I had a technical based interview a while back. A few of the questions that I remember were oceanic contingency procedures, an explanation of de-icing procedures, and a question on what I would do if I was at the aircraft's maximum certified altitude and I had a climb RA.
I had no oceanic airspace experience so I didn't do so well on that one.
There was also a 50 question technical exam covering a lot of subjects including INS theory, loc and glideslope usable areas, lat-long stuff, weather maps, weather report interpretation.
I remember I thought I might have failed it as some answers given were educated guesses but I missed the max distance for a reliable glideslope and the meaning of NOSIG.
All that time I spent studying on Dutch roll theory turned out not to be needed.