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VTU Mechanical Engineering (Semester 3)
Mechanical Measurement and Metrology
January 2014
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) Define metre in terms of wavelength standards. List the advantages of wavelength standards over material standards.
6 M
1 (b) Describe with a neat sketch:
(i) Imperial standard yard
(ii) Wringing phenomena of slip guages
8 M
1 (c) Four length bars of basic length 100 mm are to be calibrated using a calibrated length bar of 400 mm whose actual length is 399.9992 mm. It was also found that length of bars B, C and D in comparison to A are +0.0002 mm, +0.0004 mm and -0.0001 mm respectively and the length of all the four bars put together in comparison to standard calibrated bar is +0.0003 mm longer. Determine the actual dimensions of all the four end bars.
6 M

2 (a) Defferentiate between:
(i) Hole basis and shaft basis system of tolerances
(ii) Interchangeability and selective assembly
8 M
2 (b) Write notes on:
(i) Compound tolerances
(ii) Gauge tolerance.
4 M
2 (c) Determine the dimensions of hole and shaft for a fit 30H8f7. The given data are: i=0.45D1/3 + 0.001D, IT8=25i, IT7=16i. Fundamental derivation of shaft 'f' is -5.5D0.41 30 mm diameter lies in the diameter step of 18-30 mm. sketch the fit and comment on the same.
8 M

3 (a) Explain with a neat sketch, the working of Solex pneumatic gauge.
8 M
3 (b) Explain with a neat sketch, the construction and working of LVDT.
8 M
3 (c) Show the arrangement of a angle guage, with a neat sketch by selecting minimum number of guages for the angles 30°15'33" and 54°63'42"
4 M

4 (a) What is the best size wire? Derive an expression for the same in terms of the pitch and angle of the thread.
6 M
4 (b) Explain 3-wire method of measuring effective diameter of screw therad.
8 M
4 (c) Explain the principle of interferrometry. Write a note on optical flat.
6 M

5 (a) With a neat block diagram, explain the generalized measurement system with an example to each stage.
8 M
5 (b) Distinguish between:
(i) Primary and secondary transducer
(B) Active and passive transducer
6 M
5 (c) Define the following terms with reference to measurement system:
(i) Calibration
(ii) Sensitivity
(iii) Hysterisis
(iv) Threshold value
6 M

6 (a) With a neak sketch, explain the working principle of a CRO
8 M
6 (b) State the advantages of electrical signal conditioning elements
6 M
6 (c) Explain with a neat sketch, Ballast circuit diagram.
6 M

7 (a) With a neat sketch, describe the Pirani guage used for pressure measurement
8 M
7 (b) With a neat sketch, explain the working principle of proving ring.
6 M
7 (c) Explain with a suitable daigram, the working of hydraulic dynamometer.
6 M

8 (a) Sketch ans explain the working principle of optical pyrometer
8 M
8 (b) Describe 'he step to be taken for the preparation of specimen and mounting of strain guages.
6 M
8 (c) What is a thermocouple? State the laws of thermocouple.
6 M

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