ITPEC IP October 2021 Question 15
ITPEC IP October 2021 — Question 15 of 100
Three devices in parallel give the lowest probability of complete system stoppage. The system in (d) continues while at least one of its three identical devices works, so it stops only when all three fail. Serial configurations stop after any one failure, and two parallel devices stop when both fail.
Answer (d)
Why not others:
- (a) and (c) are serial systems, whose reliability decreases as devices are added
- (b) has redundancy, but only two parallel devices rather than three
Key rule: Parallel redundancy increases availability because every parallel unit must fail before the entire system stops.
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