VTU Mechanical Engineering (Semester 3)
Mechanical Measurement and Metrology
June 2014
Total marks: --
Total time: --
(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) Sketch and explain the following
i) Imperial standard.
ii) International prototype.
8 M
1 (b) Discuss the following standards of measurements with their characteristics:
i)Line standard
ii) END standard
8 M
1 (c) What are the major requirement of slip gauges?
4 M

2 (a) Define the following with sketch:
i) Nominal size
ii) Basic size
iii) Actual size
iv) Zero line
v) Allowance.
9 M
2 (b) Differentiate between Hole basis and shaft basis system with sketch
7 M
2 (c) How the plain gauges are classified ?
4 M

3 (a) List the characteristics of a comparator.
6 M
3 (b) Explain with sketch the principle of a sine bar.
6 M
3 (c) Give the combination of angle gauges to obtain the following angles also sketch the arrangement of gauges : i)37°9' 18''; ii)33° 16' 42''.
8 M

4 (a) Describe with sketch 3-wire method of measuring effective diameter of the thread
10 M
4 (b) Explain with sketch measurement of tooth thickness of a spur gear using gear tooth vernier calliper.
10 M

5 (a) What is measurement? Explain the fundamental methods of measurement.
6 M
5 (b) Explain
i) Repeatability
ii) Sensitivity
iii) Hysteresis
6 M
5 (c) With suitable example, explain the stage of generalized measurement system.
8 M

6 (a) Explain with block diagram working of a general purpose oscilloscope.
10 M
6 (b) Explain with sketch
i) Stylus type oscillograph
ii) Light beam oscillograph
10 M

7 (a) Describe with a neat sketch the working and application of proving ring.
6 M
7 (b) With a neat sketch, explain the working of hydraulic dyanamometer for the measurement of torque.
7 M
7 (c) Explain the Bridgemen gauge with a neat sketch.
7 M

8 (a) Write a note on thermocouple materials.
3 M
8 (b) With a neat sketch, explain working of a optical pyrometer.
8 M
8 (c) Show with sketch how the strain gauges are mounted to measure in the following cases:
i) Axial strain only
ii) Bending strain only.
iii) Torsion strain only.
9 M

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