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2003 Course Product Design & Computer Applications

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Total No. of Questions : 7] [Total No. of Pages : 4 P1191 [3664]-301 B.E. (Polymer) PRODUCT DESIGN AND COMPUTER APPLICATIONS (2003 Course) Time : 4 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. SECTION - I Q1) a) Explain isochronous and isometric graphs. How are they used in plastic product design? [4] b) Viscoelastic behaviour of a plastic is represented by a spring and dash pot elements with constants of 4GN/m2 and 100 GNs/m2 respectively. If a stress of 14 MPa is applied for 100 seconds and then completely removed, compare values of strain predicted by Maxwell model and Kelvin-Voight model after [6] i) ii) c) 55 seconds. 130 seconds. Illustrate Maxwell model for relaxation and creep. [6] OR Q2) a) b) Write short notes on any 2 : [6] i) Different types of mesh used in FEA. ii) Concurrent engineering approach in product design. iii) Steps followed in product design. Explain stress relaxation behaviour and creep behaviour in plastics using Kelvin-Voight model. [6] P.T.O.

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