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Sunday, 22 June 2014

Metrology&Measurement- Model question paper for B.E/B.Tech Mechanical Engineering

1(a) Distinguish between 'line standards' and 'end standards'. How are the end standards derived from line standards? (6 Marks)
(b) What is the accuracy of a vernier height gauge? Explain. (4 Marks)
(c) Sketch different types of anvils used in micrometers along with their applications. (6 Marks)
(d) A test indicator is used to check the concentricity of a shaft but its stylus is so set that its movement makes an angle of 350 with the normal to the shaft.  If the total indicator reading is 0.02 mm, calculate the true eccentricity. (4 Marks)
2(a) Explain the importance of reference planes in engineering measurement. (4 Marks)
(b) Describe the optical test for squareness with the help of a neat sketch. (6 Marks)
(c) Explain how an autocollimator can be used for straightness measurement. (6 Marks)
(d) Name the various instruments required for performing the alignment tests on machine tools. (4 Marks)
3(a) Explain with a neat diagram, the essential conditions of interference and clearance. (6 Marks)
(b) Draw the sketch of a progressive-type solid plug gauge and discuss the advantages and limitations of this type of gauging. (6 Marks)
(c) Describe some precautions to be taken in prescribing the accuracy of a limit gauge. (4 Marks)
(d) Design a suitable limit gauge confirming to Taylor's principle for checking 60H7 square hole that is 25mm wide. (4 Marks)
4(a)  Explain the construction and use of a vernier and optical bevel protector. (6 Marks)
(b) Describe the principle of an angle-dekkor and mention its various uses. (6 Marks)
(c)  Describe optical flats along with their types. (4 Marks)
(d) A 1.5 mm surface is being measured on an interferometer. A lamp is used which emits wavelength as follows: Red-842 nm, Blue-662.8 nm. Calculate the nominal fractions expected for the gauge for the two wavelengths. (4 Marks)
5(a) Describe the essential characteristics of a good comparator. (4 Marks)
(b) Explain the basic methods of magnifications and explain any one in detail by drawing its sketch. (8 Marks)
(c) Discuss the consequences of not specifying the sampling length in surface-roughness measurement. (4 Marks)
(d) Write a short note on grades for specifying the surface texture. (4 Marks)
6(a) What is best-size wire? Calculate the diameter of the best wire for an M 20 x 25 screw. (4 Marks)
(b) Explain gear tooth profile measurement using an involute measuring machine. (6 Marks)
(c) Describe how rollers, balls and slip gauges can be used to measure a taper plug gauge and taper ring gauge. (6 Marks)
(d) When  measuring the major diameter of an external screw thread gauge, a 35 mm diameter cylindrical standard was used. The micrometer readings over a standard gauge were 9.3768 mm and 11.8768 mm respectively. Calculate the thread-gauge major diameter. (4 Marks)
7(a) Explain the concept of adaptive machining combined with inspection system. (4Marks)
(b) Define drift and explain its types. (4 Marks)
(c) Explain with the help of a neat sketch, how a Linear Variable Differential Transformer (LVDT) is used for displacement measurement. State its advantages and limitations. (8 Marks)
(d) Explain the use of a slip ring for measuring torque. (4 Marks)
8(a) Explain how the stroboscope can play the role of the instrument to be used for vibration measurement. (4 Marks)
(b) Write short notes on Bourdon tube and pyrometry. (6 Marks)
(c) Discuss the characteristics of quarter-bridge strain-gauge sensors. (4 Marks)
(d) Explain any one positive displacement flowmeter in detail using a sketch. (6 Marks)

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