Questions and Answers of Operations Management 6th

Using the job times and due dates from Solved Problem 2, determine each of the following performance measures for first-come, first-served processing order: Assume jobs listed in order of arrival.a.
Use Johnson’s rule to obtain the optimum sequence for processing the jobs shown through work centers A and B. JOB TIMES (hours) Job Work Center A Work Center B a 2.50 4.20 b 3.80 1.50 C 2.20 3.00 d
Give a general description of PERT/CPM techniques.
Refer to Problem 2. Determine profit when volume equals 22,000 units.
Processing times for new accounts at a bank are shown in the following table. Five samples of four observations each have been taken. Use the sample data in conjunction with Table 10.3 to construct
After several investigations of points outside control limits revealed nothing, a manager began to wonder about the probability of a Type I error for the control limits used (z = 1.90).a. Determine
This type of problem can be recognized when annual demand (D), ordering cost (S), and holding or carrying cost per unit (H) are given. Use Formula 12–2 for order quantity, Formula 12–1 for total
This type of problem can be recognized when a production rate (p) and a usage rate (u) are given in addition to the basic EOQ information. Use Formula 12–5 to compute the optimal run quantity.
This type of problem can be recognized when the demand rate (d), lead time (LT), and desired service level or stockout risk are given. Use these steps to solve this type of problem:1. Match the
ROP for constant demand and variable lead time. The motel in the preceding example uses approximately 600 bottles of water each day, and this tends to be fairly constant. Lead time for water delivery
This type of problem can be recognized when an order interval is given (e.g., inventory is ordered every 10 days) along with the demand rate, lead time, and quantity on hand at order time. Use
This type of problem can be recognized when a probability distribution or empirical distribution for demand of a “perishable” item is given along with unit shortage and excess costs, or
Consider the jobs displayed in Table 11.14. Assume the shortest processing time is used to sequence the jobs.Table 11.14a. Which job is the fourth to be processed?b. What is the flow time of job F
Assume the jobs displayed in Table 11.16 need to be processed on a single resource and are sequenced with the WSPT rule.Table 11.16a. Which job would be processed second?b. What is the average flow
If the jobs displayed in Table 11.20 are processed using the earliest-due-date rule,Table 11.20a. What would be the lateness of job B?b. What would be the tardiness of job E?c. What is the maximum
Consider the dependency matrix and the activity durations provided above.a. Create a dependency matrix for the activities described, and build a project graph.b. Find the critical path. What is the
Flextrola, Inc., an electronics system integrator, is developing a new product. Solectrics can produce a key component for this product. Solectrics sells this component to Flextrola for $72 per unit
A manufacturing company producing medical devices reported $60,000,000 in sales over the last year. At the end of the same year, the company had $20,000,000 worth of inventory of ready-to-ship
A large catalog retailer of fashion apparel reported $100,000,000 in revenues over the last year. On average, over the same year, the company had $5,000,000 worth of inventory in its
LaVilla is a village in the Italian Alps. Given its enormous popularity among Swiss, German, Austrian, and Italian skiers, all of its beds are always booked in the winter season and there are, on
The following table shows financial data for Costco Wholesale and Walmart, two major U.S. retailers.Assume that both companies have an average annual holding cost rate of 30 percent (i.e., it costs
The following figures are taken from the financial statements of McDonald’s and Wendy’s.Figures are in million dollars.a. What were McDonald’s inventory turns in this year? What were Wendy’s
The following provides financial information for Kroger (in million $):What were Kroger’s inventory turns in this year? Inventory Revenue Cost of goods sold Kroger $6,244 $ 95,751 $76,858
Consider a process consisting of three resources:What is the bottleneck? What is the process capacity? What is the flow rate if demand is eight units per hour? What is the utilization of each
Consider the following two-step process:Step A has a processing time of 1 minute per unit, but no setup is required. Step B has a processing time of 0.1 minute per unit, but a setup time of 9 minutes
Consider the following batch-flow process consisting of three process steps performed by three machines:Work is processed in batches at each step. Before a batch is processed at step 1, the machine
John is a newly minted quality engineer at MakeStuff Inc. His boss, intending to promote higher quality in the company, tells him to increase the process capability index of their main product. John
A company making tires for bikes is concerned about the exact width of their cyclocross tires. The company has a lower specification limit of 22.8 mm and an upper specification limit of 23.2 mm. The
Once the raw materials are collected, a single flow unit manufacturing process comprises three sequential steps:Step 1 consumes large amounts of an expensive paint Step 2 is the bottleneck Step 3 has
Consider a worker-paced line with three process steps, each of which is staffed with one worker.The sequence of the three steps does not matter for the completion of the product. Currently, the three
Describe the conditions under which MRP is most appropriate.
