Question Paper: Mechanical Measurement And Metrology : Question Paper May 2016 - Mechanical Engineering (Semester 4) | Gujarat Technological University (GTU)
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## Mechanical Measurement And Metrology - May 2016

### Mechanical Engineering (Semester 4)

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.

### Short Questions

1(a) Define (i) Precision (ii) Accuracy(1 marks) 1(b) List out various sources of errors in measurement.(1 marks) 1(c) Explain Indirect Method of measurement.(1 marks) 1(d) Define Least count of an instrument with example.(1 marks) 1(e) State the different use of Telescopic gauge.(1 marks) 1(f) Define Comparators.(1 marks) 1(g) Define following terms related to screw thread measurement:
(i) Lead, (ii) Pitch, (iii) Crest
(1 marks)
1(h) Define Pitch circle diameter.(1 marks) 1(i) Define terms: (i) Primary texture (ii) Secondary Texture.(1 marks) 1(j) Explain Dead zone and Drift.(1 marks) 1(k) List out different standards to calibrate thermocouple.(1 marks) 1(l) Give the classifications of Tachometers.(1 marks) 1(m) Define: (i) Resolution (ii) Threshold.(1 marks) 1(n) Explain Range and Span(1 marks) 2(a) Explain any one Method used for force measurement.(3 marks) 2(b) Explain Radiation Pyrometer.(4 marks)

### Solve any one question from Q.2(c) & Q.2(d)

2(c) Describe construction, working principle and applications of Vernier height gauge.(7 marks) 2(d) Describe with sketch the construction and working of sigma comparator.(7 marks)

### Solve any three question from Q.3(a), Q.3(b), Q.3(c) & Q.3(d), Q.3(e), Q.3(f)

3(a) Explain construction and applications of Micrometer clinometer.(3 marks) 3(b) List out various elements to be checked for accuracy of gear and describe any two.(4 marks) 3(c) Explain pneumatic comparator and state the advantages and Disadvantages(7 marks) 3(d) List out various characteristics of good comparators.(3 marks) 3(e) Explain proving ring with sketch.(4 marks) 3(f) Discuss the gear tooth terminology with neat sketch.(7 marks)

### Solve any three question from Q.4(a), Q.4(b), Q.4(c) & Q.4(d), Q.4(e), Q.4(f)

4(a) Write a short note on: Spirit level(3 marks) 4(b) Explain hemispherical bore gauge with applications.(4 marks) 4(c) Discuss the elements of screw thread with neat sketch.(7 marks) 4(d) Explain adverse effect of poor surface finish.(3 marks) 4(e) Write a short note on: International temperature scale (ITS).(4 marks) 4(f) Explain the construction and working of bourdon tube pressure gauge with neat sketch.(7 marks)

### Solve any three question from Q.5(a), Q.5(b), Q.5(c) & Q.5(d), Q.5(e), Q.5(f)

5(a) List out the various applications of Bimetallic thermometer.(3 marks) 5(b) Why sine bar is not preferred for angles greater than 45° ? Explain.(4 marks) 5(c) Discuss the construction and working of thermocouple with neat Sketch.(7 marks) 5(d) Explain Light wave length standard.(3 marks) 5(e) Explain the flash light stroboscope.(4 marks) 5(f) Explain optical pyrometer with neat sketch.(7 marks)