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Reg No.: Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
SIXTH SEMESTER B.TECH DEGREE EXAMINATION(S), DECEMBER 2019

Course Code: ME312
Course Name: METROLOGY AND INSTRUMENTATION

Pages:2

Max. Marks: 100 Duration: 3 Hours
PART A

Answer any three full questions, each carries 10 marks. Marks

1 a) Why do we go for highly precise measuring instruments? (3)
b) What 15 meant by calibration and precision of an instrument? (3)

௦) Differentiate between the line standards and the end standards. (4)

2 a) Whatis the advantage of using the wavelength standard? (3)
b) What is meant by wringing of slip gauges? (3)

c) Explain how Sine bar is used for measurement of small size component and (4)

large size component

3 a) Witha neat sketch explain Johansson Mikrokator. (4)
b) Explain the working of a laser interferometer (3)

௦) What 15 meant by the hole basis system and the shaft basis system. (3)

4 a) Write the difference between inspection gauges and workshop gauges? (3)
b) Differentiate between clearance fit and interference fit. (3)

௦) What 15 meant by work tolerance and gauge tolerance? (4)

PART B
Answer any three full questions, each carries 10 marks.
5 2) Explain the measurement of effective diameter of a screw thread with two wire (3)
method.

b) Explain the measurement of flank angle by profile projector. (3)

c) What is the meaning of surface texture, roughness and waviness? (4)

6 a) Whatis Ra, Rt and Rz values in surface roughness? (3)
b) Witha neat sketch explain the working of a Talysurf. (3)

c) Witha neat sketch explain the working of an autocollimator. (4)

7 2) Explain the alignment testing of a drilling machine. (3)
b) Explain the components and construction of a Co-ordinate Measuring Machine. (4)

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