Question

n 10 The following set of jobs must be processed ed serially through a two-step system. The times at out of each process are in hours. If Johnson's Rule is used to sequence the jobs then Job A would complete processing on operation 2 at Job Process Process 2 A 12 9 B 11 C 7 6 D 10 14 E 5 8 Select one: A. hour 38. LO A 12 8 11 C 7 6 D 10 14 E 5 8 Select one: A. hour 38. o B. hour 47 C. hour 21 o D. hour 35. co LO B

Answer 1

Johnson's rule minimizes the time to complete al jobs in both processes/ work centers.

As per Johnson's rule,

- List the Operation times for all jobs

- Select the shortest operating time (SOT) overall

- If SOT is for : 1st Process then schedule that job first OR 2nd Process then schedule that job last

- Repeat above steps until all jobs are scheduled

Looking at processing time given for all jobs in Process 1 and Process 2, we can use above logic to sequence the jobs that minimizes the flow time.

Since shortest time of 5 hours is for Job E in Process 1 hence we start with Job E. Then next shortest time of 6 hours is for Job C in Process 2, hence we will end with Job C and so on.

E -> B -> D -> A -> C

Book1-Excel Puneet Sabharwal Share Tell me what you want to do.. File Home Insert Page Layout Formulas Data Review View E AutoSum Cut 11 A A== Wrap Text Calibri Normal General Bad Good Fill Copy Paste Format Painter Sort&Find & Filter Select Conditional Format as Neutral Formatting Table % » Insert Delete Format Merge&Center Calculation Check Cell A BIU Clear clpboard Alignment Number Styles Cels Edting Font fJob A ANS BC DE F GHIJKLMNO P QR S T UVW X Y Z AA AB AC AD AE AF AG AH Al AJ AK AL AM AN AO AP AQ AR AS AT AU AV AW AX AY A 2 4 Job E Job B Job D Job A 5 Job D Job E Job 8 lob A 6 7 12 3 45 6 7 8 9 10 11 12 13 14 15 16 17 1819 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 647 48 49 8 9 10 11 12 13

Hence, the Job A would complete processing on operation 2 at 47 hour.

So, option B. hour 47 is the correct answer.

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