JNTU
JNTU B.Tech III METROLOGY AND MACHINE TOOLS Previous Question Paper (July/August - 2023 - R16)
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
Define shear angle and Chip thickness ratio.
Answer
The shear angle is the angle between the shear plane and the direction of tool travel. The chip thickness ratio (r) is the ratio of the uncut chip thickness (t) to the actual chip thickness (tc) after deformation, expressed as r = t / tc.
Classify different types of chips and write its favorable factors for chip formations.
Answer
Chips are classified as continuous, discontinuous, and continuous with built-up edge (BUE). Favorable factors include: for continuous chips, ductile materials and high cutting speeds; for discontinuous chips, brittle materials and low cutting speeds; and for BUE, high friction and low cutting speeds.
Differentiate Counter boring and Counter sinking.
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How do you specify a drilling machine?
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Define Indexing and write its significance.
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Enumerate different types of bonds used in grinding wheel.
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Compare a unilateral and bilateral system of tolerances.
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State Taylor’s Principle.
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Write the significance of coordinate measuring machine.
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Write the different methods employed in measurement of surface finish.
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Part B
Explain in detail the geometry and Nomenclature of a single point cutting tool.
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Classify different types of lathes and explain the construction and working of capstan lathe with a suitable diagram.
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Explain Merchants forces circle diagram and derive the expressions for different forces.
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Explain in detail the different cutting parameters in turning operation.
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Explain in detail the geometry and Nomenclature of a twist drill with a suitable sketch.
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Explain in mechanism of quick return in shaping machine with a suitable sketch.
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With the help of a neat sketch, explain the construction of planer machine.
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Explain in detail the construction and working of radial drilling machine and write its specifications.
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Classify different types of milling machines and explain any one in detail.
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Compare and Contrast lapping and honing processes.
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Determine the time that will be required to drill a blind hole of diameter 25 mm and depth 40 mm in a mild steel solid block by a HSS drill of 118 degree cone angle. Assuming the cutting velocity as 25 m/min, Feed as 0.16 mm/rev.
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Enumerate different methods of Indexing and explain any one in detail.
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Explain in detail the hole basis system and shaft basis system with suitable examples.
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Explain in detail the working of auto collimator with a suitable sketch.
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Explain the construction and working of Bevel protractor.
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Explain the principle of Interchangeability and Selective assembly.
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Explain in detail the working of Talysurf in measuring surface roughness.
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Explain in detail the alignment test performed on lathe machine.
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Classify different types of coordinate measuring machines and explain any one in detail.
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Explain in detail the alignment test performed on drilling machine.
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