27-01-2009, 07:31 PM
Hort Wrote:Hello everyone, this is my first post on the forum!
PJW,
I attempted question 9 of Module 5 2008 without any prior revision in an attempt to gauge how difficulty the exams are. I compared my answers to yours and I realised that where I stumbled was not knowing that the ratio of release current to operating current for a track relay is 68%, I later found this in BR938. Could you please tell me how many marks do you think I would have lost if I stated in my answer that I assumed a certain ratio (not 68%) and used the same methodology to calculate my answer? I would just like an idea of how much weight, in terms of marks, is given in the exams to remembering such details.
Regards
Gethin
My guess noe at all for not quoting that value; doesn't have to be any particular relay. Yoy would have to quote something reasonable; i.e. recognise that there would be a significant difference between DA and PU currents. IRSE are not interested at all in the detailed recall of values as the exam is not about MEMORISING FACTS. It is very keen that people have INHERENT UNDERSTANDING so "order of magnitude / indicative values" are absolutely fine.
PJW