1. If Cp for a centered process equals to 1.5, this means the process is capable
ID: 3290966 • Letter: 1
Question
1. If Cp for a centered process equals to 1.5, this means the process is capable of meeting design specifications.
a) True
b) False
2) A precision parts manufacturer produces bolts for use in military aircraft. The specifications for bolt length are 37.50 plus/minus 0.25 cm. The company has established an x-bar chart and an R-chart using samples of size five. The center lines for the x-bar chart and R-chart are set at 37.35 cm and 1.05 cm, respectively. What is the value of Cpk for this process?
a) 0.75
b) 0.07
c) 0.03
d) 0.28
3) Suppose a process has an upper specification limit 5.60, and a lower specification limit 5.0. If a customer requires a demonstrated Cp of 2.0. What must the process standard deviation be?
a) 0.1
b) 0.05
c)0.15
4) If a process is neither capable nor in control, the desired first step is to:
a) Determine the process capability index
b) Redesign the equipment
c) Remove sources of special causes of variation
d) Remove common causes of variation
a) 0.75
b) 0.07
c) 0.03
d) 0.28
Explanation / Answer
1) false because cp should be greater than 1.5
2)Cpk = min (USL-mean)/3*std ,(mean -Lsl)/3std)
min(37.05-1.05)/3*37.35 ,(1.05-0.25)/3*3 7}35
= 0.007
answer option b
3) cp=usl-Lsl/6std
2.0=(5.6-5 ) / 6*std
2.0 = 0.6/6 std
2.0=0.1std
std=0.1÷2.0= 0.05
answer option b
4) option c
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