Answer Happy

B3 a) The waste hierarchy is a simple ranking system used for the different waste management options according to which is the best for the environment. The most preferred option is to prevent waste, and the least preferred choice is disposal in landfill sites. You are required to draw a diagram to represent the 'Waste Hierarchy from "best" to "worst" and indicate the roles of Restriction of Hazardous Substances (RoHS) and the Waste Electrical and Electronic Equipment (WEEE) in the hierarchy (3 marks) b) What is the difference between 'reliability' and 'availability from a manufacturing point of view? (2 marks)
c) Use the SEED's model, if D=4 defects/cm (0) What is the yield for: (3 marks) • Chip A: a 1mm by 1mm • Chip B: a 7mm by 7mm • Chip C: a 1.2cm by 1.2cm (ii) How many good chips for "Chip A", "Chip B" and "Chip C" from a 6" wafer? (3 marks) (ii) If the packaging costs for "each" Chip A = £1.5; Chip B = £12 and Chip C = £35. The fabrication cost of a 6" wafer is £400. Assume that an electronic system can use either 500 Chip A, or 120 Chip B, or 20 Chip C. Which is the most economic solution based on these packaging and processing costs? (7 marks) Fabrication is a manufacturing process. d) In Lean Manufacturing: (0) What is the difference(s) between 'Pull' and 'Push' systems? (ii) Which one of the above two techniques is the most efficient way of implementing lean manufacturing' and why? (4 marks) e) UNN Ltd, a company that makes different types of circular connector products, is going to change its manufacturing system to a kanban pull system. One of the parts required to produce a product 001 is "part C" and "part C's are made in batches of 30 units. The manufacturing cell which makes "part C" can respond to an order for a batch of "part C" in 1.5 hours. The assembly cell which assembles product 001 has an assembly rate of 15 per hour. The production manager has decided to have 10% buffer in case there is a change in the number of demand for "part C". Given that: The number of kanban cards can be determined using the following formula: Number of kanban cards Demand*Lead time*(1+Safety Stock) The number of units produced What is the number of kanban cards needed? (3 marks) (Total Marks 25)