Hi Rudder,
lol, yes, I guess I should RTFQ myself! d'oh!
Answer 3 is the best thats available, although if there was something about the gearbox that would be a better answer, although insofar as the gearbox can be consdiered part of the engine I suppose its fair enough.
(my general point is that most aspects of aircraft systems can be figured out if you understand the point of them. I'm naturally lazy and would rather understand than memorise. Which is kind of patronising becuase it implies a proportion of our profession prefer to memorise rather than understand, which is why I am a bit of a git)
N1, Who says answer 3 is no good? What answer is offerred as being correct?