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VTU Mechanical Engineering (Semester 3)
Mechanical Measurement and Metrology
December 2015
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) What is Metrology? State any four objectives of metrology.
6 M
1 (b) Describe with a neat sketch, International Prototype meter.
6 M
1 (c) Discuss the important features of wavelength standard.
4 M
1 (d) Build 49.3115mm using M112 set of slip gauges.
4 M

2 (a) Define the following terms:
i) Limits ii) Fits iii) Tolerance iv) Deviation.
4 M
2 (b) Differentiate between interchangeability and selective assembly.
6 M
2 (c) Explain with a sketch, Taylor's principle for design of limit gauges.
6 M
2 (d) What is Wear allowance? How it is applied in design of gauges?
4 M

3 (a) What are the required characteristics of comparators?
4 M
3 (b) With neat sketch, describe the construction and principle of working of sigma comparator.
12 M
3 (c) Give the combination of angle gauges to obtain 57° 34' 9'' angle.
4 M

4 (a) Illustrate the principle of Interferrometry, with sketches.
6 M
4 (b) What is best wire size? Derive an expression for the same.
6 M
4 (c) With a sketch, explain the construction of a tool Maker's microscope. What are its applications?
8 M

5 (a) What is the significance of measurement system?
4 M
5 (b) Define the following terms used with reference to measurement:
i) Accuracy ii) Precision iii) Calibration iv) Threshold v) Sensitivity vi) Hysteresis.
6 M
5 (c) Mention any four mechanical and four electrical transducers.
4 M
5 (d) Define an error. How errors are classified? Give reasons for each type of error during measurement.
6 M

6 (a) Describe in detail a ballast circuit.
8 M
6 (b) With a sketch, explain the construction and important parts of a cathode ray oscilloscope.
8 M
6 (c) What are the primary functions of a terminating devices?
4 M

7 (a) Explain with a sketch, working of proving ring.
6 M
7 (b) Explain the working principle of hydraulic dynamometer used for torque measurement.
8 M
7 (c) Describe with a neat sketch, McLeod Vacuum gage.
6 M

8 (a) What is a Thermocouple? State the laws of thermocouple.
8 M
8 (b) Describe the construction and working of optical pyrometer.
8 M
8 (c) Write short note on gauge factor.
4 M

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