This set of Total Quality Management Multiple Choice Questions & Answers (MCQs) focuses on “Control Charts for Attributes”.
1. The control chart that determines the fraction of rejected parts as non-conforming is ______
a) R-chart
b) S-chart
c) P-chart
d) C-chart
View Answer
Explanation: The control chart that determines the fraction of rejected parts as non-conforming is P-chart. It belongs to the category of control charts for attributes.
2. The total number of parts in ten samples of equal size is 1200. What is the average sample size?
a) 120
b) 12
c) 1.2
d) 1200
View Answer
Explanation: The total number of parts in ten samples of equal size is 1200. The average sample size is 1200/10=120. It is useful in calculating the control limits.
3. The total number of defect count is 200 and the total number of parts in ten samples of equal size is 1500. What is the fraction defective?
a) 0.131
b) 0.134
c) 0.137
d) 0.140
View Answer
Explanation: The total number of defect count is 200 and the total number of parts in ten samples of equal size is 1500. The fraction defective is calculated as 200/1500 = 0.134.
4. The p-chart is used when subgroup size is variable.
a) True
b) False
View Answer
Explanation: The p-chart is used when subgroup size is variable. The np chart is used when the subgroup size is constant. The np chart is preferred because it saves time in the calculation for each subgroup.
5. The control chart for defects is called as _______
a) R-chart
b) S-chart
c) P-chart
d) C-chart
View Answer
Explanation: The control chart for defects is called as C-chart. It records the number of defects in the sample. It is an important control chart for attributes.
6. What is the basis for C-chart?
a) Normal distribution
b) Poisson distribution
c) Weibull distribution
d) Exponential distribution
View Answer
Explanation: The basis for C-chart is the Poisson distribution. C-chart counts the number of defects in the sample. Here, the letter ‘C’ refers to ‘count’.
7. When the subgroup size varies from one sample to another, U-chart is used.
a) True
b) False
View Answer
Explanation: When the subgroup size varies from one sample to another, U-chart is used. It controls the number of defects per unit. It is an important control chart for attributes.
8. The control chart that measures the number of non-conformities is ____ and the one that measures the number of non-conformities per unit is ______
a) R-chart, S-chart
b) C-chart, U-chart
c) P-chart, R-chart
d) R-chart, P-chart
View Answer
Explanation: The control chart that measures the number of non-conformities is C-chart and the one that measures the number of non-conformities per unit is U-chart. Both of them are important control charts for attributes along with P-chart and NP-chart.
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