 MORE IN Mechanical Measurement and Metrology
VTU Mechanical Engineering (Semester 3)
Mechanical Measurement and Metrology
June 2013
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 the objectives of metrology.
6 M
1 (b) Briefly explain limits, fits and tolerances.
6 M
1 (c) Using M112 set of slip guages, build the following dimesions:
(i) 52.498
(ii) 48.3275
8 M

2 (a) Explain universal interchangebility and selective assembly.
6 M
2 (b) What do you understand by line and end standard? Explain wavelength standard.
6 M
2 (c) Determine the tolerances on the hole and the staff for a precision running fit designated by 50 H7g6 Given:
(i) 50 mm lies between 30-50 mm
(ii) i(microns)=0.45(D)1/3+0.001D
(iii) Fundamental deviation for 'H' hole=0
(iv) Fundamental deviation for 'g' shaft= -2.5 D0.34
(v) 1T7=16i
(vi) 1T6=10i
State the actual maximum and minimum sizes of the hole and shaft and maximum and minimum clearances.
8 M

3 (a) What is a comparator? Explain Johnson Mikrokartor comparator with a neat sketch.
6 M
3 (b) What are the advantages of electrical comparators? Explain the principle of optical comparator.
7 M
3 (c) Describe with a neat sketch, the construction and working of LVDT.
7 M

4 (a) Explain with neat sketch the terminology of screw therads.
6 M
4 (b) Explain the principle of autocolimator with a neat sketch.
6 M
4 (c) Derive an expression for the effective diameter of a screw thread by 3-wire method.
8 M

5 (a) Explain the suitable examples, the three stages of measurement system.
6 M
5 (b) Define :-
(i) Calibration
(ii) Precision
(iii) Accuracy
(iv) Sensitivity
(v) Linearity.
10 M
5 (c) Compare electrical and mechanical transducers.
4 M

6 (a) Explain with a sketch, the principle of :-
(i) piezo-electric transducer
(ii) ionization transducer
8 M
6 (b) Explain with a block diagram, the general telemetering system.
6 M
6 (c) Explain the working of:
(i) stylus type oscillograph
(ii) x-y plotter
6 M

7 (a) Explain with a neat sketch, multiple lever platform balance.
6 M
7 (b) What are the types of dynamometers? Explain with a neat sketch, hydraulic dynamometer.
8 M
7 (c) Explain the operation of McLeod gauge and Pirani gauge.
6 M

8 (a) What are the methods of strain measurement? Explain the principle of electrical resistance strain guage.
6 M
8 (b) What is a thermocouple? Briefly explain the lawas of thermocouple.
6 M
8 (c) Write notes on:
(i) Strain gauge factor
(ii) Temperature compensation
(iii) Cross sensitivity
(iv) Strain guage bonding materials
8 M

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