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operations management

Questions and Answers of Operations Management

A local tool and die shop has the following jobs to be processed. Today is day 120:Using the critical ratio rule, determine the sequence in which the jobs should be processed. Date Job Arrived
Explain the drum-buffer-rope concept.
An engine repair shop has the following jobs waiting to be processed. Jobs are listed in the order in which they arrived:1. Use the following sequencing rules to determine the order in which the jobs
What is the difference between a process batch and a transfer batch?
Shila Nathan, the hospital administrator for a hospital in Chennai, India, has to devise for the coming week a workforce schedule for nurses in the orthopedic department of the hospital. The daily
In what ways is scheduling for services different from scheduling in the manufacturing environment?
Use Johnson€™s Rule to obtain the optimum sequence of job processing for the following jobs through a two-machine flow shop. Each job must follow the sequence of job processing€”
What is yield management and what ethical issues does an organization have to deal with in using this scheduling strategy?
A local bakery makes custom cakes for special events such as weddings and graduation. Making cakes is a two-step process of baking and decorating. The bakery has received eight orders, and the times
What is supply chain scheduling, and what are its key features and benefits?
A publisher has eight book manuscripts to be processed through two operations in the following order: printing first and then binding. Processing times in hours for these two operations for each of
Describe some of the sustainability and ethical issues that organizations have to contend with in making scheduling decisions.
A machine shop has seven jobs to be processed through two work centers in the following order: milling and then grinding. The start and finish times in hours for each job for each operation are given
A local painting firm has contracted five interior house painting jobs. The extent of work involved will vary as the houses are of different sizes, have different painting requirements, and are in
Amy Campbell, the manager of a restaurant in Istanbul, Turkey, needs help scheduling her wait staff for next week. The amount of wait staff needed for each day of the week is given in the following
Mary Dexter needs help scheduling volunteers working at a soup kitchen in Chicago. Develop a schedule that will meet the demand requirement with the constraint that each volunteer will work only four
Use the assignment method to determine the optimum assignment of workers to jobs, given the following profit information. Compute the total profit of this assignment: Jobs (in U.S. dollars) 2 Workers
Given the following data on planned and actual inputs and outputs of an automobile service center in terms of standard hours of work, determine the cumulative deviation and the backlog for each
Shyam Nathan, a hospital administrator, needs help scheduling the nurses of his hospital for next week. The amount of nurses needed for each day of the week is given in the following table:1. Help
A machine shop has seven jobs to be processed through a two-step process. The processing times in hours for each job for each operation are given in the following table. Determine the job sequence
Virender Sehwag, the manager of a homeless shelter, wants to develop a staffing schedule for volunteers working at the shelter given the following requirements. Determine a volunteer schedule with
Sunil Roberts, the manager of a restaurant, wants to develop a staffing schedule given the following employee requirements. Determine an employee schedule with the minimum number of employees needed
A service center has the planned and actual inputs and outputs (in standard hours of work) shown in the following table. Given a beginning backlog of 13 standard hours of work, compute the actual
Given the following processing times and due dates for six jobs, determine the optimum sequence using the following rules: FCFS, SPT, EDD, and CR. Due Date (in hours) Processing Time (in hours) Job
Another machine shop has five jobs to be processed through three operations: lathing, grinding, and drilling. The hours required to process these jobs for each of the three operations are shown in
Solve the following linear programming problem using the graphical method:Maximize Profits = $8S + $12TSubject to2S + 4T ≤ 1610S + 8T ≤ 40S, T ≥ 0
1. Set up Ross’s challenge as a linear programming (LP) problem. Identify the critical decision variables, objective function, and constraints.2. What is the optimal combination of drinks that Ross
State the conditions under which linear programming can be used as a decision making tool.
Consider the following linear programming model:Maximize Profits = $6X + $5YSubject to3X + 2Y ≤ 24 (hours of fabrication time)2X + 4Y ≤ 40 (hours of assembly time)X, Y ≥ 01. What are the
What does the term “linear” refer to in linear programming?
Solve the following linear programming problem using the graphical method:Minimize Costs = 4X1 + 6X2Subject to8X1 + 4X2 ≥ 40 (ounces of ingredient A)4X1 + 12X2 ≥ 36 (ounces of ingredient B)2X1 +
How is the feasible solution region defined on the graph of a linear programming model?
