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business
production and operations management

Questions and Answers of Production And Operations Management

• • B.32 This is the slack time of year at JES, Inc. The firm would actually like to shut down the plant, but if it laid off its core employees, they would probably go to work for a
• • B.31 A tailor sews dresses and suits. For a suit the tailor uses 3 m2 of wool and 1 m2 of cotton. For a dress the tailor uses 2 m2 of wool and 2 m2 of cotton. The tailor has 80 m2 of cotton
• B.30 Solve the following LP problem graphically:Minimize cost = 4X1 + 5X2 Subject to: X1 + 2X2 Ú 80 3X1 + X2 Ú 75 X1, X2 Ú 0
• B.29 Consider Paul Jordan’s following LP formulation:Minimize cost = +1X1 + +2X2 Subject to: X1 + 3X2 Ú 90 8X1 + 2X2 Ú 160 3X1 + 2X2 Ú 120 X2 … 70a) Graphically illustrate the feasible
• B.28 The Sweet Smell Fertilizer Company markets bags of manure labeled “not less than 60 lb dry weight.” The packaged manure is a combination of compost and sewage wastes. To provide
• • B.27 Doug Turner Food Processors wishes to introduce a new brand of dog biscuits composed of chicken- and liverflavored biscuits that meet certain nutritional requirements.The liver-flavored
• B.26 Solve the following LP problem graphically:Minimize cost = 24X + 15Y Subject to: 7X + 11Y Ú 77 16X + 4Y Ú 80 X, Y Ú 0
• B.25 Solve the following linear program graphically:Minimize cost = X1 + X2 Subject to: 8X1 + 16X2 Ú 64 X1 Ú 0 X2 Ú 92(Note: X2 values can be negative in this problem.)
B.21 Andy’s Bicycle Company (ABC) has the hottest new product on the upscale toy market—boys’ and girls’ bikes in bright fashion colors, with oversize hubs and axles; shell design safety
• • B.19 Mamlouk Design is an Egyptian manufacturer of handmade silk rugs. The company manufactures rugs in two different sizes:1.5 * 2.5 meters and 2 * 3 meters. The manufacturing process
• B.17 The Outdoor Furniture Corporation manufactures two products, benches and picnic tables, for use in yards and parks.The firm has two main resources: its carpenters (labor force) and a supply
• B.15 Walter Wallace is trying to determine how many units each of two commercial multiline telephones to produce each day.One of these is the standard model; the other one is the deluxe model.
• • B.13 An online retailer wants to optimize its marketing portfolio budget to maximize its return on investment (ROI). The retailer has decided to allocate a AED 1,000,000 budget across three
• • B.11 Each coffee table produced by Kevin Watson Designers nets the firm a profit of $9. Each bookcase yields a $12 profit. Watson’s firm is small and its resources limited. During any given
• B.10 A craftsman named William Barnes builds two kinds of birdhouses, one for wrens and a second for bluebirds. Each wren birdhouse takes 4 hours of labor and 4 units of lumber.Each bluebird
• B.8 The Lifang Wu Corporation manufactures two models of industrial robots, the Alpha 1 and the Beta 2. The firm employs 5 technicians, working 160 hours each per month, on its assembly line.
• • B.7 Green Vehicle Inc. manufactures electric cars and small delivery trucks. It has just opened a new factory where the C1 car and the T1 truck can both be manufactured. To make either
• B.6 The Chris Beehner Company manufactures two lines of designer yard gates, called model A and model B. Every gate requires blending a certain amount of steel and zinc; the company has available
• B.5 The Attaran Corporation manufactures two electrical products: portable air conditioners and portable heaters.The assembly process for each is similar in that both require a certain amount of
• B.1 Formulate your own optimization (maximization)problem with three variables, one objective, and three constraints
Smith’s, a Niagara, New York, clothing manufacturer that produces men’s shirts and pajamas, has two primary resources available: sewing-machine time (in the sewing department)and cutting-machine
13. Why is it not advisable to round optimal solutions to nearest integer?
12. Where a constraint crosses the vertical or horizontal axis, the quantity is fairly obvious. How does one go about finding the quantity coordinates where two constraints cross, not at an axis?
