Question 1

A trainee mechanic trying to understand all the reasons a car won't start may want to draw a:

a. Cause-and-effect diagram

b. A scatter-plot

c. A process flow-chart

d. A Pareto chart

Question 2

All the following statements about process capability are true, EXCEPT for:

a. Cp and Cpk are exactly the same when the process is centered

b. Centering improves the capability of the process

c. The process is capable if Cp > 1.0 even when the mean is not centered

d. With a non-centered mean a process may be capable to one specification limit even if not capable overall

Question 3

Each day a bank tracks the 50 ATMs that it owns to see how many of them had technical issues. Over the last month it found that on average 3 ATMs had technical issues each day.

Based on this information the 2-sigma lower and upper control limits for the percentage of ATMs that have issues are:

a. -0.72% and 12.72%

b. 0% and 16.08%

c. -4.08% and 16.08%

d. 0% and 12.72%

Question 4

Customer specifications require that the percent of fat in low-fat yogurt be between 0.5% and 2%. A process produces yogurt with an average of 1.25% and a standard deviation of 0.20%.

The process capability ratio for this process is:

a. 0.75

b. 1.25

c. 0.83

d. 1.1