Consider the following linear programming model:Minimize Costs = $2P + $3RSubject to2.5P + 4R ≥ 100 (units of calcium)7.5P + 3R ≥ 120 (units of calories)2P + 6R ≥ 90 (units of protein)R ≥ 5
Discuss briefly the steps involved in formulating a linear programming model.
Elixir Juice Company produces four types of juice cocktails: mango juice, orange juice, pine apple juice, and a mixed fruit juice. Elixir Juice receives the required ingredients to make these juice
Refer to Example A.3.1. Solve this product mixture problem using Excel Solver. What are the optimum solution values?2. Interpret the €œallowable increase€ and
What are the steps to be followed in the graphical method of solving linear programming problems?
Refer to Example A.4.1. Solve this blending problem using Excel Solver. What are the optimum solution values?2. Interpret the €œallowable increase€ and €œallowable
What are the limitations of the graphical method of solving linear programming problems?
Refer to Example A.5.1. Solve this personnel scheduling problem using Excel Solver. What are the optimum solution values?2. Interpret the €œallowable increase€ and
What do iso-profit and iso-cost lines refer to in the graphical approach to solving linear programming problems?
Kiran More, a farmer in India, has 20 acres of farming land to grow wheat and rice. Kiran has a limited amount of money and can spend only $3,200 to plant the crops. The cost of planting an acre of
What does moving the objective function line to the boundaries of the feasible solution space mean in a maximization linear programming problem?
A copper extraction company in South Africa extracts copper from two sources: P and N. For optimum capacity utilization, the extraction company’s plant should process at least four tons of copper
What does the term shadow price mean in the linear programming sensitivity analysis output obtained using Excel Solver?
A fertilizer manufacturer has orders for 900 tons of a certain fertilizer from Chicago, Illinois, and 600 tons from Omaha, Nebraska. The company has 1,050 tons of this fertilizer in a warehouse in
What do the terms allowable increase and allowable decrease refer to in the linear programming sensitivity analysis output obtained using Excel Solver?
What are some possible effects that adding an additional constraint can have on the feasible solution space and the optimal values of a linear programming solution?
A cattle rancher in Australia wants to determine a least-cost diet to feed the cattle on his ranch. The diet, however, must contain certain minimum amounts of the following four essential nutrients:
A furniture manufacturer produces high-quality end tables and chairs using mahogany wood. An end table produced by the furniture manufacturer yields a profit of $15 per table, and each chair yields a
Duke Manufacturing produces both baseballs and cricket balls on a weekly basis. The resources needed to produce baseballs and cricket balls are leather, cutting, and dyeing time, as well as sewing
A gold mining company extracts gold from mine A and mine B. Both mines produce three grades of gold: high, medium, and low. The cost to mine a ton of gold from mine A is $300, and from mine B, it is
Deluxe Chemicals produces two types of photo developing chemicals—D78 and R45. The cost to produce D78 is $2, and for R45, it is $1. Based on next month’s forecasts of demand for these chemicals,
Karen Stanley, the fictional superintendent of education of Erie County, Pennsylvania, has the responsibility of assigning students to three high schools in her county and to provide bus
Asean Aromatics, a manufacturer of perfumes and aromatic oils in India, has three manufacturing plants in Trichy, Vijayawada, and Mysore, and warehouses in Chennai, Cochin, and Vizag. The following
Filbeck Investments manages the money invested by several wealthy clients. The company tailors its investment strategy based on the client’s risk tolerance and desire for the return on investment.
Tasty Eateries is a restaurant that is open 24 hours a day. Restaurant employees report for work at 2 a.m., 6 a.m., 10 a.m., 2 p.m., 6 p.m., and 10 p.m. The employees work on eight-hour shifts, and
You are a supply chain expert hired by Tru-Blade to help its managers make this location decision. For the alternative plant locations, determine the shipping patterns that will minimize total
For the following transportation problem, use the northwest corner rule to find an initial feasible solution and then the stepping stone method to find an optimum solution: To A Capacity From $5 $7
What are the three pieces of information required to formulate a transportation model?
For the following transportation problem, use the matrix least cost method to find an initial feasible solution and then the stepping stone method to find an optimum solution: To Capacity A. From $3
What are the five major assumptions required for transportation modeling?
For the following transportation problem, use the northwest corner rule to find an initial feasible solution and then the stepping stone method to find an optimum solution: To Capacity A From $4 $4
What is the difference between a balanced and an unbalanced transportation problem?
