ITPEC IP April 2019 Question 14
ITPEC IP April 2019 — Question 14 of 100
Three devices in parallel give the lowest probability that the entire system stops. A parallel group continues as long as at least one device works, so configuration (d) stops only if all three identical devices fail. Two parallel devices require both to fail, while any serial configuration stops when even one device fails.
Answer (d)
Why not others:
- (a) and (c) are serial systems, so every device must remain operational
- (b) has redundancy, but only two parallel devices rather than three
Key rule: Series components reduce system reliability because all must work; parallel redundant components improve it because only one must work.
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