Instrumentation Controls Technician Interview Mock Questions with
correct answers 100%guaranteed pass
1 .Difference between 4-20mA signal and a 0-10v signal?: Both are analog signals. 4-20mA is
preferred because it has a live zero that can be referenced against a true zero. Its also less susceptible to electrical noise.
0-10v is easier to implement but more prone to interference and voltage drop. Typically used for short runs.
1. Describe the process you take to calibrate an instrument.: -Gather tools and materials
needed.
-Gather documentation.
-Inspect instrument for damage, loose connections, or other issues.
-Follow manufacturer's or company guidelines for calibration process.
-Documentation once calibration is complete.
-Verify calibration was correct.
2. Describe calibration procedure.: Follow the company's or manufacturer's calibration procedures. I then
compare the instrument's output against a known reference standard. I then will adjust input values and record the output
values. Once complete, I will adjust the zero and span screws and repeat the process. I will stop once the instrument is within
tolerance.
3. What safety precautions do you take when working with equipment?: -Wear
appropriate PPE.
-Lockout/Tagout.
-Verify power is ott using a multi-meter.
-Communicate with team members.
4. What is HART communication?: Its a communication protocol that allows transmission of analog and
digital signals between field devices and control systems. Allows users to access diagnostic information from field devices and
configure information.
5. What are common issues that occur with pressure transmitters?: -They can drift
1/5
, overtime from the original calibration due to temperature, vibration, or aging components.
-Small orifices can become clogged and lead to inaccurate readings.
6. Explain what loop checking is.: The process of checking that a loop functions correctly. The means verifying
the proper function of all sensors, transmitters, controllers, and final control elements such as valves or actuators.
2/5
correct answers 100%guaranteed pass
1 .Difference between 4-20mA signal and a 0-10v signal?: Both are analog signals. 4-20mA is
preferred because it has a live zero that can be referenced against a true zero. Its also less susceptible to electrical noise.
0-10v is easier to implement but more prone to interference and voltage drop. Typically used for short runs.
1. Describe the process you take to calibrate an instrument.: -Gather tools and materials
needed.
-Gather documentation.
-Inspect instrument for damage, loose connections, or other issues.
-Follow manufacturer's or company guidelines for calibration process.
-Documentation once calibration is complete.
-Verify calibration was correct.
2. Describe calibration procedure.: Follow the company's or manufacturer's calibration procedures. I then
compare the instrument's output against a known reference standard. I then will adjust input values and record the output
values. Once complete, I will adjust the zero and span screws and repeat the process. I will stop once the instrument is within
tolerance.
3. What safety precautions do you take when working with equipment?: -Wear
appropriate PPE.
-Lockout/Tagout.
-Verify power is ott using a multi-meter.
-Communicate with team members.
4. What is HART communication?: Its a communication protocol that allows transmission of analog and
digital signals between field devices and control systems. Allows users to access diagnostic information from field devices and
configure information.
5. What are common issues that occur with pressure transmitters?: -They can drift
1/5
, overtime from the original calibration due to temperature, vibration, or aging components.
-Small orifices can become clogged and lead to inaccurate readings.
6. Explain what loop checking is.: The process of checking that a loop functions correctly. The means verifying
the proper function of all sensors, transmitters, controllers, and final control elements such as valves or actuators.
2/5
