City Guilds Model Questions Vol1 2020 Engineering Question 46
Practice objective / multiple choice question 46 from the 2020 City Guilds Model Questions Vol1 Engineering examination.
Two identical pumps are installed in parallel to supply water to a plant. Each pump has an exponential time‑to‑failure distribution with a mean time between failures (MTBF) of 1500 h. The plant is considered to have failed only when both pumps have failed. Preventive maintenance restores a pump to "as‑good‑as‑new'' condition and is carried out on all pumps simultaneously at regular intervals of \(T\) hours. Assuming failures in different intervals are independent, determine the greatest value of \(T\) (in hours, to the nearest hour) such that the probability that the plant experiences at least one failure during a 1‑year period (8760 h) does not exceed 5 %.
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About This Question
This is City Guilds Model Questions Vol1 2020 Engineering Question 46. It is one of the objective questions from the 2020 City Guilds Model Questions Vol1 Engineering examination.
Difficulty level: Hard .
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