In reverse order, like Eric Morely (who?)
4. C, the verify test. However it does not check correct alignment, etc it merely checks to confirm that input/actuator parameters are within a certain range of values which would correspond to normal operational maxima and minima. To truely check correct alignment the engineer would have to carry out more detailed checks.
3. A, yes 629 is bi-directional whereas 429 is not. The idea was to further reduce wiring and therefore weight. So 629 has integral tx/rx's feeding each data bus but 429 has individual tx's and rx's and, if bi-directional exchange of information was necessary would therefore require 2 separate databusses.
2. What a terrible question! None of the answers provided are truely correct. However, in an animal farm kind of way some are more correct than others. Therefore the correct answer is C, although I would have preferred it if they had listed EHSI, EADI, symbol generators, mode controllers and various input sensors. A refers to the airdata system and B more towards any generic CRT display (radar, EICAS, etc).
1. Another terrible question! However I agree with the majority here that the answer is C. Loss of for example the left ILS would cause the info to be lost on the left EFIS system.
Hope this helps.