Exam 17: Supplement J Operations Scheduling

The sum of scheduled receipts for all items and the on-hand inventories for all items is ________.

Table J.17 A company must take on seven new projects. Each project has a planning stage and a design stage, and the planning stage must be completed before the design stage can begin. Also, two project teams are available to work on these projects: Team 1 works only on planning stages of projects, and Team 2 works only on design stages of projects. The times to complete the project stage, in days, are shown in the following table. -Using the information in Table J.17 and Johnson's rule, how much idle time does Team 2 have from the start of the first project through completion of the seventh?

Table J.16 Five jobs are currently waiting to be processed. Each job has to go through Machine 1 first and then Machine 2 before it is completed. The processing times (in hours) for the five jobs on each machine are: -Use the information in Table J.16. What is the makespan through both machines if the SPT rule is used to determine the sequence at Machine 1 and the same sequence is also used at Machine 2?

________ is the total amount of time required to complete a group of jobs.

Table J.2 Stu Dent reviews the syllabi he received on the first day of class and pulls out his planner. He has seven major assignments that must be completed before the end of the semester. -Stu applies the critical ratio method to scheduling his assignments. Which assignment is the fourth one in his sequence?

Table J.12 The Feast Janice prepares a medley of pastas for her brother Tony. Each of the pastas must first be rolled and then formed (or in some cases stuffed) before cooking. The required time on each machine in minutes is indicated in the table. -Janice decides to minimize the average flow time of the pastas using Johnson's rule. How much idle time does the Roller/Former machine experience?

Acme has an overabundance of machinery available, but most of the workforce has called in sick after the local team's devastating loss on Monday Night Football. This scheduling problem is a labor-limited environment.

Operations scheduling involves assigning jobs to workstations or employees to jobs for specific time periods.

Table J.6 All of the following three jobs just arrived (end of hour 0) at Workstation A. They are the only ones waiting to be processed. -Use the information in Table J.6. What is the average flow time at Workstation A for the critical ratio rule?

Sequencing jobs does not affect tardiness, because processing times are unchanged with different sequences.

Table J.17 A company must take on seven new projects. Each project has a planning stage and a design stage, and the planning stage must be completed before the design stage can begin. Also, two project teams are available to work on these projects: Team 1 works only on planning stages of projects, and Team 2 works only on design stages of projects. The times to complete the project stage, in days, are shown in the following table. -Using the information in Table J.17 and Johnson's rule, what is the sequence of projects that minimizes makespan?

Lee Beedo, a hip bachelor in Edmond, has a date for Saturday night and finds himself without a thing to wear. Faced with the daunting task of doing enough laundry to fully accessorize during his night out, Lee has sorted his clothes into loads according to fabric and color. Based on his vast experience doing laundry, Lee knows how long each load will take in both the washer and the dryer. He glances at his watch; it is now 2:00 p.m. and he has to have the last load dry by 8:30 p.m. to be there in time. Help Lee develop a schedule that will enable him to make his date on time and depict that schedule using a Gantt chart. Can he make it and, if so, by how much?

Operations scheduling applies only to manufacturing, because services do not allow inventories.

Which one of the following rules tends to perform well with respect to percentage of jobs past due and variance of hours past due, but performs relatively poorly with respect to average flow time?

________ is a priority sequencing rule that specifies that the job that has the earliest due date is the next job to be processed.

Table J.11 Work center Q45 has four jobs that just arrived (the start of Day 1) to be processed, as shown in the following table. Assume the shop works eight hours per day. -Using the information in Table J.11 and the critical ratio rule, what is the flow time of job B?

Table J.17 A company must take on seven new projects. Each project has a planning stage and a design stage, and the planning stage must be completed before the design stage can begin. Also, two project teams are available to work on these projects: Team 1 works only on planning stages of projects, and Team 2 works only on design stages of projects. The times to complete the project stage, in days, are shown in the following table. -Using the information in Table J.17 and Johnson's rule, what is the makespan for these seven jobs?

Table J.10 A workstation has six jobs waiting to be processed. They arrived at the end of Day 0 and it is now the beginning of Day 1. It is now time zero. Times are expressed in terms of days. -Using the information in Table J.10 and the earliest due date (EDD) rule, what is the average flow time?

The fact that job shops routinely accept new orders at any time makes the scheduling environment dynamic.

Table J.9 There are three jobs available for processing at Workstation 1. They just arrived at Workstation 1, at the end of Day 0. -Using the information in Table J.9 and the critical ratio rule, what should be the sequence of jobs processed at Workstation 1?