I am not an engineer, but working with education design in engineering fields, presently battery manufacturing and electromobility. I became interested in your question and found several youtube videos with advice for this kind of specialised interview. Start with https://youtu.be/q7bfYZTXLWM and continue with https://youtu.be/SwRNX-m7Qzs or google yourself.
See also the following link: https://www.aerosociety.com/membership-accreditation/professional-registration/application-routes-and-process/professional-review-interview/
In my opinion, from my experience. Every thing depend on that situation, thus I think you must have basic of knowledge enough. So The most important is preparation yourself both manner (good performance and high confident) and mind (belief in yours). Reply the answer like mindfulness and reply the question with wisdom. for my advise.