Learning Materials
Features
Discover
Chapter 2: Q.13-8CQM (page 344)
Question:If the process could be improved so that the standard deviations were only about .10 millimeters, what would be the best that could be expected with the processes relative to fraction defective?
Answer
We can expect about 1.9 defective fractions from the given processes.
Over 30 million students worldwide already upgrade their learning with 91影视!
All the tools & learning materials you need for study success - in one app.
Get started for free
A graphics reproduction firm has four automatic equipment units but occasionally becomes inoperative because of the need for supplies, maintenance, or repair. Each Unit requires service roughly twice each hour, or, more precisely, each Unit of equipment runs an average of 30 minutes before needing service. Service times vary widely, ranging from a simple service (such as pressing a restart switch or repositioning paper) to more detailed equipment disassembly. The average service time, however, is minutes. Equipment downtime results in a loss of \(20 per hour. The one equipment attendant is Paid \)6 per hour.
Using finite queuing analysis, answer the following questions:
B. What is the average number of units still in operation?
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).
Assume a fixed cost of \(900, a variable cost of \)4.50, and a selling price of \(5.50.
a.What is the break-even point?
b.How many units must be sold to make a profit of \)500.00?
c.How many units must be sold to average \(0.25 profit per unit? \)0.50 profit per unit?$1.50 profit per unit?
Question:Resistors for electronic circuits are manufactured on a high-speed automated machine. The machine is set up to produce a large run of resistors of 1,000 ohms each. To set up the machine and to create a control chart to be used throughout the run, 15 samples were taken with four resistors in each sample. The complete list of samples and their measured values are as follows:
| Sample number | Readings | |||
1 | 1010 | 991 | 985 | 986 |
2 | 995 | 996 | 1009 | 994 |
3 | 990 | 1003 | 1015 | 1008 |
4 | 1015 | 1020 | 1009 | 998 |
5 | 1013 | 1019 | 1005 | 993 |
6 | 994 | 1001 | 994 | 1005 |
7 | 989 | 992 | 982 | 1020 |
8 | 1001 | 986 | 996 | 996 |
9 | 1006 | 989 | 1005 | 1007 |
10 | 992 | 1007 | 1006 | 979 |
11 | 996 | 1006 | 997 | 989 |
12 | 1019 | 996 | 991 | 1011 |
13 | 981 | 991 | 989 | 1003 |
14 | 999 | 993 | 988 | 984 |
15 | 1013 | 1002 | 1005 | 992 |
Develop an x-chart and an R-chart and plot the values. From the charts, what comments can you make about the process? (Use three-sigma control limits as in Exhibit 13.7.)
Question: The following tasks are to be performed on an assembly line:
Task | Seconds | Task That Must Precede |
A | 20 | - |
B | 7 | A |
C | 20 | B |
D | 22 | B |
E | 15 | C |
F | 10 | D |
G | 16 | E, F |
H | 8 | G |
The workday is seven hours long. Demand for the completed product is 750 per day.
a. Find the cycle time required to produce 750 units per day.
b. What is the theoretical number of workstations?
c. Draw the precedence diagram.
d. Balance the line using sequential restrictions and the longest-operating-time rule.
e. What is the efficiency of the line balanced as in part (d), assuming it is running at the cycle time from part (a)?
f. Suppose that demand rose from 750 to 800 units per day. What would you do? Show any amounts or calculations.
g. Suppose that demand rose from 750 to 1,000 units per day. What would you do? Show any amounts or calculations.
What do you think about this solution?
We value your feedback to improve our textbook solutions.
Explanations 
Textbooks 
Flashcards 
91影视 AI 
Notes 
Study Plans 
Study Sets 
Find a degree 
Magazine