Mechanical Engineering - Design and Management of Production Systems

Theory questions of the exam collection

Other

19/06/18 Question 1 Please define what does it mean “Demand Planning and Demand Forecasting”. Then, list the main group of methods for Demand Forecasting (be schematic and provide quick examples). Question 2 2.1 What are the “dispatching Rules”? What is their objective? What are their main benefits? 2.2 How do you classify the dispatching rules? Please provide the classification scheme and make comments on the axis. 2.3 Please mention two dispatching rules and explain how they would be positioned in the classification scheme. 3 Question 3 4 Focusing on production planning, briefly describe the stock holding (ownership) cost and its main components, subcomponents and situation (the use of bullets is highly recommended). 09/07/19 Question 1 What is Group Technology (provide a comprehensive definition)? Which are the main steps of Group Technology (as a design methodology for cellular manufacturing)? Please, give also a quick description for each step , ad – when possible – list some examples of method s to be used there. Question 2 Make the most exhaustive list of Pros and Cons of a Job Shop manufacturing system ( at least 6 Pros + 6 Cons ). Question 3 Provide the definition of three flexibility performance (choose among the ones present in the flexibility quadrant) and, for each of them, provide one physical indicator and its description . 10/07/2019 Question 1 Please define the main steps and the main features of the Production Planning and Control (PP&C ) framework in a push approach (phase, goals, constrains, time bucket, time horizon ). Be schematic (a table could be fine). Question 2 Describe ETO and ATO production strategies , underlying the main differences between them. Provide an example of product for each of the two strategies . Question 3 List and describe the critical system design features of the MRP . 14/01/2020 Question 1 Please, define transfer line production systems . Explain the differences between synchronous and asynchronous transfer lines . Finally, list their strengths and weaknesses . Question 2 MISSING Question 3 List and describe the critical system design features of the MRP . 4/02/2020 Question 1 Compare the two inventory models (fixed quantity and fixed time), listing their pros and cons. Question 2 Compare pros/cons of Manufacturing Cells vs Job Shops based on the following aspects: (1) production volumes, (2) WIP, (3) space requirements, (4) investments required, (5) manpower requirements, (6) flexibility, (7) reliability, (8) quality, (9) management complexity, (10) planning complexity. Whi le making the comparison, briefly motivate the difference. Question 3 Provide the definition of three flexibility/quality performance and, for each of them, provide one physical indicator and its description. 13/01/2022 Question 1 Please, define transfer line production systems. Explain the differences with Job Shops and Manufacturing Cells, also listing their respective strengths and weaknesses. Be schematic. Question 2 List 3 flexibility performances, providing their definition (few words) and, for each of them, providing one physical indicator and its description. Question 3 Considering the fixed period interval model for inventory management: • how can you estimate / size the cycle stock and safety stock • draw a general diagram, presenting the expected profile of inventory level and availability level over time. 4/07/22 Question 1 Describe how to design a cellular manufacturing system . Question 2 - Focusing on production planning, briefly describe the stock holding (ownership) cost and its main components, and subcomponents, in case, considering the different company’s situations. The use of bullets is highly recommended. Question 3 - You have to decide which model to use to forecast the demand for the product Watch01 (wristwatch with steel band). Assume you have the time series of the demand of the last two years. 1. Which analyses would you do to decide which forecasting model to use? 2. Based on the results of the analyses (point 1), which forecasting model would you use? 3. Imagine that you have now the following piece of information: the company will sponsor a film which will be released in October 2022 and the Watch01 will be clearly visible on the main character's wrist. Would you additionally, or alternatively, apply other forecasting models? If yes, which ones? 30/08/22 Question 1 What is a transfer line? How can you compare it with Job Shops and M anufacturing Cells (pros and cons, briefly)? How you should design it? Question 2 - List 3 SERVICE performances, providing their definition and, for each of them, provide one physical indicator and its description Question 3 - (a) How can the Economic Order Quantity be computed under the hypothesis of “infinite production rate”? (b) How does it change if that hypothesis is relaxed? Please show the main steps of the demonstration to obtain the formula 12/06/2023 Question 1 W hich are the steps of manufacturing cells design? Which are th e main benefits of this layout? Question 2 - For what concerns demand planning and forecasting which are the possible methods to be used. Provide exa mple and applicability and related pros and cons of each method. Question 3 - In case of Fixed Quantity, EOQ -ROP model, how would you compute the average invento ry level and the safety stock? Draw also a graph to show the level of availability and inventory over time.