ME6601 DESIGN OF TRANSMISSION SYSTEM 2- Marks 1. How are the ends of flat-belt joined? 2. What are the five parts of roller chain? 3. Compare the contact between mating teeth of spur and helical gears. 4. State the reasons for V-belt drive being preferred to flat belt drive? 5. What do you mean by galling of roller chains? 6. Under what situation, bevel gears are used? 7. In worm gear drive, only the wheel designed. Why? 8. How does failure by pitting happen in gears? 9. What is the effect of increasing the pressure angle in gears? 10. Why is dynamic loading rarely considered in worm gear drives? What is step ratio in gear box? 12. What is meant by ray diagram? 13.State the law of gearing. 14. State the advantage and disadvantage with helical gear. 15. State the advantage of herringbone gear. 16. What are preferred numbers? 17. What is meant by a self-energizing brake?

18. What are the effects of temperature rise in clutches? 19. Classify clutches based on the coupling methods. 20. Specify four types of gearboxes. 21. What are the factors upon which the torque capacity of a clutch depends? 22. Name few commonly used friction materials. 23. List the characteristics of materials used for brake linings. 24. Define base circle and pitch circle with respect to cam.

16 - Marks 1. Design a flat belt drive to transmit 6 kw at 900 rpm of the driver pulley. Speed reduction is to be 2.5:1. Assume that the service is 16 hours a day. 2. Design a chain drive to transmit 6 kW at 900 rpm of a sprocket pinion. Speed reduction is 2.5:1 driving motor is mounted on an adjustable base. Assume that load is steady, drive is horizontal and service is 16 hours/day.

3. A 27.5 kW power is transmitted at 450 rpm to a shaft running at approximately 112 rpm through a spur gear drive. The load is steady and continuous. Design the gear drive and check the design. Assume the following materials: Pinion-heat treated cast steel; Gear-High grade cast iron. 4. Design a pair of cast iron bevel gears for a special purpose machine tool to transmit 3.5 kW from a shaft at 500 rpm to another at 800 rpm. The gears overhang in their shafts. Life required is 8000 hours.

5. A gear box is to be designed for the following specifications: Power to be transmitted = 5.5 kW Number of speeds =9

Minimum speed = 280 rpm Maximum speed = 1800 rpm Input motor speed = 1400 rpm Draw the kinematic layout diagram and the speed diagram. Determine the number of teeth for all gears. 6. The spindle of a pillar drill is to run at 12 different speeds in the range of 100 rpm and 355 rpm. Design a three stage gear box with a standard step ratio. The gear box receives 5 kW from an electric motor running at 360 rpm. Sketch the layout of the gear box, indicating the number of teeth on each gear. Also sketch the speed diagram. 7. A plate clutch with maximum diameter 60 mm has maximum lining pressure of 0.35 Mpa. The power to be transmitted at 400 rpm is 135 kW and µ = 0.3. Find inside diameter and spring force required to engage the clutch. Springs with spring index 6 and material spring steel with safe shear stress 600 Mpa. are used. Find the wire diameter if 6 springs are used.

All the Best