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Q1:Question 1 a) Define JIT and Lean Manufacturing and contrast the similarities and differences between the two. Discuss why the ‘Traditional approach’ is more intuitive and what approaches are needed to move toward a JIT scenario? b) Critically appraise five of the nine Just in Time (JIT) techniques e.g. reduction of set up time, TPM etc. highlighting what they are and how they would be implemented c) Describe a tool or technique which can be used to analyse and improve the performance of manufacturing systems e.g. Rank-order clustering, Ishikawa diagrams, Value Stream Mapping Root cause analysis, Pareto Analysis etc. Explain the basic principle behind the technique, how it would be applied and the potential benefits/inhibitors to implementation. See Answer
Q2:I hereby confirm that I have watched at least three videos for materials lab experiments as listed below. List at least three experiments that you have watched. For example, metal tensile testing experiment. 1- 2- 3- To pass the component complete this form and submit it to the Blackboard site. Links to videos https://www.youtube.com/watch?v=cDFwFEUR7rk&list=PLAzjGxrba https://www.youtube.com/watch?v=laZiK34RxLM&list=PLAzjGxrba Ob74Ze712THF 1iutlEjchH https://www.youtube.com/watch?v=9auMxrMYV8U&list=PLAzjGxrba OZ4 NLttfh2k86mSNNDvIxk https://www.youtube.com/watch?v=GT1aZ Civd21&list=PLAzjGxrba Oa Qy0DehKNLv CYNur 9ESg https://www.youtube.com/watch?v=lw68ilveqHQ&list=PLAzjGxrba OaHcbGimpnBBnZdWBGfxRDr OaFlxMjNKZ5EL4Rt4YMII OSee Answer
Q3:Assignment 2 - Reverse-Engineering: Functional Analysis, Design for Manufacture, and Environmental Impacts In this assignment, you are asked to undertake the reverse-engineering of a consumer durable (or similar product) in order to consider its overall design and that of its individual components. Central to the activities you undertake will be the analysis of its design for manufacture, the construction of a function hierarchy (Functional Analysis), and lifecycle analysis. There is a selection of very cheap toasters, irons, and hand-mixers available, and the disassembly is done in groups of four or so, (in order to economize on the number of products destroyed!). However, if you are able to find some other defunct product to use in this exercise, you are welcome to use that, (subject to checking suitability with me). Additionally, if you provide your own product, you can select your own disassembly group size and members. Health and safety are paramount in doing this exercise. It is important that the product you use for this disassembly is disposed of after this exercise. If the product you plan to disassemble uses mains electricity, it is a condition of using it for this exercise that before commencement you cut to electrical lead as close to the product as possible to prevent subsequent use. In conducting the reverse-engineering exercise, you should review the operation and performance of the product and consider how each of the components contributes functionally to the operation of the product. Use this to construct a functional hierarchy./nYou should then select two components from the product and produce a brief report on each discussing the design choices they embody. You should also use the software, Open CL, (to which you will be introduced), to estimate the environmental impacts of your two components. Ensure that the components you choose represent different manufacturing processes, and thus different DFM and potentially different environmental impact issues. (For example, do not select two injection molded components; for maximum marks you need to show an understanding of a wide range of DfM considerations, and even if different components, two components of similar manufacture will tend to embody the same points.) If you are sharing a product, ensure that you chose different components to discuss than those of your colleagues. Probable reasons for the choice of material and choice of manufacturing process should be briefly explained, but far and away more important is that you should highlight features of the component which have been designed to aid manufacture or assembly, (or perhaps compromises in this regard to satisfy other product characteristics). Nota Bene: The DfM/LCA submission should solely focus on those aspects of the components. You should not include a discussion of how you disassembled the product; it is not of interest here. Moreover, whilst you are expected to identify the manufacturing processes used, and the reasons for their selection, you may assume that the reader is familiar with the processes. Generic explanations of the processes are NOT required, and will not gain any marks.See Answer
