City Guilds Model Questions Vol1 2018 Engineering Question 21
Practice objective / multiple choice question 21 from the 2018 City Guilds Model Questions Vol1 Engineering examination.
A workshop must produce 5,000 good aluminium components that require a dimensional tolerance of ±0.02 mm. Two manufacturing routes are available: - Process A (CNC milling): setup time 2 h, cycle time 0.8 min per part, machine cost ₦150 per hour, scrap rate 2 %. - Process B (investment casting followed by drilling): setup time 5 h, casting cycle time 1.5 min per part, machine cost ₦120 per hour, scrap rate 0.5 %; after casting each good part requires an additional drilling operation of 0.3 min at the same machine cost. Assuming both processes meet the tolerance, which process yields the lower total production cost and what is that cost (in naira, rounded to the nearest naira)?
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About This Question
This is City Guilds Model Questions Vol1 2018 Engineering Question 21. It is one of the objective questions from the 2018 City Guilds Model Questions Vol1 Engineering examination.
Difficulty level: Hard .
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