Code No: R05320302 Set No. 4
III B.Tech II Semester Regular Examinations, Apr/May 2008
METROLOGY AND SURFACE ENGINEERING
(Mechanical Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
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1. (a) With the help of sketch describe a vernier type micrometer. How do you
calculate its least count?
(b) Why is it necessary to check the flatness of the measuring faces of a micrometer
and explain with an example? [8+8]
2. Explain the Taylor’s principle of limit gauging, with reference to gauging of rectan-
gular holes. Discuss the effect of violating the Taylor’s principle? [16]
3. (a) What are the measuring techniques employed in optical projector?
(b) Discuss the most common aberrations found in optical projector? [8+8]
4. What are the requirements of a good comparator? Explain, with the help of a neat
sketch how these features are achievable in the “Sigma Comparator”. [16]
5. (a) How is Taylor’s principle of limit gauging applicable to gauging of screw
threads.
(b) What are the elements required to be measured for determination of the ac-
curacy of screw threads? Explain. [8+8]
6. Describe the following alignment tests on a pillar drilling machine.
(a) Square ness of the spindle axis with table.
(b) Perpendicularity of drill guide to the table. [8+8]
7. Explain with the help of sketches the working principles of the instruments used in
checking of profile and base pitch of the gear. [16]
8. Explain the terms Dip coating and Spray coating. Distinguish between these two
processes. Compare the merits and demerits. [16]
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