JNTU
JNTU B.Tech III ENGINEERING METROLOGY Previous Question Paper (August/September - 2024 - R13)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
Write the differences between the unilateral and bilateral system.
Answer
In a unilateral system, the tolerance is allowed only on one side of the basic size (e.g., +0.05/0.00 mm). In a bilateral system, the tolerance is distributed on both sides of the basic size (e.g., +0.025/-0.025 mm).
Explain the need for providing tolerance on a dimension.
Answer
It is physically impossible to manufacture parts to an exact dimension due to machine inaccuracies, tool wear, and material variations. Providing tolerance ensures interchangeability, reduces production costs by allowing acceptable variations, and ensures the functional fit and performance of mating components.
Discuss the various standards of linear measurement.
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How spirit level operates?
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State the principle of interference.
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What is the role of optical flat in Metrology?
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Elaborate the importance of surface roughness in Manufacturing.
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Define (i) CLA value (ii) Maximum peak to valley height (iii) Sampling length.
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Give the applications of Pneumatic comparator.
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State the role of CMM and its applications in quality production.
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Part B
Distinguish between hole basis system and shaft basis system.
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Determine the dimensions and tolerances of the shaft and hole having the size of 25H7/f8. 25 mm falls in diameter steps of 18 - 30. Also indicate the type of fit and show the tolerances with sketch. The fundamental deviation for shaft ‘f’ is - 5.5D^0.41 . The standard tolerance for IT7 = 16i and IT8 = 25i, where ‘i’ is standard tolerance unit.
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What is selective assembly. Give one practical example.
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Explain briefly different types of fits with necessary sketches.
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What are the requirements of a good dial indicator? Sketch a dial indicator and explain its operation.
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Sketch a double ended plug gauge and progressive plug gauge. What are the advantage and disadvantages of one over the other?
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How calibration of slip gauges are made? State the applications of angle slip gauges.
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Explain the method of taper angle measurement using sine bar and slip gauges.
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Describe with a neat sketch the working principle of a Autocollimator.
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Briefly discuss about Straight edges and their applications.
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What are the numerous fringe contours in checking slip gauges by means of optical flats? Describe the method of experimental testing of such surfaces.
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Explain briefly about optical projector with a neat sketch.
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State the difference between surface roughness and surface waviness.
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Explain the working principle of Talysurf with a neat diagram and state the limitations.
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Sketch various ISI symbols for indication of surface finish.
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Discuss in detail various numerical assessment of surface finish methods.
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Discuss in detail working of Mechanical Comparator with a neat sketch.
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What are the various Alignment tests performed on a drilling machine?
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Explain the methods of measurement of effective diameter and angle of screw thread.
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How pressure angle and tooth thickness of a gear is measured?
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