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?

To compare the readings of two gauges (D) Signup and view all the answers

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

Send the gauges out for regular calibration (C) Signup and view all the answers

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

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

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

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

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

A constant head (or reference head) to the DP-cell. (D) 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?

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

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

To ensure that pressure imbalance will not damage the differential pressure assembly. (D) 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?

Ultrasonic flow meter (D) Signup and view all the answers

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

They do not contact the process fluid (D) Signup and view all the answers

What is the purpose of a mass flow meter?

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

What is the principle behind a Coriolis flow meter?

Vibration-induced tube movement (A) Signup and view all the answers

In which industries are Coriolis meters commonly used?

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

Which of the following is true about optical pyrometers?

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

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

To filter out infrared energy emissions (D) Signup and view all the answers

What is the main advantage of using an infrared thermometer?

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

What type of energy does an infrared thermometer detect?

Infrared energy (B) Signup and view all the answers

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

-40°C to 800°C (C) Signup and view all the answers

What is the most economical and durable type of hygrometer?

Capacitive hygrometer (D) 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?

Thermal conductivity (D) 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?

Absorption of infrared wavelengths (A) Signup and view all the answers

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

To measure and report emission data (C) Signup and view all the answers