Q4:Part 2: Designing Lift Arm Assembly In Part 2 of this OEMP project you will be designing two aspects of the Lift Arm Assembly while ensuring functionality of your design. You will be selecting the length of parallel members CD and EB, as well as the height of chair assembly DEF. Throughout this project, all team's will be using US Customary units (pounds, slugs, feet, inches). E LOF do H d hu hg hc Figure 1: Side View (x-y plane) of Pool Lift with variable dimensions The lift arm assembly consists of a four-bar linkage, BCDE, where members CD and BE are the same length and remain parallel to one another at all times. The four-bar linkage ensures that the seat mount/chair DEF will maintain a vertical orientation throughout its motion. The goal of this OMEP is to develop your team's most competent Pool Lift Model allowing for a variety of users to comfortably enter and exit the pool safely. To limit the scope of this project, all teams will use the following dimensions: hc=56 inches and do = d = 2 inches, where he represents the height of pin C above the pool deck, hg represents the height of pin B above the pool deck, and de and d represent the length of hinges G and H, respectively, from the pin to the centerline of the member to which each hinge is attached. The lift arm assembly must be designed to successfully achieve your chair's selected vertical range of motion while limiting the necessary operating range of a angles (suggested less than 60°). Consider how the length of the parallel members and the height of the chair assembly affect the chair's vertical position. • Design the length of parallel members CD and BE (lcp in figure 1). Design the height of chair assembly DEF (DF in figure 1). Select the height of pin B above the pool deck (hg in figure 1). Based on your design, use geometry to find the a angles corresponding to your maximum and minimum chair positions. If your range of operating a angles is greater than 60° you need to consider redesigning lcD and lor as large ranges of angles may cause the hydraulic cylinder to overextend.See Answer
Q5:Problem 1 (10 marks) Minimise: Subject to: f = 2x₁ - 6x₂ + 3x3 + 4x4 + 7x5 + 3x6 + 2x7 91 = x2 + 5x3 + 3x4 x5 + 2x6 + 3x7 ≥ 65 92 = -6x₁3x₂ − 2x3 + x4 + 2x5 - 2x6 ≥ -73 93-7x₁4x2 + 3x3 X₁, X₂ € (2,5,7,8), X3, X4 € {3,4,6} X5, X6 ≥ 0, X7 ER 4x4 + 3x5 - 2x6 x7 ≤-66See Answer
Q6:Problem 2 (10 marks) An I-beam is shown in the figure to the right. Given the following equations and constraints, develop a mathematical model and find the dimensions of a beam with a minimal cross sectional area. Cross sectional area: Section modulus: Bending moment: Axial force: Bending stress: Axial stress: Stress constraint: Buckling constraint: X₂ ↓ X4 TH A = x₁x₂ + 2x3x4 - 2x₂x4 S = X₁ (X3X4+*1X2) M = 350 P = 140 Og = Op -142* 1000M S OB + Op- 10P A 180 ≤0 (1+%² 1+171 SO And subject to the following constraints on plate thickness and width: x₁:38,40,41 x₂: 1.9, 2.2, 2.4 x3: 28,30,33 X4: 1.1, 1.3, 1.5 ·X₂ cm² cm³ kNm kN MPa MPa MPaSee Answer
Q7: Individual Report (25%) Report Length: Approximately 1250 words equivalent (no more than 1500 words). Scenario: You are required to lodge a patent application for one of the inventions listed on the course webpage. Those inventions occurred in the past. Therefore, imagine if you were at that time and were asked to write a patent application. You must write a statement indicating how this invention is new, useful, and innovative. The application should include a title, abstract, description, up to five claims, and CAD drawings. The Task: 1) 2) Read the description of a selected invention that explains the effectiveness, novelty, elegance, and genesis of the product. You may have to do some background research as well, to identify why it is innovative and how it works (its functionality) Write a statement as a part of the patent application. Your statement should include a) b) c) e) Title Abstract (summary of your statement which enables the reader to quickly identify your invention) *Description of the product **Claims (at least 5) *** SolidWorks CAD Drawings * The description must • • • highlight the current issues; if the invention was made as a result of current problems and/or a specific problem that you are going to address with the proposed product describe the features you consider essential in the way that the invention works (i.e. efficiency, novelty, elegancy, and genesis) include specifications (details of each function of the product, e.g. what they consist of, and their positions, use figures/ drawings; use numbers when explaining different parts of the figures; materials to be used in the product/ preferred choice of materials) **Claims are important because they determine the scope of the monopoly given by a patent. The claims must, • be clear and concise • • • distinguish your invention from what is already known (because cannot get a patent for what already exists) set out all the essential technical features of your invention (features for which you wish to get a patent) be consistent with the description. Note: Statements about the advantages of your invention are not suitable as claims. ***The Drawings • • must be created using a SolidWorks model/drawing that you