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Mechanical System Design (October 2009)

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Total No. of Questions : 12] P967 [Total No. of Pages :7 [3664] - 122 B.E. (Mechanical) MECHANICAL SYSTEM DESIGN (2003 Course) (402041) Time : 4 Hours] [Max. Marks:100 Instructions to the candidates: 1) Answer three questions from Section I and three questions from Section II. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables, electronic pocket calculator is allowed. 6) Assume suitable data, if necessary. 7) State Assumtions made. SECTION - I Unit - I Q1) a) Derive Lame s equation for thick cylinders. Highlight the assumptions made. [8] b) A closed vessel having internal diameter of 430mm is to be designed to withstand an internal pressure of 45 MPa. Material to be used is ductile material with Syt 300MPa, Sut 500MPa and Poisson s ratio 0.3. Estimate the wall thickness by using Factor of Safety 1.5 So designed cylinder if overloaded above the designed pressure, what will be the magnitude of pressure at which the cylinder will actually fail? [8] OR Q2) a) b) What is meant by pre-stressing of a cylinder? What is its necessity? Explain any one method of pre-stressing cylinder. [6] A reaction vessel of cylindrical shell of l200mm is provided with a nozzle having an opening of 125mm diameter. Protruding length of nozzle inside and outside the shell is same and it is made up of seamless tube. The thickness of shell is 8mm and that of nozzle is l2mm. Internal pressure in the shell is 0.8MPa. The corrosion allowance is 1.5mm. Permissible tensile stress for shell and nozzle material is 80MPa. Design the dimensions of reinforcing pad if required (Round off the obtained dimension to nearest Tens digit. The reinforcing material is of same quality as that of the shell and is available in thickness of 4mm. (Assume weld efficiency as 85%). [10] P.T.O.

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Additional Info : 2003 Course
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