I have not had the chance to look at the mod 5 papers yet as no on took it at our centre so the "spare" papers that the exam office send to us are still in their sealed envelope.
If your statement about the numbers is correct, you are right that with the given Rfeed, you are not going to get enough to pick the relay with anything else affecting the circuit.
I suspect the view of the examiners will be that 100ohm is fairly obviously a problematic value given the other numbers, and hence would expect candidates bursting with TC knowledge to make some comment.
On the positive note, the examiners look at the cases that are borderline and then start taking other factors into account. I suspect that the term borderline may be a bit more liberal if there is a mistake that may have deprived people of marks. So, if you were borderline credit / distinction with only the few makes that you were genuinely able to get from this question and lots from the other two, the view could well be "excellent candidate, the only thing stopping them was the typo in that question, slot into the higher grade".
I'll try to look at the paper tomorrow and give you some other comments on the numbers.
Peter
If your statement about the numbers is correct, you are right that with the given Rfeed, you are not going to get enough to pick the relay with anything else affecting the circuit.
I suspect the view of the examiners will be that 100ohm is fairly obviously a problematic value given the other numbers, and hence would expect candidates bursting with TC knowledge to make some comment.
On the positive note, the examiners look at the cases that are borderline and then start taking other factors into account. I suspect that the term borderline may be a bit more liberal if there is a mistake that may have deprived people of marks. So, if you were borderline credit / distinction with only the few makes that you were genuinely able to get from this question and lots from the other two, the view could well be "excellent candidate, the only thing stopping them was the typo in that question, slot into the higher grade".
I'll try to look at the paper tomorrow and give you some other comments on the numbers.
Peter