Pro practiceProtection and Control Engineer practice interview
Protection studies, relay settings, scheme testing, disturbance analysis and dependable control of power system faults. Practise the 6 questions interviewers ask for this role with follow-ups. Paid plans add scored feedback on every answer.
A Pro practice interview, on the Pro plan from ₦5,000 a month billed yearly, or on Premium.
- Mid level
- 20 minutes
- 6 questions
- Scored feedback on paid plans
About the role
This is a technical interview on protection philosophy, relay coordination, scheme testing and fault investigation. The panel is looking for selective protection decisions, disciplined commissioning and accurate control of settings, drawings and evidence.
How to prepare
- Revise overcurrent, earth-fault, differential, distance and breaker-failure protection principles.
- Practise explaining coordination choices with current transformers, grading margins and fault levels.
- Prepare a disturbance example using relay targets, oscillography, sequence of events and breaker indications.
- Review secondary injection, trip-circuit proving and end-to-end testing methods.
- Think through how you control setting revisions and discrepancies between drawings and field wiring.
Common mistakes
- Giving relay setting values without explaining the system data and coordination behind them.
- Treating a successful relay injection as proof that the full trip circuit works.
- Blaming relay failure before checking event records, wiring, breaker status and protection zones.
- Making an undocumented settings change because restoration is urgent.
What to expect
A real first-round interview
6 questions the way interviewers ask for this role, with follow-ups when an answer needs more.
Spoken, like the real thing
Speak your answers in your browser or the free desktop app, with live captions. You can ask the interviewer to repeat anything.
Scored on 4 areas
The things this interview weighs most. With a paid plan, your report shows how you did on each one.
A private report
On Plus, Pro and Premium: every answer scored, your strongest lines quoted and what to say differently next time. Interview creators never see it.
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