# Statistical Quality Control - Mechanical Engineering (MCQ) questions and answers

1)   Which of the following gives actual measurement of any specific dimension?

a. Inspection by variables
b. Inspection by attributes
c. Both a. and b.
d. None of the above
 Answer  Explanation ANSWER: Inspection by variables Explanation: No explanation is available for this question!

2)   Which among the following is a type of control chart for variables?

a. C chart
b. P chart
c. X chart
d. U chart
 Answer  Explanation ANSWER: X chart Explanation: No explanation is available for this question!

3)   The distribution of measured data can be studied by using

a. X chart
b. R chart
c. both X and R chart
d. None of the above
 Answer  Explanation ANSWER: both X and R chart Explanation: No explanation is available for this question!

4)   Match the following group 1 (charts) with group 2 (use) and select the correct option.

1. R chart ----------------------------------------------- A. study the number of defects per unit
2. C chart ----------------------------------------------- B. size of variable is studied
3. P chart ----------------------------------------------- C. dispersion of measured data
4. X chart ----------------------------------------------  D. defective units produced per subgroup

a. 1 – A, 2 – B, 3 – D, 4 - C
b. 1 – C, 2 – D, 3 – B, 4 - A
c. 1 – A, 2 – D, 3 – B, 4 - C
d. 1 – C, 2 – A, 3 – D, 4 - B
 Answer  Explanation ANSWER: 1 – C, 2 – A, 3 – D, 4 - B Explanation: No explanation is available for this question!

5)   Which of the following statements is true?

1. P and nP charts cannot use limit gauges
2. P charts are difficult to understand
3. P charts cannot recognize different degrees of defectiveness in units

a. Only 1
b. Only 2
c. Only 3
d. All the statements are true
 Answer  Explanation ANSWER: Only 3 Explanation: No explanation is available for this question!

6)   Sample size of 1 m2 is observed in which type of chart?

a. C chart
b. P chart
c. nP chart
d. R chart
 Answer  Explanation ANSWER: C chart Explanation: No explanation is available for this question!

7)   Which control chart pattern is/are used for assignable causes?

a. Trend pattern
b. Shift pattern
c. Extreme variation pattern
d. All of the above
 Answer  Explanation ANSWER: All of the above Explanation: No explanation is available for this question!

8)   Which of the following statements is/are true?

1. Trend type of control chart pattern shows continuous movement of points upwards and downwards
2. Trend pattern occurs due to change in inspection method
3. Downward trend indicates wear of parts

a. Only 1
b. Only 2
c. Only 3
d. All of the above
 Answer  Explanation ANSWER: Only 1 Explanation: No explanation is available for this question!

9)   What is capability ratio?

a. The ratio of process capability and number of units inspected
b. The ratio of specification range and process capability
c. The ratio of number of defectives and process capability
d. The ratio of number of defectives and number of units inspected
 Answer  Explanation ANSWER: The ratio of specification range and process capability Explanation: No explanation is available for this question!

10)   What is the graph (frequency vs cell) shown below called as? a. Bar diagram
b. Frequency histogram
c. Frequency bar chart
d. None of the above
 Answer  Explanation ANSWER: Frequency histogram Explanation: No explanation is available for this question!