City Guilds Model Questions Vol1 2017 Engineering Question 39
Practice objective / multiple choice question 39 from the 2017 City Guilds Model Questions Vol1 Engineering examination.
A machine has two critical components. Component A is maintained continuously (preventive interval \(T_A=0\)). Component B fails exponentially with rate \(\lambda_B = 0.0005\) h\(^{-1}\). A preventive maintenance action on B costs \$45 and restores the component to "as‑good‑as‑new". A corrective repair after failure costs \$350. Using the renewal‑reward theorem, find the preventive‑maintenance interval \(T_B\) (in hours) that minimises the long‑run average cost per hour for component B. State the optimal policy.
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About This Question
This is City Guilds Model Questions Vol1 2017 Engineering Question 39. It is one of the objective questions from the 2017 City Guilds Model Questions Vol1 Engineering examination.
Difficulty level: Hard .
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