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Metrology And Quality Control Question Paper - Jun 18 - Mechanical Engineering (Semester 5) - Pune University (PU)
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Metrology And Quality Control - Jun 18
Mechanical Engineering (Semester 5)
Total marks: 70
Total time: 3 Hours
INSTRUCTIONS
(1) Question 1 is compulsory.
(2) Attempt Q1 or Q2, Q3 or Q4, Q5 or Q6, Q7 or Q8, Q9 or Q10.
(3) Draw neat diagrams wherever necessary.
1.a.
Differentiate between Precision \& Accuracy with Suitable examples.
(5 marks)
00
1.b.
Draw a neat sketch of micrometer $\&$ how to calculate least count of
micrometer, give one example.
(5 marks)
00
OR
2.a.
Explain any one method of assessing the surface finish.
(5 marks)
00
2.b.
Explain tool makers microscope $\&$ their application.
(5 marks)
00
3.a.
Explain laser interferometer $\&$ its application.
(5 marks)
00
3.b.
Write short note on machine vision system.
(5 marks)
00
OR
4.a.
State \& Explain Taylor's principle of gauge design with example.
(5 marks)
00
4.b.
Explain method of measuring effective diameter using two wires with neat
sketch.
(5 marks)
00
5.a.
Explain Jurans triology approach with diagram.
(8 marks)
00
5.b.
State seven new quality tools. Explain any three in detail.
(8 marks)
00
OR
6.a.
What is cost of quality? Explain Cost of failure, cost of appraisal $\&$
cost of prevention.
(8 marks)
00
6.b.
What is initial planning for quality? Explain in details.
(8 marks)
00
7.a.
What are advantages of sampling inspection over 100$\%$ inspection?
Explain the difference between single sampling $\&$ double sampling plan.
(8 marks)
00
7.b.
Following is the record for successive lots of part being produced by
plastic molding press. As each lot is come off the line a random sample
of 150 pieces were inspected (results are expressed to the nearest 0.1$\% )$
Calculate $\overline{p},$ Control limits $\&$ plot control chart and comment.
(8 marks)
00
| Lot no | Sample size | No. of defectives |
|---|---|---|
| 1 | 150 | 4 |
| 2 | 150 | 8 |
| 3 | 150 | 2 |
| 4 | 150 | 4 |
| 5 | 150 | 4 |
| 6 | 150 | 6 |
| 7 | 150 | 10 |
| 8 | 150 | 4 |
| 9 | 150 | 6 |
| 10 | 150 | 8 |
OR
8.a.
Write short note on OC curve $\&$ its characteristics.
(8 marks)
00
8.b.
Explain single sampling plan with flow chart. For the given data
calculate sample size and AOQ for single sampling plan.
(8 marks)
00
i) Probability of acceptance for 0.3$\%$ defectives in a lot is 0.558
ii) Lot size $\mathrm{N}=10000$ units
iii) $\mathrm{np}^{\prime}=1.5$
iv) Acceptance number $\mathrm{c}=1$
v) Defectives found in the sample are not to be replaced
Write short note on (Any three):
9.a.
Kanban
(6 marks)
00
9.b.
Zero defects
(6 marks)
00
9.c.
FMECA
(6 marks)
00
9.d.
TS-16949
(6 marks)
00
9.e.
Quality audit
(6 marks)
00
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