Practical Operations Management
2nd Edition
ISBN: 9781939297136
Author: Simpson
Publisher: HERCHER PUBLISHING,INCORPORATED
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Question
Chapter 14, Problem 8P
Summary Introduction
Interpretation: Tardiness of the job when it is accomplished 4 days early.
Concept Introduction:
In the
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Complete the table; find average lateness, average completion time, and average number of jobs in the system. Assume all durations are in days and that the jobs are processed at the shop in the order that they arrive (A then B then C then D). Today is day 1.
Job
Process Time
Flow Time
Due Date
Lateness
A
15
30
B
3
9
C
12
22
D
15
40
Sum (Average)
45 (11.25)
Avg. lateness = ? days
Avg. completion time = ?? days
Avg. number of jobs in the system = ? jobs
Processing times and due dates for five jobs are shown in the table below. Assume the jobs are processed using the earliest-due-date rule.
Job
A
B
C
D
E
Processing time (weeks)
2
0.7
1
4
1.3
Due time (weeks)
1
8
4
5
2
12. What would be the lateness of job B?
What would be the tardiness of job E?
14. What is the maximum tardiness for this set of jobs?
Note: Round your answer to 1 decimal place.
15. What is the average flow time for this set of jobs?
Note: Round your answer to the nearest whole number.
Given the jobs displayed in Table 18.17, if SPT is used to sequence the jobs, what is theflow time of job F (in minutes)?
Chapter 14 Solutions
Practical Operations Management
Ch. 14 - Prob. 1DQCh. 14 - Prob. 2DQCh. 14 - Prob. 3DQCh. 14 - Prob. 4DQCh. 14 - Prob. 5DQCh. 14 - Prob. 1PCh. 14 - Prob. 2PCh. 14 - Prob. 3PCh. 14 - Prob. 4PCh. 14 - Prob. 6P
Ch. 14 - Prob. 7PCh. 14 - Prob. 8PCh. 14 - Prob. 9PCh. 14 - Prob. 10PCh. 14 - Prob. 11PCh. 14 - Prob. 12PCh. 14 - Prob. 13PCh. 14 - Prob. 14PCh. 14 - Prob. 15PCh. 14 - Prob. 16PCh. 14 - Prob. 17PCh. 14 - Prob. 18PCh. 14 - Prob. 19PCh. 14 - Prob. 20PCh. 14 - Prob. 21PCh. 14 - Prob. 22PCh. 14 - Prob. 23PCh. 14 - Prob. 24PCh. 14 - Prob. 25PCh. 14 - Prob. 26PCh. 14 - Prob. 27PCh. 14 - Prob. 28PCh. 14 - Prob. 29PCh. 14 - Prob. 30PCh. 14 - Prob. 1.1QCh. 14 - Prob. 1.2QCh. 14 - Prob. 1.3QCh. 14 - Prob. 1.4Q
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, operations-management and related others by exploring similar questions and additional content below.Similar questions
- Which job sequence would be used if ordered using the rule "Shortest Job First"? Group of answer choices a. 1,2,3,4 b. 4,3,1,2 c. 2,1,3,4 d. 2,3,4,1 e. 2,3,1,4arrow_forwardHow does Priority Scheduling compare to Shortest Job First Scheduling?arrow_forwardGiven the projects displayed in Table 18.21, if SPT is used to sequence the jobs, what isthe average inventory of the projects (in projects)?arrow_forward
- Given the projects displayed in Table 18.21, if SPT is used to sequence the jobs, what isthe average flow time of the projects (in hours)?arrow_forwardGiven the jobs displayed in Table 18.17, if SPT is used to sequence the jobs, what is theaverage flow time of jobs in the system?arrow_forwardI only need help with question 4, but question 3 explains how to do 4 but I'm lost. I already have question 3 done. 3. Sequence the jobs shown below by using a Gantt chart. Assume that the move time between machines is one hour. Sequence the jobs in priority order 1, 2, 3, 4. Job Work Center/Machine Hours Due Date (days) Job 1 A/3, B/2, C/2 Job 2 C/2, A/4 Job 3 B/6, A/1, C/3 Job 4 C/4, A/1, B/2 a. What is the makespan? b. How much machine idle time is there? c. When is each job delivered compared with its due date? d. How much idle time (waiting time) is there for each job? e. Devise a better job sequence for processing. 4. In problem 3, assume there are two machines of type A, two of type B, and two of type C. a. Prepare a finite capacity schedule. b. Compare the FCS to the Gantt chart in problem 3.arrow_forward
- Seven jobs are to be processed through a single machine. The processing times anddue dates are given here.Job 1 2 3 4 5 6 7Processing time 3 6 8 4 2 1 7Due date 4 8 12 15 11 25 21Determine the sequence of the jobs in order to minimizea. Mean flow time.b. Number of tardy jobs.c. Maximum lateness.d. What is the makespan for any sequence?arrow_forwardRon Satter field's excavation company uses bothGantt scheduling charts and Gantt load charts.a) Today, which is the end of day 7, Ron is reviewing the Ganttchart depicting these schedules:• Job # 151 was scheduled to begin on day 3 and to ta ke6 days. As of now, it is I day ahead of schedule.• Job# 177 was scheduled to begin on day J and take 4 days.It is currently on time.• Job #1 79 was scheduled to start on day 7 and take 2 days. Itactually got started on day 6 and is progressing according toplan.• Job #211 was scheduled to begin on day 5, but missingequipment delayed it until day 6. It is progressing asexpected and should take 3 days.• Job #215 was scheduled to begin on day 4 and take 5 days.It got sta rted on time but has since fallen behind 2 days.Draw the Gantt scheduling chart for the activities described.b) Ron now wants to use a Ga ntt load chart to see how muchwork is scheduled in each of his three work teams: Able,Baker, and Charlie. Five jobs constitute the current…arrow_forwardWhat is standard time amount?arrow_forward
- The following jobs are waiting to be processed at a small machine center: AU dates are specified as manufacturing planning calendar days.Assume that all jobs arrived on day 210 (yesterday) in the ordershown but are not scheduled to begin until day 211 (today).a) Sequence the jobs according to LPT.b) What is the average completion (flow) time?c) What is the average job la teness?d) What is the average number of jobs in the system?arrow_forwardWhat similarities between Priority Scheduling and Shortest Job First Scheduling exist, if any?arrow_forwardplease give me formulas 1. how to minimize tardiness of the 8 jobs? 2. Find a sequence to minimize the number of tardy jobs (jobs with tardiness > 0). note: please give formulas using excelarrow_forward
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