Top 13 Automation Engineer Interview Questions & Answers (Part 2 of 2)

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With this video, we will continue with where our previous video, What are the leading Industrial Automation Job types? (https://realpars.com/automation-job/), closed with beginning the discussion on Automation Job Interview questions.

So now that we have learned about the Automation Job types let’s move on to learn more about some of the questions you’ll be asked during an interview.

The job description and degree of responsibilities vary and so you should align your capabilities with the experience required. What type of job interview questions will you be asked?

Question 1. What are the five IEC1131 programming languages?
Answer: Instruction List, Structured Text, Ladder Diagram, Function Block and Sequential Function Chart.

Question 2. Explain PID Based Control System?
Answer: PID or Proportional Integral Derivative is widely used in closed-loop control.
PID controllers maintain the output to a device so that there is zero error between process variable input and setpoint to the device.

Question 3. Please explain the difference between a PLC and DCS?
Answer: a PLC is a ruggedized computer used for automating processes.
A DCS is similar to a PLC in that it has rugged computer controllers however the DCS contains multiple autonomous controllers that are distributed throughout a system, also used for automating processes.

Question 4. What Is Encoder?
Answer: An encoder is a rotary device that outputs digital pulses which from angular motion. The encoder consists of a wheel with alternating clear stripes detected by optical sensors to produce the digital outputs.

Question 5. What Are the different components used in automation?
Answer: The components of the automation system include sensors for sensing temperature, pressure, flow, level and etc.,

Question 6. Who are the leading PLC providers?
Answer: Leading PLC providers include Rockwell Automation Allen Bradley, Siemens, Schneider Modicon, and GE Fanuc.

Question 7. Who are the leading DCS providers?
Answer: The leading DCS providers include Yokogawa, Honeywell, Fisher-Rosemount, ABB, Moore, and Foxboro.

Question 8. Who are the leading SCADA software companies?
Answer: Leading SCADA software companies are Aveva Wonderware, GE Cimplicity, GE iFix, Siemens WinCC, Iconics Genesis64, Inductive Automation Ignition, Rockwell Software FactoryTalk View.

Question 9. What types of sensors are used for measuring?
Answer: Temperature, Pressure, Flow, Level, Conductivity, Density, Ph type sensors.

Question 10. What is transmitter?
Answer: A transmitter is an electronic device mounted in the field or plant close to a sensor.
The sensor transduces a measured physical variable like temperature and then outputs a low electronic signal to a controller.

Question 11. Why is 4-20 mA preferred over 0-10 V Signal?
Answer: The 0-10 V signal has the tendency to weaken over a long distance because of resistance.
The 4-20 mA can travel a long distance without dropping signal value.

Question 12. Why is 4-20 mA preferred over 0-20 mA signal?
Answer: With 0-20 mA you cannot easily determine between minimum field value and a wire break. With the 4-20 mA, a wire break can be determined.

Question 13. Difference between 2-wire, 3-wire, and 4-wire transmitters?
Answer: For a 2-wire transmitter the power and signal are transmitted through the same cable. For a 3-wire transmitter, the data signal and power are with respect to common ground and for a 4-wire transmitter two of the wires are used for power and two wires are used for signals.

Be ready to answer a few more questions, for example;

- Have you lead any projects, please explain how you were successful?

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What are the leading Industrial Automation Job types? (Part 1 of 2)
https://realpars.com/automation-job/

How to prepare for the job interview questions as an Automation Engineer (Part 2 of 2)
https://realpars.com/interview-questions

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