Tutorial 8 Suggested Solutions.pdf

# The table below shows the standard time and immediate

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demand is to process 4 jobs per 400 minute working day. The table below shows the standard time and immediate predecessors for each activity in the process. Activity Time (minutes) Immediate predecessor A 70 - B 15 A C 8 - D 32 - E 47 C,D,G F 25 B,E G 61 - H 52 - I 29 G,H J 42 I K 50 F,J a) Construct a precedence diagram. b) Calculate the cycle time corresponding to a market demand of 4 jobs per day. c) What is the theoretical minimum number of workstations? d) Use the longest activity time rule as the primary rule to balance the line. e) What is the efficiency of the line? How does it compare with theoretical maximum efficiency? a) b) Calculate the cycle time corresponding to a market demand of 4 jobs per day. C = 400/4 = 100 minutes c) What is the theoretical minimum number of workstation? A B C D F G H I J E K

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FIT2090 Business Information Systems and Processes Page 3 of 3 TM = 431/100 = 4.31 ≈ 5 workstations d) Use the “longest activity time first” as the primary rule to balance the line. Station Activity Idle time Feasible activities Activity with longest time 1 A 30 B and C B B 15 C C C 7 None 2 G 39 D D D 7 None 3 H 48 E and I E E 1 None 4 I 71 F and J J J 29 F F F 4 None 5 K 50 e) What is the efficiency of the obtained solution? How does it compare to the theoretical maximum efficiency? Efficiency = 431/(5*100) = 86.2%. This design achieves maximum efficiency, because it uses the theoretical minimum number of stations.
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