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2003 Course Design Engineering

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Total No. of Questions : 12] P1041 [Total No. of Pages : 5 [3864]-151 B.E. (Mechanical S/W) DESIGN ENGINEERING (2003 Course) Time : 4 Hours] [Max. Marks : 100 Instructions to the candidates: 1) 2) 3) 4) 5) Answer three questions from section-I and three questions from section-II. Answers to the two sections should be written in separate books. Neat diagrams must be drawn wherever necessary. Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. Assume suitable data, if necessary. SECTION - I Q1) A straight bevel pinion having 21 teeth to be made of alloy steel (Sult = 800 MPa) is to mesh with bevel gear made of plain carbon steel (Sult = 720 MPa). The axes of pinion and gear intersect at right angles. The gear pair is required to transmit 13kW power from a spindle running at 500rpm to a machine running at 300rpm. The starting torque of the motor is 110% of the rated torque. The factor of safety is 2.0. Tooth system is 20o full depth involute. The gears are to be machined to meet the specifications of grade 6. The pinion and gear are to be case hardened to 400 BHN and 350 BHN respectively. The deformation factor for gear pair is 10900 e N/mm. Design the gear pair using Buckingham s equation for dynamic load. For grade 6. e = 8 + 0.63 [ m + 0.25 dm ] where dm : is mean diameter in mm. Velocity factor = 6 6+v Std module (mm) 1, 2, 3, 4, 6, 8, 10, 12, 15 OR [18] Q2) A single start worm to be made of case hardened steel is to mesh with worm gear having permissible bending stress of 85 MPa. The wear factor is 0.55 MPa. The ratio of pitch circle diameter of worm to the module is 10. Tooth system is 20o full depth involute. The gear pair is required to transmit 10kW of power from an electric motor running at 1500 rpm to the hoisting drum running at 30 rpm. The application factor and factor of safety are 1.25 and P.T.O.

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