JNTU
JNTU B.Tech III ENGINEERING METROLOGY Previous Question Paper (May - 2019 - R16)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks.
PART - A
What is the purpose of limits?
Answer
The purpose of limits is to ensure the interchangeability of components by defining the maximum and minimum permissible sizes within which a part must be manufactured to function correctly in an assembly.
What is virtual size? How is it calculated?
Answer
Virtual size, or virtual effective size, is the combined effect of the actual size of a part and its geometric errors (such as form errors like straightness or circularity). It is calculated as the sum of the actual size and the geometric tolerance value for an external feature, or the difference for an internal feature.
Why is it necessary to check flatness of the measuring faces of the micrometer?
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What are the advantages of Bench micrometer over hand micrometer?
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Describe the principle of the tool maker microscope.
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What is an optical flat?
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What are the primary reasons for surface irregularities?
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What are the ISI symbols for indication of surface finish?
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List the applications of CMM.
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Distinguish between progressive pitch error and periodic pitch error.
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PART - B
Explain the concept of interchangeability.
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Explain the features of Indian standard system of limits and lists for plain work.
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Explain the unilateral system and bilateral system with a neat sketch.
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Write a brief note on industrial used and design consideration of interference fits and their uses.
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Explain about Slip gauges and its types in detail with neat sketch.
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Describe the working principle of plate type single ended progressive snap gauge.
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Explain the taper plug gauge and its types with sketches.
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Describe the measurement of angle by using rollers.
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Explain the construction and working of micrometer and microscope.
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What is the principle of optical projector and its applications?
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Enumerate the methods which are used for measuring straightness.
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Describe how Liquid surface interfometer be used to measure flatness of surface?
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How is the interferometry technique useful for measurement of surface irregularities?
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Distinguish between comparison and direct measurement of surface roughness.
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With the help of a neat sketch, explain the working of Taylor–Hobson talysurf?
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What is the need for using the truncated thread form in a NOT GO screw gauge?
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Determine the effective diameter of a metric screw using the three-wire method. The following data is available: diameter of the best size wire = 0.740 mm, distance over the wires = 25.58 mm, and pitch = 1.25 mm.
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Explain how a gear caliper enables an accurate measurement of chordal thickness of a spur gear.
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Explain alignment tests on Lathe.
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