Question

An assembly line is to operate eight hours per day with a desired output of 160 units per day. The following table contains information on this product's task times and precedence relationships: IMMEDIATE PREDECESSOR TASK TIME (SECONDS) 100 TASK A 70 D 50 40 C C. D 70 140 G H b. What is the required workstation cycle time meet the desired output rate? (Round your answer to the nearest whole number.) Workstation cycle time seconds per unit c. Balance this line using the longest task time. (Leave no cells blank be certain to enter "0" wherever required.) (in seconde Work Station Task (Click select) (Click select) select) (Click (Click to select) IV d. What is the efficiency of your line balance, assuming it is running at the cycle time determined in part b? (Round your answer to 1 decimal place.) Efficiency %

Answer 1

Answer b: desired output = 160 units per 8 hours= 160/(8*60*60) or 180 secs per units

Hence the workstation time required is 180 secs per unit

Answer c: Line balancing, required cycle time is 180 s per workstation. Sum of task times in a workstation cannot be more than cycle time of 180 secs.

Workstation	Tasks	Idle time= Cycle time- sum of task time	Reason
1	A, B	10	Start with A also include B- longest task time,
2	C, D, F	0	First add C and D, these are the only tasks that can be performed. Rest of the tasks are successor of C and D. assign F- Longest task time rule
3	E, G	20	Assign E first and then G
4	H	40	Only task remaining

Answer d: Balanced delay = no. of workstation*cycle time – total task time/ no. of workstation* cycle time =(4*180- 650)/(4*180)= 0.0972 ie 9.72%

Efficiency= 1-balanced delay= 90.3%