09-07-2013, 08:00 PM
(09-07-2013, 08:35 AM)dorothy.pipet Wrote: An untimed, open book attempt for comments please.
What you have put is a lot of detail which, on first reading is a good description of the conditions for each of the indication elements to show. One important thing that the question asks for that is missing is the extent of the overlap. The question specifically asks for the indications associated with the swinging (or alternative) overlaps and hence I would expect there to be some mention of how the end of the overlap is shown.
You mention that the track occupied indications are red, but I cannot see that you have described what the route set indications look like.
You would need to specify what practice you are following because some systems light route indications in the overlap and some do not. If you do not give any clue, the examiner may try to work out what practice you are following, or use the UK as a default. This may work in your favour or may not! You have alluded to SSI, but how this is shown on a panel would vary form place to place in the UK.
I think you have covered this by your note in blue immediately below your diagram, (but it is not clear and I think I have read it right) and that is the matter of making indications big enough on the VDU to avoid single block failure meaning that the indication is not shown correctly, or on a panel having more than just one lamp indication for each function. Arguably, this is something not directly related to the question, but might get you more marks in a borderline scenario).