Introduction to SPC (Statistical Process Control)
2. A 100% inspection of a new product revealed that a run of 200 parts resulted in several parts being rejected. If the rejected rate was 3%; how many bad parts were created a. 6 b. 60 c. 66 d. 16
a. 6
19. If a sampling plan requires 5% of the parts to be inspected how may parts should be inspected in 1,000 parts. a. 5 b. 20 c. 50 d. 500
c. 50
12. If 200 parts are sampled from every 3000 produced, what is the sampling rate. a. .67% b. 67% c. 6.7% d. .067%
c. 6.7&
6. The Cpk is a statistical process control term that describes the _____. a. Standard outcome of a process b. Standard deviation of a process c. Capability of a process d. Mean of a process
c. Capability of a process
8. Two types of variations are ________. a. Regular cause and special cause b. Common cause and regular cause c. Common cause and special cause d. Controlled cause and uncontrolled cause
c. Common cause and special cause
11. Workers preform _______ to control product quality, develop SPC charts, and determine if parts meet specification. a. Root cause Analysis b. Predictive maintenance activities c. Inspections
c. Inspections
3. Production departments develop quality history data base by _________. a. Working as a team of solve problems b. Stopping the line when the numbers of defects suddenly increase c. Recording inspection data d. Using concurrent engineering
c. Recording inspection data
10. Predicting the percentage of parts that will fall within certain measurements if the data is distributed normally is done by calculating the __________. a. Range b. Mean c. Standard deviation d. Cell width
c. Standard deviation
17. Random parts should be selected from a production run for inspection because ____ a. Selection parts in batches takes too much time for an operator to inspect b. The odds of finding the one bad part are increased c. To prevent the operator from only maintaining the machine when a sample is getting ready to be taken d. It is the best method to ensure the sample is representative of the typical characteristic of the production run
d. It is the best method to ensure the sample is representative of the typical characteristic of the production run
15. Once the Cpk of a process is determined, it can predict the ___ of a product as long as the process _____. a. Production rate, remains stable b. Life cycle, is within specifications c. Quantity, is not stopped d. Quality, remains in control
d. Quality, remains in control
4. Parts are inspected _____ to make sure the typical characteristics of a produced parts are found. a. In small lots b. In large lots c. At only one time at the shift d. Randomly
d. Randomly
5. A bell-shaped curve that results from a large group of measurement is the basic concept of ___. a. Central tendency b. Standard deviation c. Mean d. Controlled variation
a. Central tendency
14. When constructing a histogram, no value should ever fall on a(n) a. Baseline b. Boundary c. Axis d. Even number
b. Boundary
16. Statistical process control (SPC) is used to a. Provide instructions for operation of process control equipment b. Determine when a process is going to produce bad parts before it actually does c. Provide high performance control of machines in process applications d. Schedule preventive maintenance
b. Determine when a process is going to produce bad parts before it actually does
7 A ___ is a graphic method to show the data is distributed across the range of values. a. Pareto diagram b. Histogram c. Scatter diagram d. Flow Chart
b. Histogram
1. If the histogram of a process is not bell-shaped, then the process is _____. a. Not centered b. Not stable c. Normal d. None of the above
b. Not stable
13. To save money using SPC, a factory determine if there is a (n) _________ in a process. a. Defect b. Special cause variation c. Error d. Common cause variation
b. Special cause variation
18. SPC stands for a. Standard practices and competencies b. Statistical Process Control c. Staffing protocols and cost d. Standard part cost
b. Statistical Process Control