Describe the inputs, outputs, and nature of MRP processing.
Explain how requirements in a master production schedule are translated into material requirements for lower-level items.
Discuss the benefits and requirements of MRP.
Describe some of the difficulties users have encountered with MRP.
Describe MRP II and its benefits.
Explain how an MRP system is useful in capacity requirements planning.
Describe ERP, what it provides, and its hidden costs.
Explain the terms lean operations and JIT.
Describe the main characteristics of lean systems.
List the five principles of how lean systems function.
List some of the benefits and some of the risks of lean operation.
Describe the Toyota Production System (TPS).
List the three goals of a lean system and explain the importance of each.
List the eight wastes according to lean philosophy.
Identify and briefly discuss the four building blocks of a lean production system.
Describe key lean improvement tools.
Outline considerations for successful conversion from a traditional system to a lean system.
Describe some of the obstacles to lean success.
Determine the number of containers needed for a workstation that uses 100 parts per hour if the time for a container to complete a cycle (move, wait, empty, return, fill) is 90 minutes and a standard
Determine the number of cycles per day and the production quantity per cycle for this set of products. The department operates five days a week. Assume the sequence A-B-C-D will be used. Product A B
Explain the terms supply chain and logistics.
List and briefly explain current trends in supply chain management.
Outline the benefits and risks related to outsourcing.
Explain what the main supply chain risks are and what businesses can do to minimize those risks.
Describe some of the complexities related to global supply chains.
Briefly describe ethical issues in supply chains and the key steps companies can take to avoid ethical problems.
Describe the three concerns of small businesses related to the supply chain and suggest ways to manage those concerns.
List several strategic, tactical, and operational responsibilities related to managing the supply chain.
Discuss procurement in terms of the purchasing interfaces, the purchasing cycle, ethics, and centralized versus decentralized decision making.
Briefly describe the key aspects of supplier management.
Discuss the logistics aspects of supply chain management, including RFID technology.
Discuss the issues involved in managing returns.
Describe some of the challenges in creating an effective supply chain and some of the trade-offs involved.
What are some of the advantages of e-business?
Explain the benefit of cross-docking.
Explain what scheduling involves and the importance of good scheduling.
Compare product and service scheduling hierarchies.
Describe scheduling needs in high-volume systems.
Describe scheduling needs in intermediate-volume systems.
Describe scheduling needs in job shops.
Use and interpret Gantt charts.
Use the assignment method for loading.
Give examples of commonly used priority rules.
Discuss the theory of constraints and that approach to scheduling.
Summarize some of the unique problems encountered in service systems, and describe some of the approaches used for scheduling service systems.
Job times (including processing and setup) are shown in the following table for five jobs waiting to be processed at a work center.Determine the processing sequence that would result from each of
Using the following information, determine an order processing sequence using the S/O priority rule. Order A ABCD B D Processing Time Remaining (days) 20 11 10 16 Due Date (days) 30 18 6 23 Number of
Describe the project life cycle.
Discuss the behavioral aspects of projects in terms of project personnel and the project manager.
Name the six key decisions in project management.
Explain the nature and importance of a work breakdown structure in project management.
Construct simple network diagrams.
Analyze networks with deterministic times.
Analyze networks with probabilistic times.
Describe activity “crashing” and solve typical problems.
Discuss the advantages of using PERT and potential sources of error.
What imbalance does the existence of a waiting line reveal?
What causes waiting lines to form, and why is it impossible to eliminate them completely?
What metrics are used to help managers analyze waiting lines?
What very important lesson does the constant service time model provide for managers?
One of the features of a new machine shop will be a well-stocked tool crib. The manager of the shop must decide on the number of attendants needed to staff the crib. Attendants will receive $20.
The following is a list of service times for three different operations.a. Determine the service rate for each operation.b. Would the calculated rates be different if these were interarrival times
A group of 10 machines is loaded and unloaded by one of three servers. The machines run for an average of six minutes per cycle, and average time to unload and reload is nine minutes.Each time can be
Describe the type of problem that would lend itself to a solution using linear programming.
Formulate a linear programming model from a description of a problem.
Solve simple linear programming problems using the graphical method.
Interpret computer solutions of linear programming problems.
Do sensitivity analysis on the solution to a linear programming problem.
A small construction firm specializes in building and selling single-family homes. The firm offers two basic types of houses: model A and model B. Model A houses require 4,000 labor hours, 2 tons of

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