City Guilds Model Questions Vol1 2023 Engineering Question 21
Practice objective / multiple choice question 21 from the 2023 City Guilds Model Questions Vol1 Engineering examination.
A critical system consists of two components in series. Component 1 is maintained preventively every 200 h and its reliability over the interval is constant at \(R_{1}=0.98\). Component 2 is subject to exponential degradation: immediately after a preventive maintenance its reliability is \(0.99\) and thereafter it follows \(R_{2}(t)=0.99\,e^{-0.0005 t}\) where \(t\) is the time (in hours) since the last maintenance. The whole system undergoes a preventive maintenance every 300 h, which restores component 2 to the initial reliability of \(0.99\). Determine the system reliability at the end of the 300‑hour interval.
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About This Question
This is City Guilds Model Questions Vol1 2023 Engineering Question 21. It is one of the objective questions from the 2023 City Guilds Model Questions Vol1 Engineering examination.
Difficulty level: Hard .
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