Practical Operations Management
2nd Edition
ISBN: 9781939297136
Author: Simpson
Publisher: HERCHER PUBLISHING,INCORPORATED
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Chapter 14, Problem 13P
Summary Introduction
Interpretation: Critical ratio for the job alpha which requires 2 weeks of work and is due in 4 weeks.
Concept Introduction:
Critica ratio refers to the rule that merges the issue of due date and processing time together into one single value used to settle through the waiting jobs. It is also considered as a dynamic priority rule, in which the value changes as time passes, hence, the
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What are the objectives of work center scheduling?
Ron Satterfield’s excavation company uses bothGantt scheduling charts and Gantt load charts.a) Today, which is the end of day 7, Ron is reviewing theGantt chart depicting these schedules:◆ Job #151 was scheduled to begin on day 3 and to take6 days. As of now, it is 1 day ahead of schedule.◆ Job #177 was scheduled to begin on day 1 and take4 days. It is currently on time.◆ Job #179 was scheduled to start on day 7 and take2 days. It actually got started on day 6 and is progressing according to plan.◆ Job #211 was scheduled to begin on day 5, but missing equipment delayed it until day 6. It is progressing asexpected and should take 3 days.◆ Job #215 was scheduled to begin on day 4 and take5 days. It got started on time but has since fallen behind2 days.Draw the Gantt scheduling chart for the activities above.b) Ron now wants to use a Gantt load chart to see how muchwork is scheduled in each of his three work teams: Able,Baker, and Charlie. Five jobs constitute the current workload for…
If the cycle time is 65.4 seconds and A is assigned as the first task in Workstation #1, what is the idle time after assigning task A?
Task
Task Time (seconds)
Tasks That Must Precede Other Tasks
Number of Following Tasks
A
28
-
7
B
13
-
8
C
35
B
7
D
11
A
6
E
20
C
6
F
6
D, E
5
G
23
F
3
H
25
F
2
I
37
G
1
J
11
G, H
1
K
27
I, J
0
Total
236
a. 26.9 minutes
b. 37.4 seconds
c. 28.5 seconds
d. 31.6 seconds
e. 57.6 seconds
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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- Given 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_forwardRelative to job-based scheduling, how does a finite load differ from an infinite load?arrow_forwardThe following table contains information regarding jobs that are to be scheduled through one machine: Job Processing Time (Days) Due date A 4 20 B 12 30 C 2 15 D 11 16 E 10 18 F 3 5 G 6 9 Qus 1: Find the FCFS Schedule? Qus 2: Find the SOT Schedule? Qus 3:Find the DDate Schedule? Qus 4: What are the mean flow time and average lateness for each of the schedule above? Qus 5: Which priority rule is appropriate for job scheduling? Justify your answer.arrow_forward
- In a few words, explain how to prevent a process getting starved in priority scheduling.arrow_forwardWhat is the overall objective of scheduling?arrow_forwardWhat does it mean for a process to be "starved" according to the priority scheduling method? What are some ways that this may be avoided?arrow_forward
- Who needs to be involved in setting schedules?arrow_forwardIf the time remaining to complete a job is 10 days and the lead time remaining is 12 days, whatis the critical ratio? Is the order ahead of schedule, on schedule, or behind schedule?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_forward
- 5. Draw the Gantt Chart of M1, M2, M3. Due dates of the jobs are 16,14,10,8 in order. Use "FIFO" Processing Time (min) Routing Process and Machine Number OP-1 OP-3 OP-1 OP-2 OP-3 Job-1 4/M1 3/M2 2/M3 Job-2 1/M2 4/M1 4/M3 M1 M3 M2 M3 Job-3 3/M3 2/M2 3/M1 Job-4 3/M2 3/M3 1/M1 M3 M1 M2 M1 Job-1 Job-2 Job-3 Job-4 OP-2 M2 M1 M2 M3arrow_forward← Using the FCFS rule for scheduling, the sequence is 1-2-3 For the schedule developed using the FCFS rule, the total length of time taken to complete the three suits (including delivery)= 225 hours (enter your response as a whole number). Using Johnson's rule for 2-machine scheduling, the sequence is A Sunny Park Tailors has been asked to make three different types of wedding suits for separate customers. The table below highlights the time taken in hours for cutting and sewing (process 1) and delivery (process 2) of each of the suits. Times Taken for Different Activities (hours) Cut and Sew 7 4 5 Suit 1 2 3 Deliver 2 3 6 Assume that orders for suits have been listed in the above table in the order in which they were receivedarrow_forwardRon Satterfield's excavation company uses both Gantt scheduling charts and Gantt load charts. Today, which is the end of day 7, Ron is reviewing the Gantt chart depicting these schedules: Day Job #151 was scheduled to begin on day 3 and to take 6 days. It got started on time and is 1 day ahead of schedule. Job #177 was scheduled to begin on day 1 and take 4 days. It is currently on time. Job #179 was scheduled to start on day 7 and take 2 days. It actually got started on day 6 and is progressing according to plan. Job #211 was scheduled to begin on day 5, but missing equipment delayed it until day 6. It is progressing as expected and should take 3 days. Job #215 was scheduled to begin on day 4 and take 5 days. It got started on time but has since fallen behind 2 days. Job 12 3 4 56 789 10 11 -- 151 177 + This exercise contains only part a. 179 a) Add the actual progress to the Gantt schedule shown on the right (on which the planned timings have been already plotted). Using the line…arrow_forward
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