OPMT 303 Exam 2 Practice Test
Aggregate Planning is
the activity of matching supply of output with demand over the medium time range.
Aggregate planners attempt to balance:
Capacity and demand
When MRP II systems include feedback, they are known as:
Closed loop MRP
Which one of the following most closely describes net materials requirements?
Gross requirements - amount on hand -schedule receipts
If a process is performing as it should, it is still possible to obtain observations which are outside of which limits? (I) tolerances (II) control limits (III) process variability
I and II
Managers have obligations to a wide variety of stakeholders such as shareholders, employees and customers. When considering outsourcing production to offshore suppliers, managers have to weigh __. I) Cost benefits that might make shareholders wealthier II) Quality issues that might make firms less productive and/or products riskier III) The investments already tied up in relationships with existing suppliers
I, II and III
The person associated with the "zero defect" concept is:
Philip B. Crosby
Which of the following relationships must always be incorrect?
Tolerances > control limits > process variability
What quantity is available for commitment to new customers in either of the two periods?
4
A quality analyst wants to construct a control chart for determining whether four machines, all producing the same product, are in control with regard to a particular quality attribute. Accordingly, she inspected 1,000 units of output from each machine in random samples, with the following results:Machine Total Defectives#1 23 #2 15 #3 29 #4 13 What is the estimate of the standard deviation of the sampling distribution of sample proportions for this process?
.0044
What is the estimate of the standard deviation of the sampling distribution for an instructor's sample proportion of failures?
.03
What is the estimate of the mean proportion of failure for these instructors?
.10
The chair of the operations management department at Quality University wants to construct a p-chart for determining whether the four faculty teaching the basic P/OM course are in control with regard to the number of students who fail the course. Accordingly, he sampled 100 final grades from last year for each instructor, with the following results:Instructor Number of Failures Prof. A 13 Prof. B 0 Prof. C 11 Prof. D 16 What is the sample proportion of failures (p) for Prof. D?
.16
The specification limit for a product is 8 cm and 10 cm. A process that produces the product has a mean of 9.5 cm and a standard deviation of 0.2 cm. What is the process capability, Cpk?
.83
When a process is in control, it results in there being, on average, 16 defects per unit of output. C-chart limits of 4 and 28 would lead to a _______ chance of a Type I error
0.3%
A firm has 43 units of a certain product on hand. Forecasts for the first two planning periods are 20 units each. A production quantity of 80 units is planned to be available in period 3. Customer orders are 22 for period 1 and 17 for period 2. What is the projected on-hand inventory at the end of period 2?
1
The specifications for a product are 6 mm ± 0.1 mm. The process is known to operate at a mean of 6.05 with a standard deviation of 0.01 mm. What is the Cpk for this process?
1.67
Studies on a bottle-filling machine indicates it fills bottles to a mean of 16 ounces with a standard deviation of 0.10 ounces. What is the process specification, assuming the Cpk index of 1?
16 ounces plus or minus .30 ounces
What is the estimate of the process mean for whenever it is under control?
20 ounces
What are the x-bar chart three sigma upper and lower control limits?
23.16 and 16.84
What is the expected inventory at the end if April, 2008?
250
A master production schedule quantity of 300 units will arrive in week 6. Weekly demand over weeks 3 through 10 is forecasted at 50 units. At present, orders have been booked in various quantities in weeks 1, 2, 3, and 4. What is available to promise for week
300
If 40 Ps are needed, and on-hand inventory consists of 15 Ps and 10 each of all other components and subassemblies, how many Cs are needed?
350
The following data occurs chronologically from left to right: 15.2 19.7 16.0 11.1 14.8 14.5The number of runs up and down is:
4
The number of runs up and down for the data above is: Observations: 1 2 3 4 5 6 # of defects: 10 18 13 15 9 12
5
When a process is in control, it results in there being, on average, 16 defects per unit of output. C-chart limits of 8 and 24 would lead to a _______ chance of a Type I error
5%
What is the mean of the sampling distribution of sample means when service life is in control?
500 hours
A design engineer wants to construct a sample mean chart for controlling the service life of a halogen headlamp his company produces. He knows from numerous previous samples that this service life is normally distributed with a mean of 500 hours and a standard deviation of 20 hours. On three recent production batches, he tested service life on random samples of four headlamps, with these results: 90. What is the sample mean service life for sample 2?
515 hours
The output of MRP is:
A schedule of requirements for all parts and end items
Which of the following is an element of TQM?
All of the above
Which of the following is an input to aggregate planning?