create to scale (or similar software such as AutoCAD, Revit, etc) with well-defined linework. All model and drawing files must be submitted. (Hand drawings are not permitted and Providing a model without a drawing is not sufficient for this assignment. the 3rd Angle orthographic views (front, side, and top) are recommended and isometric views can also be used to help show necessary details. You must provide sufficient views to fully display your design. TOP VIEW LEFT BACK END VIEW FRONT VIEW A. ORTHOGRAPHIC UP RIGHT LEFT FRONT DOWN UTBJ0007 B. THREE-VIEW ISOMETRIC • Do not include any descriptive wording or dimensions on the drawings. • You must label your views with terms such as front, side, or isometric perspective view. • • The drawings should be placed on an A4 page size with a title block stating the scale of the drawing, the author's name, and other necessary details. Landscape or portrait can be used. • All figures must be numbered starting at Figure 1. • • The items referred to in the text must be itemised in the figures starting at Item 1. Shading and cross-hatching can be used to help show a visual feature of your design. Dashed lines can be used to help highlight features on your drawings. What you will be assessed on: Format: Whether you can identify the innovative features of the chosen product Whether you can document the specifications of a product using the appropriate writing style Your engineering drawing skills, and Your general writing skills (i.e whether the writing is clear and concise, correct tense, etc) You should format your patent according to IP Australia guidelines A guide to applying for your patent (Australian Government, IP Australia) – page 17-18 contains an example Before you start have a look at some UniSA patent applications: • Weed seed devitalization arrangement • - Plastic automotive mirrors - (please note this is a US patent therefore the format is different) Additional resources: Australian and overseas patent databases- Patent Cooperation Treaty database - in this database, you can browse actual patent applications Marking Guide Criteria Format & general writing skills • • Well set out, easy to read. Correct paragraphing, spelling, tenses, etc.; concise writing, well expressed; The sections (e.g. description, claims, etc) are in the correct order. (2 points) Acceptable presentation but could be improved, Adequate paragraphing but some spelling or grammatical errors.; Some errors in the order (1 point) . The format is not correct; many spellings or grammatical errors ( 0-1 points) Description • Claims: Very good description provided; materials used are mentioned; functionality of the product is clear and supported by clearly labeled drawings/figures where appropriate. Novelty and efficiency of the product are highlighted (9-10 points) An adequate description is provided and supported by drawings/figures where appropriate. Could include more details of materials used/ novelty/ efficiency of the product (6-8) An average description is provided. Supporting materials used were not clearly labeled/ referred to within the main text. Need more details of functionality/materials used/ novelty/ efficiency of the product (4-5) Description poor; lacks detail and requires more supporting materials (figures/ drawings) (0-3) Marks Feedback /2 /10 /5 • • An appropriate number of claims are provided. Claims are clear and concise and consistent with the description; haven't left out any important features. (5) An appropriate number of claims are provided and consistent with the description, But some claims may be unclear/ too long/ be missing some important features. (3-4) Claims are not appropriate/ poorly stated. Missing important features. (0-2) Abstract: • The Abstract has an appropriate length. Readers can quickly identify the features of the invention by reading this abstract. (2) Abstract can be improved; abstract omits some important features/ information or is too long. (1) • Poor abstract; difficult to understand; lacks detail/too much detail. (0-1) Drawings: • • The drawings are to scale and without any descriptions or dimensions. Appropriate views are used to clearly show the invention. A title block is used to state relevant information. Each figure is numbered (starting at 1) and labeled with view type. All items described in the description are identified on the drawing with an item number and leader (starting at 1). (5-6) The drawings could be improved to help clarify the design, match the description and meet the requirements of the drawings. (3-4) The drawings lack detail to help explain the invention and do not meet the drawing requirements. Drawings may not have been created with CAD or the source model files are not included with the submission. (0-2) 12 /6See Answer
