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Practical Operations Management 2nd Edition Natalie Simpson - Solutions
An item arrives for processing at an average rate of 100 items an hour (\), where each item spends an average of 30 minutes (W) being processed. On average, how many items are in the processing system?
One common illustration used to demonstrate the philosophy of just-in-time inven- tory management shows a lake in which sharp rocks are hiding beneath the water's surface. What do the rocks represent?
One common illustration used to demonstrate the philosophy of just-in-time inven- tory management shows a lake in which sharp rocks are hiding beneath the water's surface. What does the water represent? Why should the lake be drained?
The usage rate of a component is 600 an hour, the lead time on a container of the com- ponent is 30 minutes, and each container holds 110 components. Assuming a policy variable of 10%, how many kanban cards should be used to control production?
A kanban system has just been introduced into a machine shop to control the pro- duction of a common part used by many different subassemblies at many different workstations. The kanban system has been operating for 2 weeks, but workers have made many complaints about it. Apparently workers who
Three kanban cards are hanging on a board next to a work area, while another identical kanban card is attached to the container that an employee is busy filling with parts created in that work area. Five more matching kanban cards are already attached to full containers placed in a convenient
The Belmont Company must produce 1,500 boxes of product A each year, 2,000 boxes of product B each year, and 500 boxes of product C each year. The Belmont Company works 250 days a year, and it can make a total of 16 boxes of product a day (any mix of the products A, B, and C). In the past, Belmont
The fabrication department provides a component for the assembly department. The assembly department's usage of the component is 4,800 units per 8-hour day. The fabrication department fills each container with 60 units in 40 minutes. Man- agement has built a 20% cushion into the system.a. How many
Darden Company uses a kanban loop to control SKU #303, which is produced on stamping machines. They have six kanban cards circulating in the loop. Next month Darden will replace its stamping machines with a newer technology that can pro- duce SKU #303 at twice the speed of the current machines.
The Fine Crate Company has several machines that cut wooden planks used for building storage pallets and automatically load them into rolling bins for trans- portation and handling. Each bin holds 100 planks and each machine cuts and loads the planks into bins at a rate of 250 planks per hour. A
Tartan Technologies insists on planning on a weekly basis, as they produce 50 weeks out of the year. Tartan Technologies produces three finished goods: the economical model A, the midrange model B, and the deluxe model C. Next year Tartan will produce 500 model Cs, 1000 model Bs, and 2000 model As
Rothera Point Utilities operates Rothera Point Power Plant, a coal-fired generation facility that operates continuously, provid- ing electricity to nearly 700,000 households in its service area. Rothera Point Plant consumes coal at a steady rate of 350 tons an hour, supplied through a contract with
Which represents the greatest threat to the success of an operation, the producer's or the consumer's risk?
What types of operations exhibit the greatest natural variation in their output? How useful is statistical process control to these operations?
If the Central Limit Theorem were to suddenly become invalid, how would the cur- rent use of control charts then be misguided?
Suppose the range within a sample was calculated and then plotted on an R-chart, but this sample range fell outside the lower control limit on the R-chart. Does this necessarily represent defective production?
Why would a consumer tolerate a certain amount of defectiveness in a product? When is this more common?
A production process that exhibits only natural variation would be considered what?
Another term or description for natural variation is what?
If a point plotted on a control chart falls outside one of the control limits, what does this suggest?
Producer's risk refers to what potential mistake?
To what potential mistake does consumer's risk refer?
Will the variation in sample means be greater or less than the variation in the process being sampled?
A process capability index value greater than 1.0 indicates what?
Will widening the distance between the control limits on a mean chart increase or decrease producer's risk?
How does decreasing the sample size influence the producer's risk in acceptance sampling?
Theoretically, how does an increasing proportion of defects in incoming product influence the probability of accepting a batch?
Do larger sample sizes lead to narrower or wider control limits on a process?
Do larger sample sizes increase or decrease consumer's risk?
Five cans are measured from the recent output of a high-speed bottling line. The weights of each of these cans are 12.23, 12.55, 12.01, 12.26, and 12.17 ounces. What is the mean weight of this sample of five cans?
Five cans are measured from the recent output of a high-speed bottling line. The weights of each of these cans are 12.23, 12.55, 12.01, 12.26, and 12.17 ounces. What is the range in this sample of five cans?
Samples of five cans are to be selected periodically from a canning process that has a standard deviation (o) of 0.2 ounces when in control. What will the standard devia- tion in the sampling distribution be?
A certain product can weigh no more than 1.001 and no less than 0.998 ounces by design. A machine being considered to produce this product has natural standard deviation of 0.0004 ounces in its output. What is the process capability index for this use of the machine?
Thirty samples of 16 cans each are measured from a canning process while it is in control. The mean of the 30 sample means is 12.03 ounces and the average range is 0.04 ounces. What should the upper and lower control limits be on a mean chart to monitor this canning process in the future?
Thirty samples of 16 cans each are measured from a canning process while it is in control. The mean of the 30 sample means is 12.03 ounces and the average range is 0.04 ounces. What should the upper and lower control limits be on a range chart to monitor this canning process in the future?
