Not sure if you are answering a specific past question or one you have set yourself. Also don't comprehend "testing before installation".
If this were an IRSE question, you would need to explain briefly each separate test; although I have been a tester for the est part of 30 years I do not understand all your terms and ther is nothing else to help me.
A context statement describing scenario at the beginning would have been good. Without it, I am having to guess that you are describing a signalbox with levers which are mechanically interlocked but with electric locks perhaps for some track circuit controls. Point operated by electric point motor operated from the levers and with levers unable to complete their full stroke until site detection has been achieved; am I right?
1. I know what bell testing is, but it only makes sense to do this one wire at a time to prove continuity between two places; therefore do not understand 2 wire bell testing.
2. I am guessing that this is mechanical locking between levers to check that 1 locks 2, 2 locks 1; 3 release 4, 4 released by 3, perhaps conditional locking involving the position of a third lever, or sequential (no-reciprocal) locking.
3. I do not know this term; perhaps you have a specific Control Table for cascaded route locking (NR has recently introduce sub-route / sub-overlap CTs for SSI) and tets against that. However unusual for a type of signalbox that I am assuming from the rest of your answer to have much route locking. Perhaps you mean testing of each route, but again this sounds more like a route setting panel than my assumption re your scenario.
4. I think I know what this is, but I guess that it will primarily be the dead track locking and any route locking that there may be. I am still assuming that there will be no point calling except from the lever itself.
5. Perhaps this is a "Emergency Replacement of all the signals controlled from the signalbox"- again I can't really rationalise with the scenario I envisaged
6. This is clearly what I thought 4 would have been, so now I am unclear about 4.
7. This is what made me decide on assumption of scenario; to me this means point levers having an (NBDR) lock, so that having pulled lever from N some three quarters of the way to R and energised the point motor, it then need the EKR to pick to energise the lock again to get the lever fully R in order that the mechanically interlocked functions can now be released. Hence I understand this to be what we would call point correspondence.
8. I am guessing that the signals are colour lights driven from the signal lever and this element of testing proves all the track controls, perhaps also point detection and other miscellaneous controls.
9. I am guessing that this is what I'd call aspect sequence testing- checking that the signal in rear displays an aspect dependent on that displayed by the signal in advance to make sure driver given adequate warning of the need to stop or slow for a junction.
10. Not sure what this is; in the UK we often prove the TPWS train protection within the signal's red indication so perhaps this is what it means, but I don't think so.
11. I guess this is interlocking with a level crossing gate (where there is one)
12. I guess this may be a release given by the signalbox to release a ground frame for local operation of points, but only when no conflicting moves set at the signalbox.
13. I interpret this to mean the holding of the route in circumstances when a signal has been replaced to danger and the various potential releases (train passage, timer, perhaps comprehensive).
14. No real idea what square testing is. My guess is that it is a check that all the valid "operational moves" can be made and that there isn't inadvertent overlocking that unnecessarily restricts freedom of movements.
As you can see, I had to do a lot of guessing. As a list, your answer might have been quite good, but it needed flesh on the bones of the skeleton. Describe what that test is and explain why it is necessary, what it is seeking to prove annd it could have been the basis of a good answer. However as you wroye it, it was a list of some terms I thought I recognise and some I know I don't and therefore you wouldn't have got many marks for it in that form.
(16-08-2011, 02:18 PM)SARVESH KUMAR Wrote: Question 1. Testing of signalling system before installation & commissioning
Answer:- testing of signalling system before commissioning are given below
1. one wire and two wire bell testing
2. locking test
3. route locking table testing
4. point control table testing
5. all emergency operation testing
6. track locking of point testing
7. indication locking of point testing
8. aspect control chart testing
9. cascading of signal aspect testing
10. red lamp protection testing
11. locking of gate circuit testing if available
12. locking of slot testing if provided
13. approach locking testing
14. square sheet testing if provide:- square sheet test for parallel/conflicting/simultaneuos movement for carried out for all installation of signalling gears