A machining center in a job shop for a local fabrication company has five unproc

Question

A machining center in a job shop for a local fabrication company has five unprocessed jobs remaining at time 0, The jobs are labeled 1, 2, 3, 4 and 5 in the order that they entered the shop. The respective processing times and due dated are given in the table below. A. According to First Come First Served rule, which job would be the next job to be processed? B. According to Earliest Due Date rule, which job would be the next job to be processed? C. According to Longest Process Time rule, which job would be the next job to be processed? D. According to Critical Ratio rule, which job would be the next job to be processed?

Explanation / Answer

Solution :

A) First come first serve :

According to first come first serve, the process which arrived first will go next.

but here at 0 time all 5 processes were arrived and no other information regarding arriving time is given so lets assume that all processes arrived at 0 time.

In that case processes will go in this order : 1, 2, 3, 4, 5

2) Earliest due date first :

Job which has least due date will go first.

order of earliest due date first : 5, 2, 3, 4, 1

3) Longesr process time first :

Job with largest process time will be executed first .

Order of jobs : 4, 3, 5, 2, 1

4) Critical ratio rule :

critical ratio = due time/ process time

job with least critical ratio will be excuted first :

critical ratio of each job :

1- 7.14

2- 2

3- 1.81

4- 1.25

5- 1.19

hence , order of job : 5, 4, 3, 2, 1

if you have any doubts, you can ask in comment section.

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