The average proportion defective is known to be 1%. What should the upper and lower control limits of a p-chart be if n = 25 and z = 3.0?
The average number of defects is 35 per day. What should the upper and lower control limits of a c-chart be if z = 3.0?
If a sampling plan used a sample size of n = 100 for batches of N = 1,000 units with a 58.3% chance of accepting batches that have an actual proportion defective of p = 10%, what AOQ would result from this plan?
Suppose a manager must construct either a mean chart with known variation or a p-chart to monitor some process. When the process is in control, the manager wants only 0.6% of the samples taken to fall outside these limits. What z-value should be used when calculating the limits for this chart?
Suppose a manager must construct either a mean chart with known variation or a p-chart to monitor some process. When the process is in control, the manager wants only 12.6% of the samples taken to fall outside these limits. What z-value should be used when calculating the limits for this chart?
Samples of five cans are to be selected periodically from a canning process that has a variance (o) of 0.2 ounces when in control. What will the standard deviation in the sampling distribution be?
A certain product can weigh no more than 1.001 and no less than 0.998 ounces by design. What is the maximum natural variation a process can have to be considered capable of supporting these design specifications?
Suppose a manager must construct either a mean chart with known variation or a p-chart to monitor some process. When the process is in control, the manager wants only 1.92% of the samples taken to fall outside these limits. What z-value should the manager use when calculating the limits for this
An office supply company manufactures paper clips, and even tolerates a small proportion of those paper clips being defective (incorrectly shaped and/or twisted) in its outgoing product. (The company reasons that paper clips are so cheap, users will simply discard the occasional defective paper
A beverage company would like to use a mean chart to monitor how much liq- uid beverage it puts into each 500-ml bottle. They know from past experience that whenever this process is under control, bottle weight is normally distributed with a mean of 500 ml and a standard deviation of 2 ml. The
A large beverage company would like to use statistical process control to monitor a new bottling machine designed to load liquid into 350-ml bottles. This company knows that the exact amount the machine places in each bottle can naturally vary by a small amount, but does not have any more specific
A manager wants to monitor the proportion of red candies present in a five-color candy mix. For 8 hours, the manager has gathered exactly 50 candies every hour, by randomly selecting and emptying one 50-candy bag produced by the the candy mix packaging machine. During this 8-hour shift, the manager
You are visiting the Engineering Office of Denton Hospital, as part of a consulting project. You notice some charts on one wall which look familiar to you:One of the employees notices you reading the charts and explains, "The primary patient care area, Denton Tower, has over 1,000 individual rooms
VitaComp manufactures nonpharmaceutical pills and pellets from dry ingredients, using a collection of machinery it maintains in a large job shop. Machine AA-23 molds circular pellets to an average diameter of 65 mm, with normally distributed natural variation expressed by a 1 mm standard deviation
Vigilance Inc. provides secret shopping services to assist other companies in quality control. Vigilance has just been awarded a contract by Freshway Supermarkets to monitor the customer service experience at all its stores. To gather baseline data, Vigilance sent secret shoppers to pose as custom-
How could bottleneck management's recommendations concerning the distinction between activation and utilization relate to personal time management?
How can work be urgent without being important?
Consider an incentive system that simply rewards production output. How can this system hurt an organization with a distinct bottleneck operation? What part of the organization will be hurt the most?
A major advantage of using SPT is the minimization of average flowtime. What is a disadvantage of the use of SPT?
Give an example in which more than one priority rule is used simultaneously to create a sequence.
The total amount of time required to complete a schedule is called what?
Line balancing is a technique for scheduling for a system that produces at what level of volume?
Do deadlines determine the timing in forward or backward scheduling?
Critical ratio is calculated as the time remaining divided by what?
What does using Johnson's rule to schedule two work centers minimize?
Does scheduling according to shortest processing time tend to minimize average flowtime or average tardiness?
Does scheduling according to earliest due date tend to minimize average flowtime or average tardiness?
If a job is finished 4 days early, what is its tardiness?
Dispatching involves the assigning of what?
Is recognizing capacity constraints when developing a schedule called finite or infi- nite loading?
The length of time a job spends in the system is referred to as what?
What priority sequencing rule is usually used to order customers standing in a line?
Job Alpha requires 2 weeks of work and is due in 4 weeks. What is the critical ratio for this job?
Job Alpha is due in 4 weeks. If the flowtime for this job is 2 weeks, what is this job's tardiness?
Job Alpha requires 2 weeks of work and job Beta requires 3 weeks of work. If job Alpha is completed first and job Beta is completed next, what is the flowtime for job Beta?
The flowtime of the last job in a single work center's schedule is 7 days. What is the makespan of this schedule?
Job Tango is due in 4 weeks. If the flowtime for this job is 6 weeks, what is this job's tardiness?
Job Victor requires 8 weeks of work and job Tango requires 2 weeks of work. If job Victor is completed first and job Tango is completed next, what is the tardiness for job Tango if it is due in 4 weeks?
