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operations management

Questions and Answers of Operations Management

Excelsior Clay Works, a fictional manufacturer of a variety of high-quality glazed clay roof tiles in Kerala, India, has the following composite demand forecasts (in hundreds of units):Additional
Kate Russell, the plant manager of a furniture manufacturing company, is in the process of developing a sales and operations plan for the upcoming year. She has obtained a forecast of expected demand
Medaas Electronics is a fictional producer of laser printers. The company€™s production planner, Christian Medaas, has developed the following cost data (in U.S. dollars):Regular time cost:
Reagan Health Foods Inc. is a fictional producer of protein drinks. The company’s production planner has developed the following demand forecast (in cases) for the first 6 months of 2016: 3,500;
Montague Furniture Corporation is a fictional chair manufacturer located in Pampanga, Philippines. They make two types of rattan bamboo chairs€”Rocking Chair and Windsor Chair. Both chairs
A company€™s production planner for the company€™s popular product has developed the following demand forecast and the perunit regular time production cost information for the
A company that manufactures roofing materials for houses has the following demand forecasts for the next 4 weeks.The company€™s available capacities for labor and machines and their
What are the immediate inputs to the master scheduling process?
1. Enterprise training represents just one more example of the types of enterprise-wide initiatives companies use their ERP systems to support. Can you think of other types of enterprise wide
A work center has two machines and two operators. The work center operates on two shifts and each operator works one shift at 8 hours per shift. The efficiency and utilization rates of the two
Dickinson Sports Equipment Inc. is a mythical manufacturer of a variety of sports goods. The bill of materials for one of its popular products, a sidewalk skateboard, is made up of a fiberglass board
How can ERP contribute to sustainable business practices?
Given the following product structure tree, master production schedule, and routing and work standards information:1. Develop a load projection report for each of the five work stations.2. Balance
Refer to problem 8. You are the production planner at Dickinson Sports Equipment Inc. The lead times for assembling the skateboard and for assembling or acquiring the various subassemblies and
Given the following product structure tree, master production schedule, and routing and work standards information:1. Develop a load projection report for each of the three work stations.2. Balance
Describe the time phasing logic in MRP.
Refer to the following product structure tree. At the beginning of week 7, 100 units of P are to be assembled. Component S is ordered in lot sizes of 300 units, and one such order is scheduled to
Describe the process of MRP explosion.
Refer to problems 8 and 9. If the master schedule calls for 70 sidewalk skateboards to be assembled at the beginning of week 10, prepare a material requirements plan for all subassemblies and
Explain the pegging capability of the MRP system.
What are the key outputs from the MRP process?
Assembling a pair of scissors requires a straight blade assembly, a bent blade assembly, and a screw. Each straight blade assembly requires a straight blade and a straight blade grip. Each bent blade
What are the differences between a regenerative and a net-change MRP system?
Complete the MRP records for component K. Component K Low-Level Code: 1 Lead Time: 2 weeks Lot Size: 200 Week 2 3 5 7 8 9. Gross Requirements 55 75 80 120 65 50 70 40 35 Scheduled Requirements 200
What is the meaning of “nervousness” in an MRP system? Describe its impact and the mitigation approaches that can be taken.
Complete the MRP records for end-product P. Week ProductP Low-Level Code:0 Lead Time: 1 week Lot Size: 2-week fixed-period ordering 3 4. 9. 10 Gross Requirements Scheduled Requirements Projected
Describe briefly the different lot-sizing approaches used in MRP.
Component X has the following weekly demand requirements:The ordering cost for this item is $50/order and holding cost is $2/unit/week (in U.S. dollars). To develop a material requirements plan for
Discuss briefly the benefits and limitations of an MRP system.
Component K has the following weekly demand requirements:The ordering cost for this item is $100/order and holding cost is $1/unit/week (in U.S. dollars). To develop a material requirements plan for
Discuss the key features and advantages of an integrated MRP–JIT system.
Explain how MRP can be applied in the following service businesses: (a) A hospital and (b) Aircraft scheduling.
The following table is a partial master schedule:1. Complete the master schedule records. Show all calculations.2. Suppose a customer cancels an order of 60 units in week 3, what effect would it have
A finished product R is assembled from two units of S and two units of Q. Production of S requires two units of K, three units of L, and one unit of M. Q is produced from two units of X and three
Suppose you were in charge of your company’s MRP system and received a memo from the CEO stating the need to “search diligently” for ways to improve manufacturing sustainability. Explain how
Refer to problem 19. Using the information provided in that problem and the following data, prepare an MRP table for finished product R.The minimum production lot size for R is 60. Assume no
Refer to problem 19. Using the information provided in that problem and the following data, prepare an MRP table for subassembly Q.The lot size for Q is in multiples of 70.There are 140 units of Q on
Refer to the product structure tree and the following data:Based on this product structure tree and the data provided, develop a gross and net requirement plan for subassemblies C and D. C (1) E (1)
Refer to problem 22. Given the data and the product structure tree provided in that problem, develop a material requirements plan for all the nine items.Data form problem 22Refer to the product
Explain the scheduling technique used when multiple products have to be scheduled in a line process.
The following table provides information on planned and actual inputs and outputs of an automotive service center in terms of standard hours of work. The beginning backlog is 14 standard hours of
1. How can you use workforce scheduling methods to schedule the umpires this coming summer?2. Can you think of other situations where workforce scheduling can be applied in your life?Ross Davis is a
Why is job-shop scheduling considerably more complex?
Given the following data on planned and actual inputs and outputs of a machine shop in terms of standard hours of work, determine the cumulative deviation and the backlog for each period. The
What is input–output control, and why is it an important scheduling technique for job shops?
Given the following data on planned and actual inputs and outputs of work center 4 of a tool and die shop in terms of standard hours of work, determine the cumulative deviation and the backlog for
Describe Gantt charts and how they are useful in job shop scheduling.
An elite logistics company wants to determine the optimum assignment of its fleet of trucks to delivery routes. The objective is to minimize total cost. The cost data in hundreds of dollars for the
Virat Kohli, the hospital administrator at mythical Trinity Hospital, wants to assign nurses beginning a shift in the oncology ward of the hospital. The time required for patient care varies from one
Refer to problem 5. Two weeks after assigning the nurses, Virat Kohli of Trinity Hospital wanted to focus on the patient satisfaction with the care they received from the nurses. Accordingly, he
List the assumptions made in the use of the five priority rules.
Susan Inskeep is the plant manager of an electronic manufacturing plant. The plant€™s current product line has five electronic components that can be processed in five machines. The
Describe briefly the three criteria used to evaluate the performance of the priority rules.
The Chief of Police, Karen Stanley, of the Make Believe Police Department needs to assign five detective squads to five pending criminal cases. Karen wants to come up with an optimum assignment that
Explain when Johnson’s rule can be used as a scheduling technique.
What is finite capacity scheduling (FCS), and what are its features?
Ross Barber is a senior at Pennsylvania State University pursuing a dual degree in marketing and supply chain management. Ross is overwhelmed because he has several assignments to be completed in the
Explain how applying the principles of the theory of constraints can minimize the complexity of scheduling.
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

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