For Emerson, the entire recruitment process involved an aptitude test, then a Technical interview and at the end a HR interview. The aptitude test consisted of basic general aptitude, english and basic instrumentation and measurement questions. Though we didn’t see any filtering based on the aptitude test, it probably did have a take in marking every individual.
The technical interview was more of a rapid fire question oriented discussion over various problems faced in Process Automation and how to solve or act on them. In my interview we hardly discussed any of my personal projects, rather the interviewer was keen on knowing my views on various scenarios that Emerson (or any other Process System based company) tend to face in a more frequent manner.
I believe in that discussion itself, the interviewer was able to judge my general takes on problem solving as well as the knowledge that I have acquired during engineering in college. The HR round was a normal need to know basis questionnaire from their side.