 MORE IN Mechanical Measurement and Metrology
VTU Mechanical Engineering (Semester 3)
Mechanical Measurement and Metrology
June 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) Define the term metrology. List and explain the objectives of metrology.
10 M
1 (b) Explain with neat sketch: i) Imperial standard yard
ii) International prototype meter.
10 M

2 (a) Determine the tolerances on the hold and the shaft for a precision running bit designated by 50H7G6 Given:
i) 50mm lies between 30-50mm
ii) i(microns)=0.45(D)113+0.001D
iii) Fundamental deviation for 'g' shift= -2.5 D0.34
iv) IT7= 16i
v) IT6=10i.
12 M
2 (b) Explain with neat sketches hole basis system and shaft basis system.
8 M

3 (a) Explain with a neat sketch the working of sigma comparator.
10 M
3 (b) Explain with a neat sketch the construction and working of a LVDT.
10 M

4 (a) Explain with a neat sketch, Auto collimetor.
10 M
4 (b) What are the various characteristics that you would measure in a crew thread? Explain 3 wire method of measuring effective diameter of screw thread.
10 M

5 (a) With a block diagram, explain generalized measuring system with examples.
10 M
5 (b) Define the following terms: i) Calibration ii) Sensitivity iii) Hysteresis iv) Repeatability v) Accuracy.
10 M

6 (a) With a neat sketch, explain the working principle of a CRO.
10 M
6 (b) With a neat sketch, explain X-Y plotter and list the advantages.
10 M

7 (a) With a neat sketch, explain 'Hydraulic Dynomometer'.
10 M
7 (b) With a neat sketch McLeod gauge.
10 M

8 (a) What is a Thermocouple? State the laws of Thermocuple.
8 M
8 (b) Sketch and explain the working principle of optical pyrometer.
12 M

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