TUTORIAL: CHAPTER 2.4a) Correle Appliances wants to establish an assembly line to manufacture its new product. The goal is to produce 480 units per 40-hour work week. The tasks, task times, and immediate predecessors are shown in Table Q4(a). Table Q4(a)Work taskTask time (sec)Task predecessor

A70-

B60A

C120B

D60-

E240C,D

F100A

G190E,F

i) Draw a precedence diagram.ii) What is the cycle time for this operation?iii) What is the theoretical minimum number of workstations?iv) Assign tasks to the workstations using the longest task time heuristic.v) What is the efficiency of this line?

b) Table Q4(b) shows task times and precedence relationships of manufacturing process to be balanced. Assume that cycle time is to be minimum as possible.

Table Q4(b)Work taskTask time (minutes)Task predecessor

A0.2B

B0.4D

C0.3D

D1.3G

E0.1F

F0.8G

G0.3H

H1.2End

i) Draw the precedence diagram. ii) Assign tasks to workstations in order of greatest number following tasks.iii) Determine the percentage of idle time. (5 marks)

c) Hemo-tech, Inc., a biomedical technology and research laboratory, produces a standard blood filtering device on an assembly line basis. Six basic tasks are performed along an assembly line. The time to perform each task and the tasks that must immediately precede each task are in the Table Q3. Twenty pumps per 450-minute day must be produced by the assembly line.Table Q3TaskPerformance Time (min)Predecessors

A5.40--

B3.20A

C1.50--

D2.80B, C

E17.10D

F12.80E

i) Draw a precedence diagram of this operation.ii) What is the bottleneck task?iii) What is the cycle time?iv) What is the theoretical minimum number of workstation?v) Assign task to the workstation using Following Task Rule and break the tie using Positional weight Rule.vi) What is the balance delay?vii) What is the overall efficiency of the assembly line?(10 marks)