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I believe many people will be familiar with the use of controllers and the principles surrounding them. Do you have a particular question?
well i went back and had a look at pages 3 and 4. I can't guarantee all the answers (I haven't used PLC's myself) but I've attached my responses.
It's an embedded module of Control Engineering with NVQ Level 2 in Electronic Engineering.Level 2? What qualification are you working towards?
Well I'm sure you're right about 38, good on you. But I'm also sure I'm right about 39. Overshoot is what happens when you increase temperature more than was wanted.
... and Q28:
You need the switch to operate 2.25 hours per 12 hours. The word 'per' in English is the same as 'divided by' in algebra.
So, you need the switch to be operated 2.25/12 of the time, or 0.1875 of the time.
The switch is operated by the raised part of the cam, and the cam is on a shaft possessing 360* of angle, if it is in this universe.
The word "of" in English is the same as 'multiplied by' in algebra, so 0.1875 of 360* = 0.1875 x 360 = 67.5*.
Clear as mud, now?
... as for Q10, if the switch is momentarily off, it is normally on. Hence pressing the switch causes the sequence on-off-on. This is not a push-to-make switch.
In Q19 I really think the examiners want to test your knowledge of engineering practise. A UPS is a pretty hefty piece of equipment to run memory backup for a counter module isn't it? We'ew only talking about 1 chip here. I think a little battery (correctly a cell, most likely) would be quite enough.
I had a feeling the question was messed up somehow. Would that mean that A is the more right answer out of the 4. However aren't microswitches normally open? by their standard position?... the microswitch question is Q5. I had to have a look! Hell! Ok then d) is incorrectly labelled in that the switch contacts in well-draughted diagrams are shown in the normal position. But in d) the switch is shown as closed to a contact marked normally open, which is contradictory.