11. Compare how the corner-point and iso-profit line methods work for solving graphical problems.
10. Explain how to use the iso-cost line in a graphical minimization problem.
9. Define shadow price (or dual value).
8. When introducing an additional constraint, what will happen to the solution of the optimization problem?
7. Why is the diet problem, in practice, applicable for animals but not particularly for people?
6. How does a minimizing problem differ from a maximizing problem?
5. Under what circumstances is the objective function more important than the constraints in an LP model?
4. A calculated optimal solution to a LP max problem is not always chosen. Explain why.
3. Define the feasible region of a graphical LP problem. What is a feasible solution?
2. What is a “corner point”? Explain why solutions to LP problems focus on corner points.
1. List at least four applications of LP problems.
Cohen Chemicals, Inc., produces two types of photo-developing fluids. The first, a black-and-white picture chemical, costs Cohen $2,500 per ton to produce. The second, a color photo chemical, costs
LO A.7 A decision tree is preferable to a decision table when:a) a number of sequential decisions are to be made.b) probabilities are available.c) the maximax criterion is used.d) the objective is to
LO A.6 On a decision tree, once the tree has been drawn and the payoffs and probabilities have been placed on the tree, the analysis (computing EMVs and selecting the best alternative):a) is done by
LO A.5 The most that a person should pay for perfect information is:a) the EVPI.b) the maximum EMV minus the minimum EMV.c) the minimum EMV.d) the maximum EMV.
LO A.3 If probabilities are available to the decision maker, then the decision-making environment is called:a) certainty.b) uncertainty.c) risk.d) none of the above.
LO A.2 In decision table terminology, a course of action or a strategy that may be chosen by a decision maker is called a(n):a) payoff.b) alternative.c) state of nature.d) all of the above.
LO A.1 On a decision tree, at each state-of-nature node:a) the alternative with the greatest EMV is selected.b) an EMV is calculated.c) all probabilities are added together.d) the branch with the
• • A.31 Chris Suit is an administrator for Lowell Hospital.She is trying to determine whether to build a large wing on the existing hospital, a small wing, or no wing at all. If the population
A.28 The Machine Shop is a retailer of tools for carpenters.Their top selling product is a revolutionary saw, which sells for€999. However, they are short on cash and try to hold the storage as
• • • A.27 A construction company wants to decide on whether to bid for a new project or not. If the company decides to bid, there is a KWD 10,000 cost associated with preparing the preliminary
• • A.26 The pharmaceutical company Neuronome is in late clinical phase of a new cancer treatment. However, their competitor Immunoneuron is also in the late clinical phase of a pharmaceutical
• • A.25 A large investment firm wants to decide on how to invest one million dollars. The board is considering three options:invest in stocks, invest in T-Bills, or do nothing. There are two
• A.24 Abdulla wants to decide on the best route to take for work from two possible routes: A and B. The time taken to work on each route depends on the traffic. If Abdulla takes route A, it will
• • A.23 A car manufacturer supplies brake pads from two main suppliers. Historical quality information indicates that for Supplier 1, there is a 65% probability that a given lot would contain 3%
• • • A.21 Al-Andalus retail store in Saudi Arabia wants to decide on whether to build a large or a small store in the city of Dammam.The expected net present value of the return per month of
• • A.12 Palmer Jam Company is a small manufacturer of several different jam products. One product is an organic jam that has no preservatives, sold to retail outlets. Susan Palmer must decide
• A.5 Howard Weiss, Inc., is considering building a sensitive new radiation scanning device. His managers believe that there is a probability of 0.4 that the ATR Co. will come out with a
Daily demand for cases of Tidy Bowl cleaner at Ravinder Nath’s Supermarket has always been 5, 6, or 7 cases. Develop a decision tree that illustrates her decision alternatives as to whether to
12. Why is a decision tree appropriate for making decisions under risk?
11. Describe a case where a decision tree will not be the optimal model for decisions.
10. Why are the maximax and maximin strategies considered to be optimistic and pessimistic, respectively?
9. Describe how and when making a decision tree will make you do the right decisions.
8. What is the expected value with perfect information(EVwPI)?
7. What is the expected value of perfect information (EVPI)?
6. Explain how decision trees might be used in several of the 10 OM decisions.
5. What is a decision tree?
4. Discuss the differences between decision making under certainty, under risk, and under uncertainty.
3. What is the equally likely decision model?
2. Give an example of a good decision you made that resulted in a bad outcome. Also give an example of a bad decision you made that had a good outcome. Why was each decision good or bad?
