City Guilds Model Questions Vol1 2025 Engineering Question 29
Practice objective / multiple choice question 29 from the 2025 City Guilds Model Questions Vol1 Engineering examination.
A conveyor belt's efficiency declines linearly with time according to \(E(t)=100\% -0.5\%\,t\), where \(t\) is measured in months. When efficiency falls below \(80\%\), a maintenance action restores the efficiency instantly to \(100\%\) at a cost of ₦1500 and takes negligible time. While operating below \(80\%\), the belt incurs a loss of ₦200 per month for each percent its efficiency is under \(80\%\). Determine the maintenance interval (in months, to one decimal place) that minimizes the average total cost per month (including both maintenance and loss costs).
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About This Question
This is City Guilds Model Questions Vol1 2025 Engineering Question 29. It is one of the objective questions from the 2025 City Guilds Model Questions Vol1 Engineering examination.
Difficulty level: Hard .
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