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2003 Course Design Eng.

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Total No. of Questions : 12] P1150 [Total No. of Pages : 5 [3664]-141 B.E. (Mech. 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) Answers to the two sections should be written in separate books. 3) 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) Assume suitable data, if necessary. SECTION - I Q1) a) A pair of straight bevel gears mounted on shafts, which are intersecting at right angle consists of 24 teeth pinion meshing with 32 teeth gear. The pinion is connected to 7.5 kW, 1000 rpm electric motor. The starting torque of the motor is 125% of the rated torque. The load distribution factor is 1.2. The gear is made of gray cast iron FG 350, while the pinion is made of case hardened 40 C8 (Sult = 580 N/mm2). The gears are generated. Tooth system is 20 full depth involute. i) ii) If the factor of safety required against bending failure is 3.0, design the gear pair by using velocity factor. If the factor of safety required against pitting failure is 2.0, specify the surface hardness required on the gears. Velocity factor = 5.6 5.6 + v Lewis form factor = 0.484 2.87 Z Std module (mm) : 1, 2, 3, 4, 6, 8, 10, 12, 15 [12] P.T.O.

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