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2003 Course Design Eng.

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Total No. of Questions : 12] P1318 [Total No. of Pages : 5 [3764]-151 B.E. (Mechanical S/W) DESIGN ENGINEERING (2003 Course) Time : 4 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer three questions from Section I and three questions from Section II. 2) 3) Answers to the two sections should be written in separate answer books. Neat diagrams must be drawn wherever necessary. 4) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 5) Annume suitable data, if necessary. SECTION - I Q1) a) A straight bevel pinion having 18 teeth is to mesh with a straight bevel gear having 40 teeth. Pinion and gear are made of case hardened steel having ultimate tensile strengths of 720 MPa and 580 MPa respectively. The gear pair is manufactured by generation. The pinion is connected to 15 kW, 1440 rpm electric motor. The starting torque is approximately twice the rated torque. If the surface hardness of the gear pair is to be 350 BHN, design the gear pair with a factor of safety of 1.5. Assume velocity factor accounts for dynamic load. [12] b) Sketch and describe various arrangements of worm gear reducer. [6] OR Q2) a) A worm gear pair transmits 5 kW power from a shaft rotating at 1440 rpm to another shaft rotating at 36 rpm. The worm gear is made of phosphor bronze and worm is made of 14C6. The normal pressure angle is 20o. The temperature rise of the lubricating oil is limited to 50oC and the overall heat transfer coefficient is 18 W/m2 oC. i) Find dimensions of worm and worm gear. ii) Required effective surface area of the gear box approximate centre distance is a 8[(G + 5) Pi]0.588 mm. Where G gear ratio, Pi - input power kW. P.T.O. 1

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