Reg ‏سنن‎ 03000ME3120520032"°:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Sixth semester B.Tech degree examinations (S), September 2020

Course Code: ME312
Course Name: METROLOGY AND INSTRUMENTATION
Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any three full questions, each carries 10 marks. Marks
1 ஐ Distinguish between relative error and random error. (4)
b) Explain how the measurements are made with universal bevel protractor. (4)
c) Write any two precautions to be followed when using a gauge block. (2)
2 a) Explain briefly the construction and working of a height gauge. (5)
b) Explain with the help of a diagram the principle of a sine bar. (5)

3 a) Differentiate hole basis and shaft basis systems of tolerance, which system is (6)

used most and why?

b) Explain the following gauges (1) snap gauges (2) plug gauges (4)
4 a) Write any four characteristics of Laser. (4)
b) Describe the working of optical flat with neat sketch. (4)
c) State the principle of interferometry. (2)
PART छ
Answer any three full questions, each carries 10 marks.
5 9) Discuss the procedure involved in a profile projector to project the images. (4)
b) Explain the measurement of major and minor diameters of a screw thread. (6)
6 ച With the help of a neat sketch describe the working of a profilometer. (5)
b) Explain the principle and working of Autocollimator. (5)
7 93) Discuss any two alignment tests carried out in lathe machine with neat sketch. (6)
b) List the various geometrical checks made on machine tools (4)
8 a) What are the four basic steps of machine vision system? Explain any one. (4)
b) Explain the construction and principle of CMM. (4)
c) Mention the disadvantages of CMM. (2)

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