B.E. 4/4 (AE) II-Semester (Main) Examination, April / May 2013 Subject : Quality Control and Reliability Engineering Time : 3 Hours
Max. Marks: 75
Note: Answer all questions of Part - A and answer any five questions from Part-B. PART – A (10x2.5=25 Marks) 1. Explain briefly basic concepts of quality. 2. Explain process capability. 3. Explain 'p' and 'c' chart. 4. Define SQC 5. Explain Quality costs 6. Define AQL, LTPD 7. Define Reliability, Mean time to failure 8. Sketches the product development process. 9. Differentiate between variables and attributes 10. Describe O-C curve PART – B (5x10=50 Marks) 11.(a) Explain benefits and limitations of SQC. (4) (b) Plot the control charts for X and R. Using the following sample data and a sample size of '5'(five) from the chart find out whether the process is in control. (6) Sample 1 2 3 4 5 6 7 8 9 10 166 165 168 166 167 169 168 168 167 166 X R 23 8 22 12 7 8 15 6 7 12 12.(a) What are the sources of assignable causes of variation on in quality control? (b) Explain 'comments concerning Cp and CPK' with neat sketches.
(4) (6)
13.(a) The Piston rings are produced in batches of 100. The inspection results of the 15 batches is as follows. Using 'np' chart analysis the manufacturing process. (5) Batch 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Defects 15 20 35 18 27 10 12 18 15 25 30 16 19 20 25 (b) Explain product life cycle.
(5)
14.(a) Explain double sampling plan. (b) For n=20 and c=2 construct O-C curve and find the producers risk at AQL of 5 percent.
(4)
15.(a) Explain briefly the Reliability improvement techniques. (b) Explain Information flow during product cycle.
(5) (5)
16.(a) Explain 'Maintainability' and 'Availability'. (b) The components are arranged as follows in the system.
(4) (6)
Supplier Reliability of components Components
A B C
1
2
(6)
3
0.95 0.92 0.94 0.80 0.86 0.9 0.90 0.93 0.85
Based on the above data, which one of the supplier should be choosen? Consideration is the maximum possible reliability. 17. Write short notes on of the following: (a) Product Life Cycle (b) Dexating (c) System reliability in series and parallel system *****
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