Assume you are sequencing jobs using Johnson\'s rule. There are three jobs calle

Question

Assume you are sequencing jobs using Johnson's rule. There are three jobs called A, B and C. The first step in assembling and the second step is painting. Job A requires 3 hours to assemble and 6 hours to paint. Job B requires 7 hours to assemble and 2 hours to paint. Job C requires 4 hours to assemble and 1 hour to paint. The objective is to minimize the total processing time of all jobs, using Johnson’s rule. What is the correct sequence to process the jobs?

A) A - C - B

B) B - C - A

C) B - A - C

D) A - B - C

E) C – B - A

Explanation / Answer

Time spent by 3 jobs at both steps are given below :

Step 1 ( Tine )

Step 2 ( Time )

Johnson’s Rule is:

The shortest processing time is 1 and that is in Step 2 for Job C . Therefore Job C to be done last.

The next shortest possible time is 2 and that is in step 2 for Job B . Therefore Job B to be done second last

Hence , the job to be done first is A

The correct sequence therefore is A-B-C

ANSWER : D ) A-B-C

Step 1 ( Tine )

Step 2 ( Time )

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