An electronics company has manufacturing plants at locations A, B, and C. The company ships a computer component manufactured in these plants to warehouses at locations X, Y, and Z. Unit shipping
List the four “steps” of the northwest corner rule.
J & K Timber Supply Company ships oak flooring from three of its mills in Jodhpur, Bhopal, and Nagpur to three warehouses in Chennai, New Delhi, and Chandigarh. Shipping costs in $ per ton, mill
List the four “steps” of the matrix least cost method.
A trucking company has to move 120 tons of concrete from three supply sources (A, B, and C) to three road construction project sites (X, Y, and Z). Shipping costs in $ per truck load, supply
Why does the matrix least cost method gives a better initial solution than the northwest corner rule does?
The following transportation matrix provides an initial feasible solution to a transportation problem. Perform one iteration of the stepping stone method to find an improved solution. What is the
What is the implication of getting a negative value of improvement index for a closed path?
The following transportation matrix provides an initial feasible solution to a transportation problem. Perform one iteration of the stepping stone method to find an improved solution. What is the
For a balanced transportation problem, what are the two criteria for a nondegenerate optimum solution?
Refer to Example B.1. Reformulate the Orion Electronics Company transportation problem as a linear programming model.
What does the term degeneracy mean in the context of transportation modeling, and what problems does it create in applying the stepping stone method?
Refer to problem 5. Reformulate that transportation problem as a linear programming model.Data from problem 5J & K Timber Supply Company ships oak flooring from three of its mills in Jodhpur,
Cool Air Inc. currently manufactures room air conditioners in its Chicago and Baton Rouge plants. The company ships its air conditioners to three warehouses in Boston, Tucson, and Denver. As a result
In the stepping stone method, what is the rationale for placing alternate + and – signs around the closed path?
National Energy Inc. supplies natural gas to customers to three counties in Pennsylvania€”Erie, Franklin, and Venango. National Energy receives natural gas from three
Why do we create dummy supply sources or dummy demand destinations in transportation modeling problems?
Ranbaxy Chemicals produces a synthetic resin that is manufactured in two of the company€™s plants in Colorado Springs and Dayton. Four distributors from Buffalo, Atlanta, New Orleans, and
Pennington Hardwood Lumber Supplier has three lumber mills in San Jose, Dayton, and Boston that manufacture pre-cut hardwood. These pre-cut hardwood are shipped to building warehouses in Cleveland,
Refer to problem 14. Reformulate that transportation problem as a linear programming model.Data from problem 14Pennington Hardwood Lumber Supplier has three lumber mills in San Jose, Dayton, and
Neptune Enterprises manufactures central processing units (CPUs) for a line of personal computers. Currently, the CPUs are manufactured in three existing plants in Raleigh, Akron, and Cedar Rapids.
Consider the following transportation matrix that has an initial feasible solution obtained using the northwest corner rule. It is impossible to apply the stepping stone method to this matrix in its
The following transportation matrix provides a degenerate initial feasible solution to a transportation problem. Apply the necessary fix to overcome the degenerate condition, and perform one
You have been hired as a consultant by a refrigerator manufacturer to evaluate the freight costs of motors needed for assembly of the company€™s refrigerators. Relevant data on plant
Refer to problem 19. Reformulate that transportation problem as a linear programming model.Data from problem 19You have been hired as a consultant by a refrigerator manufacturer to evaluate the
List some reasons why waiting lines occur.
A grocery store in a small town has a single check-out counter to service its customers. Customers wait in a single line at the checkout counter and are served on a first-come, first-served basis. On
1. What does this case suggest about the way in which operations and queuing models must also address the psychology of waiting lines in formulating methods for minimizing wait?2. Think of a long
The Canara Bank drive-in teller window can serve a customer at an average of 4 minutes per customer. Service time has a negative exponential distribution. Customers arrive in their cars at a rate
Define in your own words “Little’s Law.” Why is it applicable to a wide variety of queuing systems?
A local department of motor vehicles has an automated photographic machine that imprints the photographic image on to the license card including the lamination of the complete card. Drivers arrive at
What are some of the undesirable consequences of a waiting line?
The student recreation center of a state university has only one coffee shop. Students arrive at the coffees shop at an average rate of 35 per hour according to a Poisson distribution. The only
For most waiting line systems, the first-come, first-served (FCFS) rule is the most frequent assumption of queue discipline. Give some examples of waiting line systems where this assumption would not
What are the cost implications of managing waiting lines?
List the four key features of a waiting line system.

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