Q8:Q2) When storing chocolates, care must be taken to avoid the fat bloom at high temperature and sugar bloom on the surface of the chocolate at low temperature. It is best to store chocolate at constant temperature. However for practical reasons to the present exercise, let's say it is required to avoid the temperature below 10 °C and should not exceed 20 °C. Use the utility plot and graph the usefulness of the gain in performance by stetting the S- curve as measure for the performance for the chocolate bar over the given temperature range. Define the values of the plot and the variable at the abscissa.See Answer
Q9:Q3) The auxiliary power unit for trucks (APU) provides air conditioning during driving breaks while eliminating the need to idle the engine. This technology could help eliminate large quantity of carbon dioxide emissions from truck idling. Designing such APU requires considering the house of quality of such design. The APU has a maximum weight of 75 kg with a turbine weight of 3kg and 2.5 kW shaft power. It operates at control inlet temperature of 1000°C. The target of bleeding air will be specified at later stage. Consider using a house of quality (HoQ) to explore the Auxiliary Power Unit for trucks (APU). A manufacturer wants to explore the possibility of designing an APU that satisfy the drivers (Who). The information and the table below are prepared by the designer for HoQ elements (Hows, Whats, Who, Now and Target (How much)). Do the followings; Use the information given in the table below to construct the complete HoQ (make sure the What's, the Who's, the How's, the Now's and Targets are shown in the HoQ) Use the given ranking values and the Symbols to a) Use the information given below to construct the complete HoQ b) Do tradeoff between How's Versus How's c) Rank the evaluation of the Who (Drivers) versus What's d) Rank the evaluation of the How's versus What's e) Calculate the importance rating of the How'sSee Answer
Q10:-- PIFCO INSTRUCTION MANUAL/n ENG3017 Mechanical Design 3 2023-24 Assignment 2 - Reverse-Engineering: Functional Analysis, Design for Manufacture, and Environmental Impacts (20% of total module assessment) In this assignment you are asked to undertake the reverse-engineering of a consumer durable (or similar product) in order to consider its overall design and that of its individual components. Central to the activities you undertake will be the analysis of its design for manufacture and assembly, the construction of a function hierarchy (Functional Analysis), and a lifecycle analysis. There is a selection of very cheap toasters, irons and hand-mixers available, and the disassembly is done in groups of four or so, (in order to economise on the number of products destroyed!). However, if you are able to find some other defunct product to use in this exercise, you are welcome to use that, (subject to checking suitability with me). Additionally, if you provide your own product, you can select your own disassembly group size and members. As you conduct the reverse-engineering exercise, you should review the operation of the product, and thus consider how each of the components contribute functionally to the operation of the product. Use this to construct a functional hierarchy. Construction of the functional hierarchy will be conducted as group exercise in class, in the tutorial sessions of 25th Jan, and 1st Feb. There is no formal assessment of this, but if absent, you may be required to submit a single page function hierarchy for your product, (not a report), to demonstrate you have engaged with this content. (Failure to engage may result in a reduction of one grade point on this assignment.) Health and safety is paramount in doing this exercise. It is important that the product you use for this disassembly is disposed of after this exercise. If the product you plan to disassemble uses mains electricity, it is a condition of using it for this exercise that, before commencement of the disassembly, you cut the electrical lead as close to the product as possible to prevent subsequent use. For the individual assessment, you should then select two components from the product and produce a brief report on each, discussing the design choices they embody. You should also use the software, OpenLCA, (to which you will be introduced), to estimate the environmental impacts of your two components. Ensure that the components you choose represent different manufacturing processes, and thus different DfM issues, and potentially different environmental impact issues. (For example, do not select two injection moulded components; for maximum marks you need to show an understanding of a wide range of DfM considerations, and even if of very different in function, two components of similar manufacture will tend to embody the same points.) If you are sharing a product, ensure that you chose different components to discuss than those of your colleagues. Probable reasons for the choice of material and choice of manufacturing process should be briefly explained, but far and away more important is that you should highlight features of the component which have been designed to aid manufacture or assembly, (or