City Guilds Model Questions Vol1 2018 Engineering Question 3
Practice objective / multiple choice question 3 from the 2018 City Guilds Model Questions Vol1 Engineering examination.
A machine consists of three components in series. Their exponential failure rates are \(\lambda_{1}=0.01\ \text{h}^{-1}\), \(\lambda_{2}=0.02\ \text{h}^{-1}\) and \(\lambda_{3}=0.015\ \text{h}^{-1}\). When a component fails it is repaired immediately; the repair times are \(\tau_{1}=2\ \text{h}\), \(\tau_{2}=1\ \text{h}\) and \(\tau_{3}=1.5\ \text{h}\) respectively. Assuming negligible time between successive failures, calculate the steady‑state availability of the machine (as a percentage, to one decimal place).
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About This Question
This is City Guilds Model Questions Vol1 2018 Engineering Question 3. It is one of the objective questions from the 2018 City Guilds Model Questions Vol1 Engineering examination.
Difficulty level: Hard .
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