Reliability Engineer Interview Questions UK: 8 Real Questions and What Interviewers Want

Applying for a Reliability Engineer job in the UK? Here is what you are likely to be asked. These questions come from our Reliability Engineer question bank of 16 questions, written for UK employers at mid-level level.

Eight Reliability Engineer interview questions, and what the interviewer is thinking

1. What is Reliability Centred Maintenance, and how would you apply it to a critical asset?

Why they ask: RCM is the cornerstone methodology of reliability engineering, so interviewers expect a clear grasp of it.

2. Explain MTBF, MTTR and availability, and why MTBF can be misleading.

Why they ask: Basic reliability metrics are a staple of reliability engineer interviews.

3. How would you use Weibull analysis, and what does the shape parameter tell you?

Why they ask: To test statistical skill applied to failure data.

4. What is FMEA or FMECA and how would you run one for a piece of equipment?

Why they ask: FMEA is a core risk tool and a standard reliability task.

5. Which condition monitoring techniques would you use on rotating equipment, and what does each detect?

Why they ask: To test knowledge of predictive maintenance technology.

6. One machine causes a third of your site's breakdowns despite repeated repairs. How would you tackle it?

Why they ask: This is a classic reliability engineer scenario testing structured problem solving.

7. Tell me about a time you used data to identify the root cause of a repeat failure.

Why they ask: To check applied analytical skills with real data.

8. What makes someone a good reliability engineer, and what excites you about the role?

Why they ask: To check understanding of the role and motivation.

A sample answer to question 1

What is Reliability Centred Maintenance, and how would you apply it to a critical asset?

RCM is a structured process for deciding what maintenance each asset needs to keep performing its function in its operating context, as set out in SAE JA1011. For a critical asset, such as a main compressor, I would begin by defining its functions and performance standards, then list the functional failures and the failure modes that cause each, using failure history and expert input. For each failure mode I assess the effects and consequences: safety, environmental, operational or economic. Then I choose the most suitable task: condition-based monitoring where there is a detectable warning period, scheduled restoration or replacement where wear-out is age related, failure-finding for hidden functions such as safety valves, or run to failure if consequences are low. If nothing practical works, redesign may be needed. I run it with operators, maintainers and engineers in the room, then load the tasks into the CMMS and review them after a year using actual data.

Common mistake to avoid: Applying the same PM to everything; running RCM without operators

Want the rest?

Full model answers, key points and common mistakes for all 16 questions are on the Reliability Engineer interview questions page. The first five are free, no sign-up needed.