perhaps compromises in this regard to satisfy other product characteristics). Nota Bene: The DfM/LCA submission should solely focus on those aspects of the components. You should not include a discussion of how you disassembled the product; it is not of interest here. Moreover, whilst you are expected to identify the manufacturing processes used, and the reasons for their selection, you may assume that the reader is familiar with the processes. Generic explanations of the processes are NOT required, and will not gain any marks. Deliverables Design for Manufacture (Individual Submission) - 20% of total course assessment A report on two components. In effect this should be in the form of two mini-reports. (i.e., There is no requirement for a general introduction or overall conclusion.) Word count For guidance, 800 - 1200 words should be sufficient (2 components x 400 - 600 words per component/sub-assembly). You should not worry if you are slightly over or slightly short of this target, but long-rambling irrelevance and omission of relevant points are sins of equal measure. Hand-In Thursday 15th February 2023, before 12.00 noon (i.e. before the tutorial)See Answer
Q11:I have shared the hw and it is almost done you just need the calculations for d1,d2,d3,d4,d5. I HAVE MARKED THEM IN THE SECOND FILE d1 is a pulley d3 and d4 are both gears d5 is a bearing So the calculations for the diameter (d) of each is different./n Below is a Project #1 depiction of a CNC gearbox shaft. Given the provided data, determine the diameters of the Shaft in each respective section. 300mm Rotation (direc direction C.W. Pulley 50m (тор) Meshing to another gear Gear I ૧૦ 40"m 50% m Gear 2 ножи Bo Bearing 20 200 ww & Meshing to another! gear from bottom! Bearing 180mm di + Given: Belt FP کم Аз Idu ds * Assume the above design * * Input Power on pulley : 30 hp. Shaft rotational Speed = 380 rpm * Output: (gear 1 uses 15 HP Periodically & 15. hp every 30 Sec gear 2 consumes 15hp uniformly + Sur = 800mpa, Sys 580 MPa, ng=3, Ground Surface, Washr=0.25W+ * G₁ & G₂ are helical gears, Assume: Wa=W₁ = 0.25W+ Wa direction for G₁| Wa direction For G2.4 × те RAZ A Wai P = Tw₁ => T == P 2 NU Wri Watt Wr (30x736) 380x27 60 rody Bec = 3700 N Wrz Gu Waz WT₂ 555 N.m RBZ B Fp= тр 555 rp ✓2 300 x 10-3 То 277.5 TM-m + TG2 277.5 TG₁ = 1/2 Tp = 555/2 = 277.5 N.m мал Ты 0 Min 30 30 → (sec) N.M I (N·m) 555 it (sec) 277.5 ++ (sec) TG₂ = 1/2 Tp=277.5 N.m =To₂m * This torque is applied to the shaft from point P to G * From G₂ to B: T=0 From Gi to G₂T= 277.5 (2) b Constant N.m 555-277.5 Tas Between points P to Gg. : 2 Tm= 555+277.5 2 ≈13865 P N-M 416 N.m PORT C₂ To B & Ta=Tm=0, Point G₁ to Gz: Tm = 2775 N-m VG W+1= TC ล 277.5 0.09 = 3082N Wr25 کے TG₂ 277.5 VG₂ s 0.09 Given: Was Wr= 0.25W+ 3082N N Wal = Wr₁ = 0.25W+₁ = 1770.5 Waz Wr₂ = 0.25 W+z: 1770.5 N MG Waix VG₁ = 770.5x0.09 = 69.3 N.m 5) C.C.W. 1 MG25 WALK VG₂ = 770.5x0.09 = 69.3 N.m "C.C.W. (3)See Answer
Q12: MAIN INSTRUCTIONS Assignment: New or Evolved Product Manufacture and Launch - 3000 words. The assignment requires you to plan the production and introduction of a new product using a concurrent engineering approach. You should consider your product to be new to the market or at least a new variant of an existing product. You must first decide on a product, it may be a: mobile phone, computer, electric drill, food mixer, electric kettle, pen, watch or anything you choose. Whichever product you select, it should have at least 10 component parts so that you are able to plan its production and describe the process planning requirements. If you select a complex product like an automobile, you can restrict your process planning to one of its sub-assemblies. Also describe the design of the product development. You are expected to cost out the project from the initial concept stage to delivery of the product. This includes the design of the product, design and creation of the manufacturing facilities; the cost of manufacturing operations; sales and delivery. You must explain whether you will manufacture in your own factory or sub-contract the manufacture, how and where the product will be assembled? Whatever you decide to do, I still require the process planning and method of manufacture to be described. Also if you subcontract the manufacture I want to know how you will protect your product so that it cannot be stolen by the sub-contractors. You need to imagine that you have decided to invest your own money into this project and this will motivate you to make the new product introduction and launch a success. An important decision is to decide the price that the product will sell for and also the anticipated volume of annual sales. You also need to decide on your profit margin in order to evaluate your budget. You should make sketches of your product, it would be good to do this using our CAD facilities but it is also acceptable to provide hand drawn sketches I expect to see the following sections in the essay, the percentages indicate the proportion of the mark that can be obtained for each section 1. Drawings of the product & component parts 5% 2. A section on the design, prototyping and test strategy, the materials used should be specified and justified for each component part. 10% 3. Description and justification of the manufacturing processes used to produce each component. 