All of the above
____ variation is a variation whose cause can be identified.
Assignable
That portion of projected inventory which enables marketing to make realistic commitments about delivery dates for new orders is:
Available-to-promise inventory
The process of identifying other organizations that are best at some facet of your operations, and then modeling your organization after them is known as:
Benchmarking
The MRP input listing the assemblies, sub-assembilies, parts, and raw materials needed to produce one unit of finished product is the:
Bill-materials
A process results in a few defects occurring in each unit of output. Long-run, these defects should be monitored with ___.
C-charts
The purpose of control charts is to:
Distinguish between random variation and assignable variation in the process
Warranty service, processing of complaints, and costs of litigation are examples of ________.
External failure costs
Management behaviors supporting an organizational culture that encourages continuous improvement include which of the following? (I) develop a vision statement for the organization (II) develop a reward system that promotes the philosophy (III) institute continuous training programs (IV) make decisions that adhere to the philosophy
I, II, III, and IV
ERP's primary value comes from applications:
Integration
Lost production time,scrap,and rework are examples of _____.
Internal failure costs
Which of the following is NOT a basic option for altering the availability of capacity in a service environment
Inventory
For upper and lower control limits of 23.29 and 16.71, which machine(s), if any, appears(s) to have an out-of-control process mean?
Machine 1
A recent effort to expand the scope of production resource planning by involving other functional ares in the planning process has been:
Manufacturing resources planning
The MRP input stating which end items are to be produced, when they are needed, and what quantities are needed is the:
Master Schedule
The MRP input storing information on the status of each item by time period
Master production schedule
The direct result of disaggregating the aggregate plan is the:
Master schedule
If he uses upper and lower control limits of 22 and 18 ounces, on what day(s), if any, does this process appear to be out of control?
Monday
Under lot-for-lot, order sizes for component parts are essentially determined directly from which one of the following?
Net Requirements
The quality control improvement tool which distinguishes between the "important few" and the "trivial many" is __________.
Pareto analysis
Loss of business, liability, productivity and costs are consequences of _______.
Poor quality
A type 1 error is most associated with:
Producer's risk
A visual depiction of the the sub-assemblies and components that are needed to produce and/or assemble a product is called a(n):
Product structure tree
Which of the following quality control sample statistic indicates a quality characteristic that is an attribute?
Proportion
A process that evaluates output relative to standard and takes corrective action when output doesn't matter standards is called:
Quality Control
Which of the following steps necessary to ensure that a master schedule is valid?
Rough-cut capacity planning
Efforts used to evaluate process output to decide if a process is "in control" or if corrective action is needed are referred to as"
Statistical process control
Which of the following is NOT a basic for altering demand?
Subcontracting
Aggregate planning capacity planning for:
The intermediate range
A range control chart (R-chart) was developed with LCLR = 0 and UCLR = 2.50. Similarly, an X-Bar chart was developed with LCLx-bar = 15.0 and UCLx-bar = 24.0. and . Five (5) additional samples of size 4 were taken from a process. The means and ranges of the five samples are given in the table below. Is the process in control?
The process mean is in control, but the process range is out of control.
In order to use the "level capacity strategy", variations in demand are met by:
Using combination of inventories , overtime, part-time, and back orders
In using the "chase strategy" variations in demand could be met by:
Varying output during regular time without changing employment levels
The person associated with the "14 Points" and Total Quality Management is:
W. Edwards Deming
Which of these items would be most likely to have dependent demand?
X-Box batteries
A control chart used to monitor the process mean is:
X-bar chart
A quality circle is ________.
a voluntary group of employees
Fixing a problem will often cost money; to minimize these costs it is best to find and fix the problem _______.
during the design phase
Studies on a bottle-filling machine indicate that it fills bottles to a mean of 16 ounces with a standard deviation of 0.10 ounces. What is the process specification, assuming the Cpk index of 1?
lower spec = 15.7 ounces and upper spec = 16.3 ounces
For upper and lower control limits of .026 and .014, which machine(s), if any, appear(s) to be out-of-control for process proportion of defectives?
machine #3 and #4
A computer-based information system designed to handle ordering and scheduling of dependent-demand inventories is:
material requirements planning (MRP)
An MRP system whose records are updated continuously is referred to as a(n):
net-change system
If customer satisfaction doesn't always lead to customer loyalty, firms may need to focus additional effort on __________ strategies.
retention
A design engineer wants to construct a sample mean chart for controlling the service life of a halogen headlamp his company produces. He knows from numerous previous samples that this service life is normally distributed with a mean of 500 hours and a standard deviation of 20 hours. On three recent production batches, he tested service life on random samples of four headlamps, with these results:Sample Service Life (hours)1 495 500 505 5002 525 515 505 5153 470 480 460 470If he uses upper and lower control limits of 520 and 480 hours, on what sample(s) (if any) does service life appear to be out of control?
sample 3
The optimum level of inspection is where the:
total cost of inspection and defectives is minimum
