Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech IV Year CAD/CAM Previous Question Paper (May/June - 2019 - R15)
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
List the objectives of a CAD data base.
Answer
The primary objectives of a CAD database are to ensure data integrity, maintain consistency across design iterations, provide efficient data retrieval and storage, and support multi-user access for collaborative engineering.
Differentiate between interpolation and approximation.
Answer
Interpolation involves creating a curve that passes exactly through all specified data points, ensuring the curve honors every coordinate provided. Approximation involves creating a curve that passes near the data points to represent the general trend or shape, often minimizing the distance between the curve and the points without necessarily passing through them.
List the various the Boolean operations used in solid modeling.
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Suggest the procedure that is required to create the surfaces of the vanes and inner projections of the shroud of a mixed flow impeller.
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Enumerate any four motion statements used in APT part programming.
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What are the memory devices used in NC, CNC and DNC machines?
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What are the two types of parts similarities?
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What is the importance of Retrieval CAPP system?
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What are the major elements of flexible manufacturing system (FMS)?
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What are the important machine tools in a CIM system?
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Part B
What are the basic reasons for implementing CAD/CAM applications in design and manufacturing process? List the major specifications of a design workstation. Describe the sources of ambiguities in the wire frame modeling of an object.
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Enumerate the properties of the Bezier basis functions. Find the equation of a Bezier curve which is defined by four control points as (80,30,0), (100,100,0), (200,100,0) and (250,30,0).
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A cylindrical surface is generated by sweeping a quarter circle in the xy plane along the z-axis by 4 units. The quarter circle has a unit radius and is centered at (0, 0, 0). Derive the parametric equation of the surface. If the surface is to be represented by the B-Spline surface, determine the knot values and the coordinates of the control points.
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Distinguish between solid modeling using CSG technique and B-rep technique. Describe the Euler – Poincare formula with suitable examples. Construct the CSG tree and CSG expressions for a solid model.
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Compare the Open-Loop NC control system with closed-Loop NC control system. Write a part program manually to mill the edge of the plate. Assume thickness as 15 mm.
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Explain the usage of IJK part programming method for arc generation. Write a manual part program to finish turn a hemispherical end on a stainless steel shaft of 30 mm diameter. Assume spindle speed as 650 rpm and feed rate as 0.5 mm/rev.
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Discuss the different stages of a group technology plan. Discuss the types of work that are to be conducted at each stage of the plan. Explain in detail about the production flow analysis.
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Describe in detail about the methods used in Computer-Aided Process Planning. Differentiate between the Enterprise resource planning and Capacity requirements planning.
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Sketch the layout of a typical FMS and explain the important subsystems. Compare FMS with transfer lines and CNC on the basis of volume and variety of parts produced.
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Compare different CIM Models with particular reference to the flow of information. Differentiate between on-line/in-process and on-line/post-process inspection methods.
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