Precedence Diagram and Line Balancing

Answer 1
a. The precedence diagram.
b. Workstation cycle time
C = production time per day/required output per day
= (450 minutes/day)/360units per day
= 1.25 minutes per unit or 75 seconds per unit
a. Balancing the line
Work station Task Task time Idle time
I
A
C
E
30
30
15 0

II F 65 10
III
B
G
35
40 0
IV
D
H
35
25 15
b.
d. Efficiency of line balance
Efficiency =
= 275 / 4(75)
= 0.917 or 91.7%

Answer-2
C = (5 Hours X 5 Days X 60 min/hr)/ 3000 units / day
= 0.5 min/ unit
N = 1.9 min / 0.5 min
= 3.8
= 4