GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VIII(OLD) * EXAMINATION — WINTER 2017
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Subject Code:182003 Date: 07-11-2017
Subject Name: Quality Assurance & Reliability
Time: 02:30 pm to 05:00 pm Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Explain the classification of different Quality costs with suitable examples. 07
(b) Explain 14 points of Deming’s philosophy of TQM. 07
Q.2 (a) Define Reliability. Explain its importance and state its elements. 07
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(b) 1. Explain Normal Distribution curve and its significance. 07
2. Define Quality Assurance and explain it in detail.
OR
(b) Draw a suitable control chart for the following data and give your comments. 07
Also determine the control limits for the future production.
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Lot No. | No. of defects
1 80 8
2 92 9
3 58 10
4 65 11
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5 81 126 67 13
7 55 14
No. of Lot
42 15
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56 1663 17
43 18
58 19
61 20
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50 No. defects
77
54
69
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4756
51
Q.3 (a) Explain the concept of Quality. Circle with the process of formation and its 07
working pattern.
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(b) Explain the following terms with one suitable example for each. 07
- Impossible event
- Certain event
- Complementary event
OR
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Q.3 (a) Explain the concept of Fish bone diagram in the context of quality management, 07
with a suitable example.
(b) Explain in Brief with examples: 1. MTTF 2. Random events 3. Kolmogorov’s 07
Axioms
Q.4 (a) Explain the following ISO9001 clauses; 07
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- Contract Review
- Design Review
machine. A sample of six blocks was taken each day for eight consecutive days
in series to draw this table. The block specification as designed is 15.75 +/- 0.1
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mm. Construct X-bar and Range Charts from the data available and comment
on the statistical stability of the process. Also comment on the chart patterns
observed. Calculate process capability index Cp and comment suitably
regarding the capacity of the process to produce the components as per the
design specification.
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| Day | 1st Day | 2nd Day | 3rd Day | 4th Day | 5th Day | 6th Day | 7th Day | 8th Day |
|---|---|---|---|---|---|---|---|---|
| 15.77 | 15.80 | 15.77 | 15.79 | 15.75 | 15.78 | 15.76 | 15.76 | |
| 15.80 | 15.78 | 15.78 | 15.76 | 15.78 | 15.76 | 15.78 | 15.79 | |
| 15.78 | 15.76 | 15.77 | 15.79 | 15.78 | 15.73 | 15.75 | 15.77 | |
| 15.73 | 15.70 | 15.77 | 15.74 | 15.77 | 15.76 | 15.76 | 15.72 | |
| 15.76 | 15.81 | 15.80 | 15.82 | 15.76 | 15.74 | 15.81 | 15.78 | |
| 15.75 | 15.77 | 15.74 | 15.76 | 15.79 | 15.78 | 15.80 | 15.78 |
(A2=0.483, D4=2.004, D3=0, D,=2.534)
OR
Q.4 (a) Explain the concept of ‘six sigma’ with the help of steps involved in the 07
application of the same.
(b) In a manufacturing process, the number of defectives found in the inspection of 07
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15 lots of 400 items each are given below:
| Date | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| No-of defectives | 5 | 1 | 5 | 0 | 1 | 4 | 3 | 0 | 1 | 1 | 5 | 5 | 6 | 0 | 3 |
Determine the control limits for np chart and state whether the process is in
control. Carry out one iteration if some points are falling outside the control
limits and find out new limits.
Q.5 (a) Explain the process of Audit in line with ISO9001 registration. 07
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(b) Explain bath tub curve with the help of a suitable example. 07
OR
Q.5 (a) Evaluate the statements: 07
- “Quality of design is dependent on the application of the component.”
- “Quality control and quality assurance is the same.’
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(b) Explain the concept of sampling and risks associated with sampling. 07
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