All work orders at a bakery require prep and then baking. An order for a single birth- day cake requires the least amount of baking of all orders for the day. Assuming the bakery wishes to minimize the makespan of the daily schedule, when should that birthday cake be scheduled?
All work orders at a bakery require prep and then baking. An order for a batch of baked apples requires the least amount of prep of all orders for the day. Assuming the bakery wishes to minimize the makespan of the daily schedule, when should that batch of baked apples be scheduled?
Consider the following three jobs: Job Alpha requires 2 weeks of work and is due in 4 weeks. Job Beta requires 3 weeks of work and is due in 5 weeks. Job Carlos requires 1 week of work and is due in 3 weeks. If these jobs are completed in alpha- betical order, how late will job Beta be?
Consider the following three jobs: Job Alpha requires 2 weeks of work and is due in 4 weeks. Job Beta requires 3 weeks of work and is due in 5 weeks. Job Carlos requires 1 week of work and is due in 3 weeks. If these jobs are sequenced with SPT, how late will job Beta be?
Suppose you have three jobs waiting to be completed, and you must determine the sequence in which these jobs should be worked on. You calculated the critical ratio for each of the jobs and the results were that job A has a critical ratio of 1.27, job B has a critical ratio of -0.89, and job C has a
Suppose you have three jobs waiting to be completed, and you must determine the sequence in which these jobs should be worked on. You calculated the critical ratio for each of the jobs and the results were that job A has a critical ratio of 1.27, job B has a critical ratio of -0.89, and job C has a
Jack, the owner of Jack's Electronic Repair, currently has five jobs to be scheduled:a. If Jack uses SPT to schedule these jobs, what will be the average job tardiness?b. If Jack uses EDD to schedule these jobs, what is the flowtime of job A?c. If Jack uses EDD to schedule these jobs, when will job
Consider the following three jobs: Job Oscar requires 2 weeks of work and is due in 4 weeks. Job Lima requires 3 weeks of work and is due in 5 weeks. Job Denver requires 1 week of work and is due in 3 weeks.a. If these jobs are completed in alphabetical order, what is the tardiness associated with
The operations manager of a body and paint shop has five cars to schedule for repair. He would like to minimize the time needed to compete all work on these cars. Each car requires body work prior to painting. The estimates of the times required to do the body and paint work on each car are as
Pristine Aircraft Maintenance has received four Boeing 737 airplanes that require maintenance. Airplane SW-023 will require 4 days of hull inspection and 3 days of painting, Airplane DL-040 will require 1 day of hull inspection and 4 days of paint- ing, Airplane SA-009 will require 5 days of hull
The owner/operator of an in-home meal catering company has four jobs to deliver today, shown in the order in which they were received:a. Suppose the owner uses FCFS to schedule these jobs. How long, on average, will be required before each job is finished?b. If the owner uses SPT to schedule these
The table below contains information about five jobs waiting to be processed at stamping machine 307 in the MetalBright Job Shop.a. Which of these three rules provides the best sequence in terms of average flow- time: EDD, critical ratio, or SPT?b. Which of these three rules provides the best
Bronson Construction must complete six road repair projects before winter weather ends the construction season. In each case, Bronson has been hired to remove an old road in a process known as milling, and then replace that road with new pavement. How much time is required to mill and then pave a
Gourmet Food Support (GFS) is a commercial caterer that prepares salads, soups, and baked goods, primarily for sale through other restaurant kitchens. The bakery area of GFS is equipped with one high-capacity oven used for all baked items, which are prepared early in the morning for distribution
Recall from Chapter 4 that Tiger Stripe Copy Center is a small business located near a large university campus. Tiger Stripe Copy offers a range of services to walk-in customers, including passport photos, self-service copy machines, pack- aging and shipping, and the sale of course packs. Course
A car rental agency uses 96 boxes of staples a year. The boxes cost \($4\) each. It costs \($10\) to order staples, and it costs \($0.80\) to hold a box of staples in inventory for 1 year. Using the order size that minimizes the car rental agency's combined order- ing and holding costs for staples,
A gift shop sells 2,000 musical greeting cards each year. The ordering cost for musi- cal greeting cards is \($100\) per order and the holding cost is \($10\) per musical greet- ing card per year. If the gift shop always orders 100 musical greeting cards when it places an order from its supplier,
Critical path methodology allows managers to focus on a group of tasks within a project. What is a potential disadvantage of this methodology?
How are projects and customized products related?
It is said that a delay in critical path activity will delay the project, while a delay in a noncritical path activity will not necessarily delay the project. Explain the need to specify not necessarily."
Would a project with 100 tasks always be more challenging to manage than a differ- ent project with only 20 tasks? Why or why not?
What are the likely consequences to managing a highly uncertain project in the predictive style of project management?
Why does a project necessarily have to possess some form of deadline? What is the implication of a project without a deadline?
Is the critical path the shortest or longest path through a project network?
If task A is an immediate predecessor of task B, what must be true about the sched- uled timing of these two tasks?
What is the total amount of slack in all critical path activities?
PERT assumes that individual task times can be modeled with what type of prob- ability distribution?
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