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operations management 6th

Questions and Answers of Operations Management 6th

U.S. and international agencies provide policies and regulations to guide managers in product design, manufacturing/assembly, and disassembly/disposal. They include:a) U.N. Commission on
A manufacturer of precision machine parts produces round shafts for use in the construction of drill presses. The average diameter of a shaft is .56 inch. Inspection samples contain 6 shafts each.
Nocaf Drinks, Inc., a producer of decaffeinated coffee, bottles Nocaf. Each bottle should have a net weight of 4 ounces. The machine that fills the bottles with coffee is new, and the operations
Altman Distributors, Inc., fills catalog orders. Samples of size n = 100 orders have been taken each day over the past 6 weeks. The average defect rate was .05. Determine the upper and lower limits
Ettlie Engineering has a new catalyst injection system for your countertop production line. Your process engineering department has conducted experiments and determined that the mean is 8.01 grams
Airlines lose thousands of checked bags every day, and America South Airlines is no exception to the industry rule. Over the past 6 weeks, the number of bags “misplaced” on America South flights
If the mean of a particular sample is within control limits and the range of that sample is not within control limits:a) The process is in control, with only assignable causes of variation.b) The
The central limit theorem:a) Is the theoretical foundation of the c-chart.b) States that the average of assignable variations is zero.c) Allows managers to use the normal distribution as the basis
The type of chart used to control the central tendency of variables with continuous dimensions is:a) x̅-chart.b) R-chart.c) P-chart.d) C-chart.e) None of the above.
If parts in a sample are measured and the mean of the sample measurement is outside the control limits:a) The process is out of control, and the cause should be established.b) The process is in
Control charts for attributes are:a) P-charts.b) C-charts.c) R-charts.d) x̅-charts.e) Both a and b.
The ability of a process to meet design specifications is called:a) Taguchi.b) Process capability.c) Capability index.d) Acceptance sampling.e) Average outgoing quality.
The _______ risk is the probability that a lot will be rejected despite the quality level exceeding or meeting the _______.
Insert a dummy activity and event to correct the following AOA network: T 3 days 5 days 2 3 5
Calculate the critical path, project completion time T, and project variance σ2p, based on the following AON network information: ACTIVITY TIME VARIANCE ES EF LS LF SLACK A 2 0 2 0 2 0 B 3 0 3 1 4 1
To complete the wing assembly for an experimental aircraft, Jim Gilbert has laid out the seven major activities involved. These activities have been labeled A through G in the following table, which
Referring to Solved Problem 3.4, now Jim Gilbert would like to determine the critical path for the entire wing assembly project as well as the expected completion time for the total project. In
The following information has been computed from a project:Expected total project time = T = 62 weeksProject variance (σ2p) = 81What is the probability that the project will be completed 18 weeks
Determine the least cost of reducing the project completion date by 3 months based on the following information: Start A B E End
Which of the following statements regarding Gantt charts is true?a) Gantt charts give a timeline and precedence relationships for each activity of a project.b) Gantt charts use the four standard
Which of the following is true about AOA and AON networks?a) In AOA, arrows represent activities.b) In AON, nodes represent activities.c) Activities consume time and resources.d) Nodes are also
Slack time equals:a) ES + t. b) LS − ES.c) zero. d) EF − ES.
The critical path of a network is the:a) Shortest-time path through the network.b) Path with the fewest activities.c) Path with the most activities.d) Longest-time path through the network.
PERT analysis computes the variance of the total project completion time as:a) The sum of the variances of all activities in the project.b) The sum of the variances of all activities on the critical
The crash cost per period:a) Is the difference in costs divided by the difference in times (crash and normal).b) Is considered to be linear in the range between normal and crash.c) needs to be
Sales of hair dryers at the Walgreens stores in Youngstown, Ohio, over the past 4 months have been 100, 110, 120, and 130 units (with 130 being the most recent sales). Develop a moving-average
The following data come from regression line projections:Compute the MAD and MSE. PERIOD FORECAST VALUES ACTUAL VALUES 1 410 406 23 4 419 423 428 423 435 440
Room registrations in the Toronto Towers Plaza Hotel have been recorded for the past 9 years. To project future occupancy, management would like to determine the mathematical trend of guest
Much before the dairy cooperative movement took roots in the country, the trail to milk revolution was set ablaze by Babasaheb Chitale .The journey began in 1939, in the small town of Bhilwadi which
Productivity increases when:a) Inputs increase while outputs remain the same.b) Inputs decrease while outputs remain the same.c) Outputs decrease while inputs remain the same.d) Inputs and outputs
Services often:a) Are tangible.b) Are standardized.c) Are knowledge based.d) Are low in customer interaction.e) Have consistent product definition.
Productivity:a) Can use many factors as the numerator.b) Is the same thing as production.c) Increases at about 0.5% per year.d) Is dependent upon labor, management, and capital.e) Is the same thing
Single-factor productivity:a) Remains constant.b) Is never constant.c) Usually uses labor as a factor.d) Seldom uses labor as a factor.e) Uses management as a factor.
Multifactor productivity:a) Remains constant.b) Is never constant.c) Usually uses substitutes as common variables for the factors of production.d) Seldom uses labor as a factor.e) Always uses
Productivity increases each year in the U.S. are a result of three factors:a) Labor, capital, managementb) Engineering, labor, capitalc) Engineering, capital, quality controld) Engineering, labor,
The global tire industry continues to consolidate. Michelin buys Goodrich and Uniroyal and builds plants throughout the world. Bridgestone buys Firestone, expands its research budget, and focuses on
DeHoratius Electronics, Inc., is evaluating several options for sourcing a critical processor for its new modem. Three sources are being considered: Hi-Tech in Canada, Zia in Hong Kong, and Zaragoza
A mission statement is beneficial to an organization because it:a) Is a statement of the organization’s purpose.b) Provides a basis for the organization’s culture.c) Identifies important
The three strategic approaches to competitive advantage are ____, ____, and _____.
Core competencies are those strengths in a firm that include:a) Specialized skills.b) Unique production methods.c) Proprietary information/knowledge.d) Things a company does better than others.e) All
Evaluating outsourcing providers by comparing their weighted average scores involves:a) Factor-rating analysis.b) Cost-volume analysis.c) Transportation model analysis.d) Linear regression
A company that is organized across international boundaries, with decentralized authority and substantial autonomy at each business via subsidiaries, franchises, or joint ventures, has:a) A global
Art Binley has decided to look at his productivity from a multi factor (total factor productivity) perspective (refer to Solved Problem 1.1). To do so, he has determined his labor, capital, energy,
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.

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