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Metrology and Surface Engineering Exam - II Semester, B.Tech, April/May 2008, Exams of Mechanical Engineering

The question paper for the metrology and surface engineering exam held in the ii semester of the b.tech program in april/may 2008. The exam consists of five questions, each carrying equal marks, and the total marks are 80. The topics covered include the use of a vernier micrometer, taylor's principle of limit gauging, optical projector, comparators, and screw threads, as well as alignment tests on a pillar drilling machine and the principles of dip coating and spray coating.

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2010/2011

Uploaded on 09/24/2011

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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
? ? ? ? ?
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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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 ?????

  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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