Johnson’s Rule is: Repeat steps 1,2 and 3 filling in the schedule from the front
ID: 372728 • Letter: J
Question
Johnson’s Rule is:
Repeat steps 1,2 and 3 filling in the schedule from the front and the back until all jobs have been scheduled
Accordingly schedule of jobs as follows :
B --- > F ----- > A -------- > D ------ > C ……… > E
CALCULATIONS
Operation 1 : B (3), F(17) , A (27), D ( 39) , C (45), E (50)
Operation 2 : B (7), F (30), A (38), D ( 46) , C (48), E (51)
(time in parentheses is cumulative hours to complete)
It will take 51 hours to complete all THE jobs
Scheduled Order
Job
1
B
2
F
3
A
4
D
5
C
6
E
THE TOTAL LENGTH OF TIME TAKEN TO COMPLETE THE SIX JOBS ( USING 2ND OPERATION) = 51 HOURS
Scheduled Order
Job
1
B
2
F
3
A
4
D
5
C
6
E
Explanation / Answer
Using Johnson's rule for 2-machine scheduling, the sequence is Six jobs are to be processed through a two-step operation. The first operation involves sanding, and the second involves painting. Processing times are as follows: Scheduled Order Operation 1 (hours) 10 Operation 2 Job 12 13 For the schedule developed using Johnson's rule, the total length of time taken to complete the six jobs (including the 2nd operation) hours (enter your response as a whole number).
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