Signup and view all the answers

What is the advantage of using ultrasonic transducers attached to the outside of a pipe?

<p>They do not contact the process fluid (D)</p> Signup and view all the answers

What is the purpose of a mass flow meter?

<p>To measure the mass flow rate of a fluid (D)</p> Signup and view all the answers

What is the principle behind a Coriolis flow meter?

<p>Vibration-induced tube movement (A)</p> Signup and view all the answers

In which industries are Coriolis meters commonly used?

<p>Petro-chemical, food and beverage, pulp and paper, pharmaceutical (A)</p> Signup and view all the answers

Which of the following is true about optical pyrometers?

<p>They use a narrow band of radiation wavelengths to measure temperature (A)</p> Signup and view all the answers

What is the purpose of the red optical filter in an optical pyrometer?

<p>To filter out infrared energy emissions (D)</p> Signup and view all the answers

What is the main advantage of using an infrared thermometer?

<p>They can measure temperatures of less accessible objects from a distance (C)</p> Signup and view all the answers

What type of energy does an infrared thermometer detect?

<p>Infrared energy (B)</p> Signup and view all the answers

What is the temperature range in which an infrared thermometer can work?

<p>-40°C to 800°C (C)</p> Signup and view all the answers

What is the most economical and durable type of hygrometer?

<p>Capacitive hygrometer (D)</p> Signup and view all the answers

Which type of detector is commonly used in gas chromatographs to measure the quantity of a particular gas component in a mixture?

<p>Thermal conductivity (D)</p> Signup and view all the answers

What is the principle behind non-dispersive infrared (NDIR) detectors used to measure carbon monoxide (CO) and carbon dioxide (CO2) in gas chromatographs?

<p>Absorption of infrared wavelengths (A)</p> Signup and view all the answers

What is the purpose of continuous emission monitoring systems (CEMS) in industrial facilities?

<p>To measure and report emission data (C)</p> Signup and view all the answers

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