35% 4. Design of the manufacturing facilities & protection of the product if subcontracted. 15% 5. Description of the business management software tools that you will use . 5% 6. Cost analysis over a 3 year period to estimate the profit. 15% 7. Environmental protection strategy. 5% 8. Quality of the Essay REQUIREMENT Student shared a Product attached in Refernce section and you need to arrange it in 3000 words in a clear format by following the above mentioned 8 steps. If anything is incomplete, you have to complete it.See Answer
Q13:It is desired to design and manufacture continuous and aligned glass fiber- reinforced epoxy having a tensile strength of at least 1250 MPa in the longitudinal direction. The maximum possible specific gravity is 1.50. Using the following data, determine whether such a composite is possible. Justify your decision. Assume a value of 20 MPa for the stress on the matrix at fiber failure.SSee Answer
Q14:Question 2 ‘Smoothtools’ manufacturing company want to enter the ‘woodworking tools’ market and one of the first products it has decided to manufacture is a general purpose smoothing plane. (See Figure Q2- parts view). After ‘reverse engineering’ the wood plane, the planning department have arrived at a build sequence and timings for each task which is shown in Table Q2(a). Furthermore, the marketing department at ‘Smoothtools’ have produced a sales forecast for the new planes which is given in Table Q2(b). The plant is expected to have a work pattern of 40 hours week, 48 weeks per year. Assuming a Product layout (Long thin) arrangement, determine the following information for the 1st quarter of production: a) The required cycle time and the theoretical minimum number of people required to assemble the products (5 Marks) b) The ‘line design’. (5 Marks) c) The actual number of people required to manufacture/assemble the product based on your design and what would be the balance loss and estimated output for this arrangement? (6 Marks) d) If a ‘short fat’ layout is used in the 1st quarter, how many people would be required to assemble the products? What is the balance loss and potential output for this arrangement? (6 Marks) e) Considering the two options. Which layout is best suited to meet the demand in 4th quarter and why? (12 Marks) f) What are the advantages and disadvantages of both ‘long thin’ and ‘short fat’ layouts? See Answer
Q15:Question 1 a) Define JIT and Lean Manufacturing and contrast the similarities and differences between the two. Discuss why the 'Traditional approach' is more intuitive and what approaches are needed to move toward a JIT scenario? b) Critically appraise five of the nine Just in Time (JIT) techniques e.g. reduction of set up time, TPM etc. highlighting what they are and how they would be implemented c) Describe a tool or technique which can be used to analyse and improve the performance of manufacturing systems e.g. Rank-order clustering, Ishikawa diagrams, Value Stream Mapping Root cause analysis, Pareto Analysis etc. Explain the basic principle behind the technique, how it would be applied and the potential benefits/inhibitors to implementation.See Answer
Q16:Question 2 'Smoothtools' manufacturing company want to enter the 'woodworking tools' market and one of the first products it has decided to manufacture is a general purpose smoothing plane. (See Figure Q2- parts view). After 'reverse engineering' the wood plane, the planning department have arrived at a build sequence and timings for each task which is shown in Table Q2(a). Furthermore, the marketing department at 'Smoothtools' have produced a sales forecast for the new planes which is given in Table Q2(b). The plant is expected to have a work pattern of 40 hours week, 48 weeks per year. Assuming a Product layout (Long thin) arrangement, determine the following information for the 1st quarter of production: a) The required cycle time and the theoretical minimum number of people required to assemble the products b) The 'line design'. c) The actual number of people required to manufacture/assemble the product based on your design and what would be the balance loss and estimated output for this arrangement? d) If a 'short fat' layout is used in the 1st quarter, how many people would be required to assemble the products? What is the balance loss and potential output for this arrangement? e) Considering the two options. Which layout is best suited to meet the demand in 4th quarter and why? f) What are the advantages and disadvantages of both 'long thin' and 'short fat' layouts? See Answer

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