Mechanical Engineering Technician Interview Questions UK: 8 Real Questions and What Interviewers Want

Most Mechanical Engineering Technician interviews in the UK follow a pattern, and knowing it beats guessing. Below are eight questions from our bank of 12, each with a note on what the interviewer is really after.

Eight Mechanical Engineering Technician interview questions, and what the interviewer is thinking

1. How do you read an engineering drawing, and what information do you look for before you start making or measuring a part?

Why they ask: They want to know you can interpret drawings accurately, which underpins every task a technician does.

2. Which measuring instruments have you used, and how do you make sure your measurements are accurate and traceable?

Why they ask: Inspection accuracy is core to the technician role and they want to see practical competence.

3. What does a typical day as a mechanical engineering technician involve, and why does the role appeal to you?

Why they ask: They want to see that you understand the practical, support-focused nature of the job and are not expecting pure design work.

4. Can you explain the difference between clearance, transition and interference fits, and give an example of where each would be used?

Why they ask: Fits and tolerances are fundamental to assembling and inspecting mechanical parts correctly.

5. Which CAD packages have you used, and how do you keep drawings and models under proper revision control?

Why they ask: Technicians often edit models and drawings, so they need to see that you work in a controlled way.

6. You measure a machined part and it is 0.05 mm outside the tolerance on a drawing. What do you do?

Why they ask: They want to see how you handle non-conformance without cutting corners or overreacting.

7. Tell me about a time you helped to diagnose a fault on a mechanical system or piece of equipment.

Why they ask: They want evidence of practical, methodical fault-finding rather than trial and error.

8. How would you choose between mild steel, stainless steel and aluminium for a simple bracket?

Why they ask: Material selection shows whether you grasp properties and trade-offs rather than just names.

A sample answer to question 1

How do you read an engineering drawing, and what information do you look for before you start making or measuring a part?

I start with the title block to check the drawing number, revision letter, scale, material and projection, because working from a superseded revision is an easy and expensive mistake. Then I look at the views and sections to understand the shape, followed by dimensions, tolerances, surface finish and any notes on heat treatment or coatings. I check that the general tolerance block applies and whether any features carry geometric tolerances such as flatness, position or concentricity under BS 8888 or ISO GPS. If anything is unclear, for example a missing dimension or conflicting notes, I do not guess. I raise it with the design engineer and get the answer documented. In my college workshop I caught a hole position that conflicted between two views; asking early saved us scrapping a milled plate.

Common mistake to avoid: Working from an uncontrolled copy; guessing a missing dimension

Want the rest?

Full model answers, key points and common mistakes for all 12 questions are on the Mechanical Engineering Technician interview questions page. The first five are free, no sign-up needed.