Deck 18: Optimizing and Controlling Processes Through Statistical Process Control

Question 1

Variation in any amount is considered a negative for quality.

Answer 1

True

Question 2

At the heart of SPC is the realization that all processes have a natural, or built-in, variation. Processes may also be affected by special causes of variation. The objective of SPC is to separate special-cause variation from the natural variation.

Answer 2

True

Question 3

For a process under SPC, it is important to frequently tweak its parameters in order to keep the process within the upper and lower control limits.

Answer 3

False

Question 4

Before a process can qualify for SPC, it must be free of special-cause variation.

Question 5

Upper and lower control limits may be derived from logged process data, or from tolerance specifications.

Question 6

The rationale for western manufacturers to embrace SPC is:

A) Improve product quality and simultaneously reduce costs
B) To be able to compete better with Japan and the world's markets
C) Improve their product image
D) All of the above

Question 7

The most common inhibitor of SPC is:

A) Inadequate training
B) Lack of resources resulting from the absence of management commitment
C) Failure to have processes under control
D) Low production rates

Question 8

When a process is "in control" what percent of its output will be within the ±3? limits?

A) 66.6%
B) 82.4%
C) 99.7%
D) 100%

Question 9

The minimum management involvement relative to SPC training involves:

A) Providing sufficient funding
B) Teaching classes
C) Commitment
D) None of the above

Question 10

The first step in the SPC execution phase is:

A) To develop control charts
B) Flowcharting or characterizing the process to which SPC will be applied
C) Eliminate the special causes of variation
D) Collect and plot SPC data