Five jobs are waiting for processing through two work centers. Their processing time (in minutes) at each work centeris contained in the table below. Each job requires work center Alpha before work center Beta. According to Johnson'srule, which job should be scheduled first in the sequence?O A. VOB. UO C. ROD. SO E. TJobRSTAlpha2023502655Beta3435202675

Given-JobAlphaBeta R2034S2335T5020U2626V5575

Answered: Five jobs are waiting for processing…

Practical Management Science

6th Edition

ISBN:9781337406659

Author:WINSTON, Wayne L.

Publisher:WINSTON, Wayne L.

Chapter2: Introduction To Spreadsheet Modeling

Section: Chapter Questions

Problem 20P: Julie James is opening a lemonade stand. She believes the fixed cost per week of running the stand...

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24 The job that arrived first at a work center or machine will be processed first and completed. Which of the following priority rules does this statement represent? a first come, first served b shortest processing time c critical ratio d earliest due date
The following jobs are waiting to be processed at a small machine center; JOB 10 20 30 40 50 days (round your response to one decimal place). DUE DATE 260 254 260 265 275 days (round your response to one decimal place). DURATION (DAYS) All dates are specified as manufacturing planning calendar days. Assume that all jobs arrived on day 200 (yesterday) in the order shown but are not scheduled to begin until day 201 (today). a) Sequence the jobs according to LPT. According to the LPT rule, the sequence of jobs should be 50, 20, 10, 30, 40 b) What is the average completion (flow) time? The average completion (flow) time is c) What is the average job lateness? The average job lateness is d) What is the average number of jobs in the system? The average number of jobs in the system is jobs (round your response to one decimal place). 18 22 14 4 32
Consider the production process where there are three processes A, B, and C. The job first arrives at process A (single machine), then moves for process B (there are two machines) and then finally it reaches process C. The arrival rate is 10 jobs/hr. The service rate at process A is 12 jobs/hr, process B is 13jobs/hr and process C is 15 jobs/hr. The arrival is assumed to be poisson distributed while the processing times are exponentially distributed. Out of the arriving jobs for process B, 20% is rejected and sent back to process A for reprocessing and similarly, out of the arriving jobs at process C 10% are rejected and sent back to process B for reprocessing. a) Find the effective arrival rate at each of the processes. b) Find average time a job spends in queue in the system.
The following 5 overhaul jobs are waiting to be pro-cessed at Avianic’s Engine Repair Inc. These jobs were logged as they arrived. All dates are specified as planning calendar days.Assume that all jobs arrived on day 180; today’s date is 200.JOB DUE DATE REMAINING TIME (DAYS)103 214 10205 223 7309 217 11412 219 5517 217 15Using the critical ratio scheduling rule, in what sequence wouldthe jobs be processed?
Five jobs are planned to be scheduled. Each of the jobs must be processed on three machines (A, B, and C) in the same order. The processing times are listed below. Use Johnson's Rule to determine the optimal sequence of jobs. Job B 16 10 11 10 14 20 12 3 10 8 4 1 O a) 3-1-2-4-5 O b) Johnson's Rule is not an Optimal Technique O c) 1-2-3-4-5 O d) 5-4-3-1-2 O e) 5-4-3-2-1 O) 5-4-2-1-3 O e) 5-4-2-3-1 2345
For a single machine scheduling problem, what priority rule guarantees that the average (mean) flow time is minimized?
The scheduling rule which most reduces number of jobs in the system/work in process is generally: First Come, First Serve Shortest Processing Time Flowtime Dispatch Rule Earliest Due Date Earliest Release Date
The following jobs are waiting to be processed at a small machine center. JOB 10 20 30 40 50 DUE DATE 260 256 260 265 275 DURATION (DAYS) According to the LPT rule, the sequence of jobs should be 10, 50, 40, 20, 30 b) What is the average completion (flow) time? The average completion (flow) time is 62.8 days (round your response to one decimal place) c) What is the average job lateness? The average job lateness is 11.0 days (round your response to one decimal place). d) What is the average number of jobs in the system? The average number of jobs in the system is jobs (round your response to one decimal place). 28 12 8 18 22 D Points: 2 of 4 All dates are specified as manufacturing planning calendar days. Assume that all jobs arrived on day 200 (yesterday) in the order shown but are not scheduled to begin until day 201 (today). a) Sequence the jobs according to LPT
The 4M company has a lathe as the centerpiece of the plant's work. The jobs arrive according to a Poisson process with an average rate of 2 per day. The processing time of each job is exponentially distributed with an average of 1/ 4 day. Since the jobs are large, if they are not in process they are stored in a warehouse some distance from the machine. However, to save time in bringing them in, the production manager proposes to add space for 3 in-process jobs in addition to the one on the lathe (the rest will continue to be stored). With this proposal, what proportion of the time will the space next to the lathe be adequate for the waiting jobs? Calculate your answer using the formulas available.
Consider the following process at a pharmacy. Customers drop off their prescriptions either in the drive-through counter or in the front counter of the pharmacy. Customers can request that their prescription be filled immediately. In this case, they must wait between 15 minutes and one hour depending on the current workload. Most customers are not willing to wait that long, so they opt to nominate a pick-up time at a later point during the day. Generally, customers drop their prescriptions in the morning before going to work (or at lunchtime) and they come back to pick up the drugs after work, typically between 5pm and 6pm. When dropping their prescription, a technician asks the customer for the pick-up time and puts the prescription in a box labelled with the hour preceding the pick-up time. For example, if the customer asks to have the prescription be ready at 5pm, the technician will drop it in the box with the label 4pm (there is one box for each hour of the day). Every hour, one…
Three jobs are to be scheduled on two machines A and B. Assume that the jobs are processed in the sequence A-B (A has to finish the job before B can continue the job). The processing times are: Job A B 1 5 4 2 7 7 3 3 5 Draw a Gantt chart that shows the schedule corresponding to the sequence 1-2-3 of the jobs.
Which simple scheduling concept can be applied to help schedule workers for a service operation with changing staffing requirements throughout the day?

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