Not so sure. There are questions related to pipelining, combinational tree loads, retiming etc. For backend ASIC stuff this is valuable things to know and understand. I would say quite a few of the material are quite far from trivial.

If SW people are asked to build linked lists, reversing tree structures etc, I would assume these questions for EEs, CSEEs would be asked too. I know I've asked similar things in the past.

Is there are a source, that you know of, with the types of problems actually encountered in industry? Paid or open. Paper or digital.

My examples were anecdotal based on hiring practices in my current company doing embedded systems. I don't know of any resources that'd help you gnab a job as an EE. I would say be familiar with the basics, first and second order circuits. Op amp configurations, transistors, edge cases, timing, etc.