Even among EEs, there is so much specialization, it would be easy to stump a "real" engineer with questions that are outside of his area of expertise.
Ask a digital EE, even a very talented one, to explain the difference between S11, S12, S21 and S22 and you may get a vague answer like "I learned about that in school a long time ago but I never had to use them."
Ask an RF guy, or a data converter designer to explain how a cache memory controller works and you may get a similar "huh?" kind of blank stare...
The question depends upon what type of engineer you are dealing with. EE should know EE things, SE should know softwre things, and CE should know civil engineering things. So you really have to put this question in context.
As a systems engineer, I could answer correctly on a wide range of engineerng topics that are not part of any particular engineering field.
Plus good engineers, are also knowledgable on any engineering discipline that interacts with their field.