Jet exhausts get very hot. We need turbines in the exhaust to power the compressors. How would you stop the turbine blades from melting?
That was the strange question that greeted my eighteen year old self in the interview for college. I can't remember exactly what I answered, but it was enough to get me in the door.
There were two tutors doing the questioning. The professor was my main tutor through the course and after a long career as an expert in thermodynamics he finally retired this year. The young research fellow, after a year of continually stressing the importance of our department, left to pick up big City bonuses. I have learned that sort of thing happens a lot in business.
And why did they ask that question? After so many years, Rolls-Royce Aeronautics are still sponsoring the Engineering fellowship at my college.