MSSC Quality Introduction to SPC

A 100% inspection of a new product revealed that a run of 200 parts resulted in several parts being rejected. If the rejection rate was 3%. How many bad parts were created?

• 6

• 60

• 66

• 16

If 200 parts are sampled from every 3000 produced, what is the sampling rate?

• 0.67 percent

• 67 percent

• 6.7 percent

• 0.067 percent

If a sampling plan requires 5 percent of the parts to be inspected, how many parts should be inspected in 1,000 parts?

• 5

• 20

• 50

• 500

Parts are inspected __________ to make sure the typical characteristics of a produced parts are found.

• In small lots

• In large lots

• At only one time each shift

• Randomly

Random parts should be selected from a production run for inspection because __________.

• Selecting parts in batches takes too much time for an operator to inspect

• The odds of finding the one bad part are increased

• to prevent the operator from only maintaining the machine when a sample is getting ready to be taken

• it is the best method to ensure the sample is representative of the typical characteristics of the production run

SPC stands for __________.

• Standard practices and competencies

• Statistical process control

• Staffing protocols and cost

• Standard part cost

Statistical process control (SPC) is used to __________.

• Provide instructions for operation of process control equipment

• determine when a process is going to produce bad parts before it actually does

• provide high performance control of machines in process applications

• schedule preventive maintenance

To save money using SPC, a factory determines if there is a(n) __________ in a process.

• Defect

• Special cause variation

• Error

• Common Cause Variation

Workers perform __________ to control product quality, develop SPC charts, and determine if parts meet specifications.

• Root cause analysis

• Predictive maintenance activities

• Team meetings

• Inspections

Two types of variation are __________.

• Regular cause and special case

• Common cause and regular cause

• Common cause and special cause

• Controlled cause and uncontrolled cause