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CAD/CAM & Automation (October 2009)

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Total No. of Questions : 12] P1118 [Total No. of Pages : 4 [3664]-132 B.E. (Mechanical and Mechanical S/W) CAD/CAM AND AUTOMATION Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answers to the two sections should be written in separate books. 2) Neat diagrams must be drawn wherever necessary. 3) Figures to the right indicate full marks. 4) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 5) Assume suitable data, if necessary. 6) All questions are compulsory. SECTION - I Q1) a) Find the co-ordinates of triangle ABC with vertices A(3, 3), B(9, 3) and C(3, 7) when it is scaled by Sx = 2 and Sy = 2 about point P(5, 4). [6] b) What do you understand by Mapping of Geometric Model ? [5] c) Write a short note on Inverse Transformation. [5] OR Q2) a) A triangle PQR represented as P(14, 15), Q(66, 15) and R(40, 60). It is mirrored about line y = 30. Determine the new coordinates of the triangle. [6] b) Write a short note on transformation matrix for perspective projections. [5] c) Determine the concatenated transformation matrix for reflecting any entity about any given line. [5] Q3) a) Formulate the equation and end point of a line which passes through a point P1 and is trimmed by a point Pt as shown in the fig. The line is to be parallel to an existing line passing through points P3 and P4. [8] P.T.O. b) Write a short note on B-Spline Curve. [4] c) What are the advantages of parametric representation of curve in CAD system. [4] OR Q4) a) Plot the Bezier curve having end points P0(1, 3) and P3(7, 2). The other control points are P1(5, 6) and P2(6, 0). Plot for values of u = 0, .2, .4, .6, .8 and 1, if the charecteristic polygon is drawn in the sequence P0 P1 P2 P3. [8] b) Explain different solid manipulations and its importance. [8] Q5) a) A system of spring is shown in the fig. Determine the overall stiffness matrix and deflection of each spring. [8] b) Derive an expression for the element stiffness matrix of the two noded truss elements. [6] c) Explain, with suitable examples, the plane stress and plane strain condition. [4] OR Q6) a) A four bar truss is as shown in the fig. Assuming that for each element the cross sectional area is 400mm2 and E = 200 GPa, determine the deflection, reaction forces and stresses in each element. [10] [3664]-132 2 b) What is the significance of shape functions? Explain shape function in terms of natural coordinates, for the three noded 1-D elements. [4] c) Obtain the stress-nodal displacement relationship for the one-dimensional element. [4] SECTION - II Q7) a) A CST element is defined by nodes at I(24, 30), J(60, 20), and K(90, 50) and the stress at these nodes are 90, 120 and 160 MPa respectively. Determine the stress at point P(60, 30). [6] b) Derive a relation to determine the Jacobian function for CST element.[6] c) Explain higher order 2D element. [4] OR Q8) a) Explain how symmetry is used in FEA with applications. [8] b) Explain shape function of CST element. Also explain the physical representation by area coordinates. [8] Q9) a) What do you understand by machine zero and job zero? Explain the significance of using job zero method. [6] b) Write a manual part program for finishing a forged component as shown in the figure. Assume the speed and feed on the turning centre as 400 rpm and 0.35mm/rev. assume 1 mm material is to be removed radially [10] from external diameter. OR Q10) a) Write a note on new trends developing in CNC / DNC technology. [6] b) Write an APT part program to machine the outline of the geometry shown in fig. Assume the component to be 5 mm thick. The post processor cell statement is MACHINE/ABM, 1. The end mill is used is 10 mm in diameter. Assume spindle speed as 1000 rpm and feed as 0.3 mm/rev. [10] [3664]-132 3 Q11) a) What are the elements of FMS? [6] b) Write a short note on Vacuum Grippers used for robot. [6] c) What are the different strategies adopted in automation? [6] OR Q12) a) What is machining centre? What are its advantages? [6] b) What are different types of joints used in Robot? [6] c) Write a short note on Robot sensors. [6] xxxx [3664]-132 4

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