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Chapter 2: Q9-9PE. (page 219)
Question: What are the four strategies for managing customer-induced variability?
The four strategies for managing customer induced variability are given below:
a) Classic accommodation
b) Low-cost accommodation
c) Classic reduction
d) Uncompromised reduction
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Question:The following table lists all costs of quality incurred by Sam鈥檚 Surf Shop last year. What was Sam鈥檚 appraisal cost for quality last year?
Annual inspection cost | \(155,000 |
The annual cost of scarp materials | \)286,000 |
Annual rework cost | \(34,679 |
The annual cost of quality training | \)456,000 |
Annual warranty cost | \(1,546,000 |
Annual testing cost | \)543,000 |
How do you determine the idle time percentage from a given assembly-line balance?
Question: The flow of materials through eight departments is shown on the next page. Even though the table shows flows into and out of the different departments, assume that the direction of flow is not important. In addition, assume that the cost of moving material depends only on the distance moved.
a. Construct a schematic layout where the departments are arranged on a 2 x 4 grid with each cell representing a 10 x 10-meter square area.
b. Evaluate your layout using a distance-times-flow measure. Assume that distance is measured rectilinearly (in this case, departments that are directly adjacent are 10 meters apart and those that are diagonal to one another are 20 meters apart).
A small barbershop has a single chair and an area for waiting, where only one person can be in the chair at a time, and no one leaves without getting their hair cut. So the system is rough:
Entrance Wait Haircut Exit
Assume customers arrive at the rate of 10 per hour and stay an average of 0.5 hours. What is the average number of customers in the barbershop?
Question: Francis Johnson鈥檚 plant needs to design an efficient assembly line to make a new product. The assembly line needs to produce 15 units per hour, and there is room for only four workstations. The tasks and the order in which they must be performed are shown in the following table. Tasks cannot be split, and it would be too expensive to duplicate any task.
Task | Task Time (Minutes) | Immediate Predecessor |
A | 1 | - |
B | 2 | - |
C | 3 | - |
D | 1 | A,B,C |
E | 3 | C |
F | 2 | E |
G | 3 | E |
a. Draw the precedence diagram.
b. What is the workstation cycle time required to produce 15 units per hour?
c. Balance the line so that only four workstations are required. Use whatever method you feel is appropriate.
d. What is the efficiency of your line balance, assuming the cycle time from part (b)?
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