JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B. Tech III METROLOGY AND MACHINE TOOLS Previous Question Paper (August/September - 2024 - 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
How do you specify the lathe machine?
Answer
A lathe is specified by the height of the centers over the bed, the maximum length of the workpiece that can be accommodated between centers, the swing over the bed, the swing over the carriage, the bed length, and the spindle speed range.
Differentiate orthogonal and oblique cutting.
Answer
In orthogonal cutting, the cutting edge is perpendicular to the direction of tool travel, resulting in a two-dimensional force system. In oblique cutting, the cutting edge is inclined at an angle to the direction of tool travel, creating a three-dimensional force system where the chip flows at an angle.
How do you specify a drilling machine?
Answer
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Give the classification of boring machines.
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What materials can be honed? What is the disadvantage of honing?
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Calculate the machining time required for broaching a square hole in a hub. The effective length of the broach is 500mm and the cutting speed is 2.5m/min.
Answer
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What are the limitations of interchangeable assembly?
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Explain the principle of working of autocollimator.
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Give the classification of CMMs.
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Justify the need for alignment tests on machine tools.
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Part B
Explain the importance of tool angles of single point cutting tool, with neat sketches.
Answer
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List and describe commonly used attachments on lathe with suitable sketches.
Answer
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Explain about Discontinuous chip, Continuous chip, and continuous chip with built up edge.
Answer
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Differentiate between single spindle and multi-spindle automatic lathes.
Answer
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A mild steel plate measuring 400mm × 800mm × 30mm is to be shaped along its wider face. The ratio of return time to cutting time is 2:3 and the feed per cycle is 2mm. tool approach and the over travel respectively are 50mm each. Select a suitable cutting speed and calculate the machining time required for machining the given plate with H.S.S. tools.
Answer
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Explain the operations done on drilling machine in detail, with neat sketches.
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Sketch and describe the construction and working of a double housing planer.
Answer
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What is a twist drill? Explain the parts and function of a twist drill. What are the advantages of using it?
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Make a neat sketch of universal milling machine indicating the various controls and constructional features. Give brief description.
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Examine the advantages and disadvantages of vitrified bond.
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Explain the tool geometry of milling cutters with neat sketches.
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Describe a grinding wheel structure with the help of neat sketch and state different bonding and abrasive materials used in it.
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What is fit? Give the complete classification and explain them.
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Explain the constructional details of bevel protractor.
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List out the advantages of selective assembly.
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Sketch and explain Taylor-Hobson talysurf surface roughness measuring instrument.
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Explain the alignment tests to be conducted on drilling machine.
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Explain the basic principle of working of coordinate measuring machine.
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Suggest and explain a technique to measure major diameter of internal threads.
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