Question Paper: Mechanical Measurement and Metrology : Question Paper Jun 2013 - Mechanical Engineering (Semester 3) | Visveswaraya Technological University (VTU)
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## Mechanical Measurement and Metrology - Jun 2013

### Mechanical Engineering (Semester 3)

TOTAL MARKS: 100
TOTAL TIME: 3 HOURS
(1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks.
1 (a) What is metrology? State the objectives of metrology.(6 marks) 1 (b) Briefly explain limits, fits and tolerances.(6 marks) 1 (c) Using M112 set of slip guages, build the following dimesions:
(i) 52.498
(ii) 48.3275
(8 marks)
2 (a) Explain universal interchangebility and selective assembly.(6 marks) 2 (b) What do you understand by line and end standard? Explain wavelength standard.(6 marks) 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)<sup1>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.</sup1>
(8 marks)
3 (a) What is a comparator? Explain Johnson Mikrokartor comparator with a neat sketch.(6 marks) 3 (b) What are the advantages of electrical comparators? Explain the principle of optical comparator.(7 marks) 3 (c) Describe with a neat sketch, the construction and working of LVDT.(7 marks) 4 (a) Explain with neat sketch the terminology of screw therads.(6 marks) 4 (b) Explain the principle of autocolimator with a neat sketch.(6 marks) 4 (c) Derive an expression for the effective diameter of a screw thread by 3-wire method.(8 marks) 5 (a) Explain the suitable examples, the three stages of measurement system.(6 marks) 5 (b) Define :-
(i) Calibration
(ii) Precision
(iii) Accuracy
(iv) Sensitivity
(v) Linearity.
(10 marks)
5 (c) Compare electrical and mechanical transducers.(4 marks) 6 (a) Explain with a sketch, the principle of :-
(i) piezo-electric transducer
(ii) ionization transducer
(8 marks)
6 (b) Explain with a block diagram, the general telemetering system.(6 marks) 6 (c) Explain the working of:
(i) stylus type oscillograph
(ii) x-y plotter
(6 marks)
7 (a) Explain with a neat sketch, multiple lever platform balance.(6 marks) 7 (b) What are the types of dynamometers? Explain with a neat sketch, hydraulic dynamometer.(8 marks) 7 (c) Explain the operation of McLeod gauge and Pirani gauge. (6 marks) 8 (a) What are the methods of strain measurement? Explain the principle of electrical resistance strain guage.(6 marks) 8 (b) What is a thermocouple? Briefly explain the lawas of thermocouple.(6 marks) 8 (c) Write notes on:
(i) Strain gauge factor
(ii) Temperature compensation
(iii) Cross sensitivity
(iv) Strain guage bonding materials
(8 marks)