City Guilds Model Questions Vol1 2021 Engineering Question 18
Practice objective / multiple choice question 18 from the 2021 City Guilds Model Questions Vol1 Engineering examination.
During a 1000‑hour production run three machines require preventive maintenance:\n\n- Machine A: one maintenance of 8 h after every 200 h of operation.\n- Machine B: two maintenances of 5 h each after every 250 h of operation.\n- Machine C: one maintenance of 6 h after every 300 h of operation.\n\nAt most two machines can be under maintenance at the same time, and any overlapping period reduces the effective downtime by 20 % of the overlapped duration (i.e., an overlapped hour counts as 0.8 h of downtime). Determine the minimal total effective downtime (in hours) for the plant over the 1000‑hour period.
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This is City Guilds Model Questions Vol1 2021 Engineering Question 18. It is one of the objective questions from the 2021 City Guilds Model Questions Vol1 Engineering examination.
Difficulty level: Hard .
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