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EK-General : 2017/MAR/10 – 2018/DEC/10 – 2022/JUL/10
Question
Q10.During a complete loss of electrical power, essential vital services can be maintained by means of an Uninterruptable Power Supply (UPS).
(a)Describe, with the aid of a block diagram, the operation of an a.c. input UPS arrangement. (7)
(b)List SIX essential services that the UPS may support. (3)
Asked in Year/Month/Ques No.
Marker's Feedback
2018/DEC >> Generally well answered with most candidates scoring highly.
2017/MAR >> (a) Similar comments to question 9 (Some excellent sketches getting full marks and other more basic sketches getting proportionally fewer marks), some excellent block diagrams, well annotated and other very basic efforts which missed out parts of the UPS system.
>> Not many candidates stated the voltages that were transformed and rectified to or the subsequently inverted voltage at the output. (b) No problems, an easy three marks for most.