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Machine Design 2: Design of Clutches, Design of Brakes
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Machine Design 2: Design of Clutches, Design of Brakes
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1. A solid cast iron disk of mass 1000kg is rotating at 350rpm. Diameter of the disk is 1m and time taken to come to stop the disk by brake is 1.6sec.Square of radius of gyration is 0.2. Calculate the average angular velocity during braking period.
2. The centrifugal force acting on the shoe can never be omitted.
3. A cone clutch transmits 24kW at 490rpm. The coefficient of friction is 0.2 and allowable intensity of pressure is 0.35N/mm². The semi cone angle is 12⁰. The outer diameter is fixed as 310mm.Assuming uniform wear theory; calculate force required to engage clutch.
4. Chain saws, lawnmowers, golf carts etc. never use centrifugal clutches.
5. A plate clutch consists of 1 pair of contacting surfaces. The inner and outer diameter of the friction disk is 100mm and 200mm respectively. The coefficient of friction is 0.2 and permissible intensity of pressure is 1.5N/mm². Assuming uniform wear theory, calculate the torque transmitting capacity of the clutch.
6. For a new friction lining, uniform wear theory is used.
7. In internally expanding brake, a large actuating force produces a small braking torque and hence this brake isn’t used generally.
8. A cone clutch transmits 24kW at 490rpm. The coefficient of friction is 0.2 and allowable intensity of pressure is 0.35N/mm². The semi cone angle is 12⁰. The outer diameter is fixed as 310mm.Assuming uniform wear theory; find the inner diameter.
9. The intensity of normal pressure between the friction lining and the brake drum at any point is proportional to square of the vertical distance from the pivot.
10. The coefficient of friction in internally expanding brakes is constant.
11. A cone clutch transmits 24kW at 490rpm. The coefficient of friction is 0.2 and allowable intensity of pressure is 0.35N/mm². The semi cone angle is 12⁰. The outer diameter is fixed as 310mm.Assuming uniform wear theory; find the face width of friction lining.
12. In scooters, generally single plate clutches are used.
13. In a centrifugal clutch, when the centrifugal force is slightly more than the spring force, shoe begins to move in a radially inward direction.
14. Internal shoe brakes are radial while external shoe brakes are axial brakes.
15. A cone clutch with a small semi cone angle requires a relatively large force to engage and small force to disengage.
16. Disc brakes are radial brakes.
17. The centrifugal clutches are used in light duty vehicles and not in heavy duty vehicles.
18. Eddy current clutch is a type of friction clutch.
19. A plate clutch consists of 1 pair of contacting surfaces. The inner and outer diameter of the friction disk is 100mm and 200mm respectively. The coefficient of friction is 0.2 and permissible intensity of pressure is 1.5N/mm². Assuming uniform pressure theory, calculate the torque transmitting capacity of the clutch.
20. Preloading is recommended for bearings.
21. If number of contacting surfaces are 5, then number of disks required in multi disk clutch are?
22. When semi vertical angle is greater than angle of static friction, clutch results in self-engagement.
23. In positive contact clutches, power transmission is achieved by means of friction.
24. Find number of contacting surfaces for a multi disk clutch plate transmitting torque of 10N-m and inner and outer diameters of friction lining are 70mm and 100mm respectively. The operating force is of magnitude 305N and coefficient of friction is 0.2.
25. A plate clutch consists of 1 pair of contacting surfaces. The inner and outer diameter of the friction disk is 100mm and 200mm respectively. The coefficient of friction is 0.2 and permissible intensity of pressure is 1.5N/mm². Assuming uniform wear theory, calculate the operating force in the clutch.

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