MU Mechanical Engineering (Semester 6)
Metrology & Quality Engineering
December 2015
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary


1 (a) Differentiate between precision and accuracy.
5 M
1 (b) What do you mean by quality of design?
5 M
1 (c) What do you mean by waviness and roughness?
5 M
1 (d) Explain advantages and limitations of pneumatic comparators.
5 M

2 (a) Explain Taylors Principle of Gauge design with suitable example.
5 M
2 (b) Explain principle, construction and working of Parkinson's Gear Tester.
10 M

3 (a) Explain principle of interference. How flatness can be checked with the help of optical interferometer.
10 M
3 (b) How will compromise between quality and cost. Explain different types of cost of quality with suitable examples.
10 M

4 (a) Explain following terms with respect to surface roughness parameters -
i) Ra
ii) Rz
iii) RMS
10 M
4 (b) Control Chart for X and R are kept on the weight in kilograms of a colour pigment for a batch process. After 25 subgroups with subgroup size of 4.
\( \sum \overline{x}=52.08 \ kg \\ \sum R=11.82 \)
Assuming process is in state of control, Compute the X and R chart central line and control limits.
(For subgroup size of 4, A2=0.729 D4=2.282 D3=0 d2=2.059).
10 M

5 (a) Explain two wire method used in screw thread measurement.
10 M
5 (b) Explain various modern SQC tools.
10 M

6 (a) Explain single and double samplings plans. Also explain concept of OC curves.
10 M
6 (b) Explain construction and working and applications of 3D coordinate measuring machine.
10 M



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