Controls and PLC engineer interview questions: 17 to prepare for
Each question says why it is likely to come up, from what today’s 347 open controls and PLC engineer postings ask for, and what a good answer shows. Prepare a real example for each, then practise it with the interview answer builder.
Updated Nov 15, 2026, from that day’s open postings.
Practise out loudThe page reads each question aloud and checks your answer. This site keeps nothing.
- Questions to prepare
- 17
- Open controls and PLC engineer jobs today
- 347
- Postings read in full
- 50
- Median advertised pay
- $164K
Questions about the skills controls and PLC engineer postings name
Walk me through a recent project where you used SQL. What did you do yourself?
11% of today’s 347 open controls and PLC engineer postings name SQL.
A good answer shows: Your own hands-on part, the choices you made and a number for the result.
Sample answer: “In my last role I designed a housing that cut assembly time from 14 minutes to 9. I did that part myself: I chose how to do it, checked the result and explained it to the team.” Then say what you would do differently.
Technical controls and PLC engineer interview questions and answers
What does len([4, 8, 15]) return?
A Python question (26% of today’s postings name Python). More in the Python skill test.
Answer: 3. len counts the items in a list: there are three.
Which of these is a dictionary?
A Python question (26% of today’s postings name Python). More in the Python skill test.
Answer: {"a": 1, "b": 2}. A dictionary stores pairs of a key and a value, written with curly brackets and colons. {1, 2, 3} is a set.
What is the difference between a list and a tuple?
A Python question (26% of today’s postings name Python). More in the Python skill test.
Answer: A list can be changed after it is made, a tuple cannot. Lists are mutable (changeable); tuples are immutable.
What does this print? for i in range(3): print(i)
A Python question (26% of today’s postings name Python). More in the Python skill test.
Answer: 0 1 2. range(3) counts from 0 up to, but not including, 3.
Questions about how you work
Tell me about a time a rule or regulation slowed your work down. What did you do?
64% of today’s 50 open controls and PLC engineer postings with a full description mention compliance or regulation.
A good answer shows: That you followed it and still delivered, not that you went around it.
How much are you able to travel for work?
42% of today’s 50 open controls and PLC engineer postings with a full description mention travel.
A good answer shows: An honest number of days or share of time, so there are no surprises after the offer.
Can you work the shifts, nights or weekends this job needs?
32% of today’s 50 open controls and PLC engineer postings with a full description mention shifts, nights or weekends.
A good answer shows: A clear yes, or your exact limits, said early.
Tell me about something you owned from the first idea to the result.
28% of today’s 50 open controls and PLC engineer postings with a full description ask for ownership or end-to-end work.
A good answer shows: That you saw it through when it got hard, with a number for the result.
Tell me about a time plans changed at short notice. How did you adjust?
26% of today’s 50 open controls and PLC engineer postings with a full description describe a fast-paced place.
A good answer shows: A quick new plan, what you dropped on purpose and how you kept others informed.
Have you helped someone else get better at their work? What did you do?
22% of today’s 50 open controls and PLC engineer postings with a full description mention mentoring.
A good answer shows: A specific person and skill, how you taught it and how they did afterwards.
Questions almost every interview has
Tell me about yourself.
Almost every interview opens with it.
A good answer shows: Under a minute: your current work as a controls and PLC engineer, one result with a number and why this job is the next step. Not your whole resume.
Why do you want to work here?
It tests whether you read about the company.
A good answer shows: Something specific: a product, a goal from the posting or a problem you can help with.
Why are you leaving your current job?
It checks for problems you might bring along.
A good answer shows: What you are moving towards, said briefly, with no criticism of your employer.
What are your salary expectations?
Only 47% of today’s controls and PLC engineer postings state pay, so be ready to name a figure.
A good answer shows: A range you can defend. Today’s 157 controls and PLC engineer postings that state a yearly US-dollar range advertise a median of $164K; the middle half $142K to $192K. Ask for their range first if you can.
What is one of your weaknesses?
A classic, still asked.
A good answer shows: A real weakness that does not block this job, and what you do about it.
Do you have any questions for us?
The last question of almost every interview.
A good answer shows: Two or three questions you prepared; the list below has some.
Questions to ask them
- What would make someone in this role successful in the first six months?
- It shows you think about results, and the answer tells you what the job really is.
- Why is this role open?
- A new role, growth or someone leaving: each tells you something different.
- What is the pay range for this role?
- Only 47% of today’s controls and PLC engineer postings state one; asking is normal.
- How will my work be measured, and how often will we review it?
- You learn what matters to your manager before you start.
- What are the next steps, and when will you decide?
- You know when to follow up, and you can plan around other offers.
Questions about a controls and PLC engineer interview
- What questions are asked in a controls and PLC engineer interview?
- Questions about the skills the postings name (SQL), about how you work (compliance and regulation, travel, night and weekend shifts) and the questions almost every interview has, such as “Tell me about yourself” and your salary expectations.
- How should I answer controls and PLC engineer interview questions?
- With a real example: the situation, what you had to do, what you did yourself and the result, with a number. This is the STAR method; aim for 60 to 90 seconds an answer.
- How do I prepare for a controls and PLC engineer interview?
- Prepare three real stories with a number each (a result, a problem you solved, work with other people), practise them out loud for 60 to 90 seconds, and revise the skills the postings name most: SQL. Read the posting again the day before: the duties it lists are what they will ask about.
- Is a controls and PLC engineer interview hard?
- It depends on the level: today’s controls and PLC engineer postings ask for 5 years of experience at the median. Most interviews mix questions about the skills in the posting with questions about how you work; the technical part is easier with a real example ready for each skill.
- What salary should I ask for as a controls and PLC engineer?
- Today’s 157 controls and PLC engineer postings that state a yearly US-dollar range advertise a median of $164K. Adjust for your experience and the country, and ask for their range first.
Prepare with
Interview answer builder
Turn an example into a 60 to 90 second answer, with checks for a number and for “I”.
The controls and PLC engineer resume example
The results interviewers ask about, written as resume lines.
Thank-you email
Send it on the day of the interview, written from four fields.
347 open controls and PLC engineer jobs
Read from employers’ own careers pages every hour.
Everything about controls and PLC engineer work
Counted from the open postings on Nov 15, 2026, read from employers’ own careers pages and recounted on every update. The questions are ours; no employer’s interview is copied here.