1. Identify the six steps in the decision process.
The Getz operations manager would like to calculate the maximum that he would pay for information—that is, the expected value of perfect information, or EVPI.APPROACH c Referring to Table A.3 in
Getz would like to find the EMV for each alternative.APPROACH c Getz Products’ operations manager believes that the probability of a favorable market is 0.6, and that of an unfavorable market is
Getz Products Company would like to apply each of these three approaches now.APPROACH c Given Getz’s decision table from Example A2, he determines the maximax, maximin, and equally likely decision
Getz Products now wishes to organize the following information into a table. With a favorable market, a large facility will give Getz Products a net profit of $200,000. If the market is unfavorable,
Getz Products Company is investigating the possibility of producing and marketing backyard storage sheds. Undertaking this project would require the construction of either a large or a small
Explain when to use each of the three types of decision-making environments
LO 17.5 The two main tactics for improving maintenance are _______ and _______.
LO 17.7 ______ maintenance partners operators with maintenance personnel to observe, check, adjust, clean, and notify.a) Partneringb) Operatorc) Breakdownd) Six Sigmae) Autonomous
LO 17.6 The appropriate maintenance policy is developed by balancing preventive maintenance costs with breakdown maintenance costs. The problem is that:a) preventive maintenance costs are very
LO 17.4 The process that involves monitoring equipment and facilities, and performing routine inspections and service to keep equipment and facilities reliable is known as:a) breakdown maintenance.b)
LO 17.3 What is the formula for the mean time between failures?a) Number of failures 4 Number of unit-hours of operating timeb) Number of unit-hours of operating time ÷ Number of failuresc) (Number
LO 17.2 The reliability of a system with n independent components equals:a) the sum of the individual reliabilities.b) the minimum reliability among all components.c) the maximum reliability among
LO 17.1 The two main tactics for improving reliability are _______ and _______.
3. Discuss the pros and cons of hiring multi-craft maintenance personnel.Frito-Lay, the multi-billion-dollar subsidiary of food and beverage giant PepsiCo, maintains 36 plants in the U.S. and
2. What are the advantages and disadvantages of giving more responsibility for machine maintenance to the operator?Frito-Lay, the multi-billion-dollar subsidiary of food and beverage giant PepsiCo,
1. What might be done to help take Frito-Lay to the next level of outstanding maintenance? Consider factors such as sophisticated software.Frito-Lay, the multi-billion-dollar subsidiary of food and
• 17.16 The credit card issuing process at Atlanta Bank’s VISA program consists of 10 steps performed in series by different bank employees. The average reliability of each employee is 98%. Use
• • 17.13 Rick Wing, salesperson for Wave Soldering Systems, Inc. (WSSI), has provided you with a proposal for improving the temperature control on your present machine. The machine uses a
• 17.11 How much would reliability improve if the medical control system shown in Problem 17.9 changed to the redundant parallel system shown in Problem 17.10?
• • 17.8 Merrill Kim Sharp has a system composed of three components in parallel. The components have the following reliabilities:R1 = 0.90, R2 = 0.95, R3 = 0.85 What is the reliability of the
• • 17.5 A manufacturer of disk drives for notebook computers wants an MTBF of at least 50,000 hours. Recent test results for 10 units were one failure at 10,000 hours, another at 25,000 hours,
• • 17.4 Robert Klassen Manufacturing, a medical equipment manufacturer, subjected 100 heart pacemakers to 5,000 hours of testing. Halfway through the testing, 5 pacemakers failed. What was the
• • 17.3 A new aircraft control system is being designed that must be 98% reliable. This system consists of three components in series. If all three of the components are to have the same level
• 17.2. A testing process at Boeing Aircraft has 400 components in series. The average reliability of each component is 99.5%. Use Figure 17.2 to find the overall reliability of the whole testing
• 17.1 The Beta II computer’s electronic processing unit contains 50 components in series. The average reliability of each component is 99.0%. Using Figure 17.2, determine the overall reliability
10. Will preventive maintenance eliminate all breakdowns?
9. During an argument as to the merits of preventive maintenance at Windsor Printers, the company owner asked, “Why fix it before it breaks?” How would you, as the director of maintenance,
8. What roles can computerized maintenance management systems play in the maintenance function?
7. How does machine design contribute to either increasing or alleviating the maintenance problem?
6. How can a manager evaluate the effectiveness of the maintenance function?
5. What is the trade-off between operator-performed maintenance versus supplier-performed maintenance?
4. How could simulation be a useful technique for maintenance problems?
3. Explain the notion of “infant mortality” in the context of product reliability.
2. How does one identify a candidate for preventive maintenance?
1. What is the objective of maintenance and reliability?
The National Bank is disturbed that its loan-application process has a reliability of only .713 (see Example 1) and would like to improve this situation.APPROACH c The bank decides to provide

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