1. a. Earliest Due Date: Job Sequence Machine Center XA Number of days taken for
ID: 372926 • Letter: 1
Question
1.
a.
Earliest Due Date:
Job Sequence
Machine Center XA
Number of days taken for moving a job
Machine Center YA
Day when Due
Remark
Start Day
Days Taken
Finish Day
Start Day
Days Taken
Finish Day
A
0
35/8 = 4.375
4.375
2
6.375
36/8 = 4.5
10.875
10
Not completed on time.
C
4.375
144/8 = 18
22.375
2
24.375
30/8 = 3.75
28.125
25
Not completed on time.
B
22.375
97/8 = 12.125
34.5
2
36.5
22/8 = 2.75
39.25
54
Completed on time.
b.
Job
Total Processing Time Remaining (in days)
Day when Due
Critical Ratio = (Remaining Time until Due Date/ Remaining Processing Time)
Priority Rank (Lower the Critical Ratio, higher the rank.)
A
71 / 8 = 8.875
10
10 / 8.875 = 1.13
1
B
119 / 8 = 14.875
54
54 / 14.875 = 3.63
3
C
174 / 8 = 21.75
25
25 / 21.75 = 1.15
2
Critical Ratio:
Job Sequence
Machine Center XA
Number of days taken for moving a job
Machine Center YA
Day when Due
Remark
Start Day
Days Taken
Finish Day
Start Day
Days Taken
Finish Day
A
0
35/8 = 4.375
4.375
2
6.375
36/8 = 4.5
10.875
10
Not completed on time.
C
4.375
144/8 = 18
22.375
2
24.375
30/8 = 3.75
28.125
25
Not completed on time.
B
22.375
97/8 = 12.125
34.5
2
36.5
22/8 = 2.75
39.25
54
Completed on time.
c.
Shortest Processing Time:
Job Sequence
Machine Center XA
Number of days taken for moving a job
Machine Center YA
Day when Due
Remark
Start Day
Days Taken
Finish Day
Start Day
Days Taken
Finish Day
A
0
35/8 = 4.375
4.375
2
6.375
36/8 = 4.5
10.875
10
Not completed on time.
B
4.375
97/8 = 12.125
16.5
2
18.5
22/8 = 2.75
21.25
54
Completed on time.
C
16.5
144/8 = 18
34.5
2
36.5
30/8 = 3.75
40.25
25
Not completed on time.
Job Sequence
Machine Center XA
Number of days taken for moving a job
Machine Center YA
Day when Due
Remark
Start Day
Days Taken
Finish Day
Start Day
Days Taken
Finish Day
A
0
35/8 = 4.375
4.375
2
6.375
36/8 = 4.5
10.875
10
Not completed on time.
C
4.375
144/8 = 18
22.375
2
24.375
30/8 = 3.75
28.125
25
Not completed on time.
B
22.375
97/8 = 12.125
34.5
2
36.5
22/8 = 2.75
39.25
54
Completed on time.
Explanation / Answer
Jobs A, B, and C are waiting to be started on machine center XA and then be completed on machine center YA. The following information pertains to the jobs and work
Jobs A, B, and C are waiting to be started on machine center XA and then be completed on machine center YA. The following information pertains to the jobs and work centers. XE36 1. Job Hours allowed for Hours allowed forDay Machine Center XA Machine Center YA When due 35 97 10 1.5X 25 30 Machine center XA and machine center YA have 40 hours of capacity per week (5 working days per week, eight hours/day). Two days are allowed to move jobs between machine centers. hesrhedued by carliest d date,can they be completed on time b. If these jobs are rescheduled by the critical ratio, can they be completed on time? c. If these jobs are rescheduled by shortest operation (shortest processing time), can they be completed on time?Related Questions
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