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Machine Design Practice Test: Friction Clutches, Brakes, Belt Drives and Chain Drives
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Friction Clutches, Brakes, Belt Drives and Chain Drives topics include: Friction clutches, cone clutches, centrifugal clutches, brakes, block brakes, expanding brakes, belt drives and constructions, chain drives and its design. Friction clutches, brakes, belt drives, and chain drives are mechanical components that transmit power and motion.  Friction clutches: These clutches use friction between surfaces to transmit torque and power between two rotating shafts. The surfaces are lined with materials like cork or asbestos. Friction clutches are used in many applications, including... Show more
Machine Design Practice Test: Friction Clutches, Brakes, Belt Drives and Chain Drives
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25 Questions

1. The wear of band brake is even.
2. The force of friction between belt and V grooved pulley is high.
3. A self-locking differential brake and back stop brakes is same thing.
4. Loss of torque transmitting capacity at high temperatures is called
5. The equivalent coefficient of friction in case of block brake with long shoe is denoted by μ[4Sinθ/2θ+sin4θ].
6. Power is transmitted only by key and friction in the cone clutch.
7. 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.
8. Heat dissipating capacity of internally expanding brakes is a problem.
9. Calculate the belt length if diameter of the two pulleys are 550mm and 300mm. Also the centre distance is 2800mm.
10. If velocity ratio is less than 3, then centre distance is given by D+.5d.
11. When semi vertical angle is greater than angle of static friction, clutch results in self-engagement.
12. Shoe is constrained to move towards the drum to compensate for the moment acting.
13. Disc brakes are radial brakes.
14. Is it possible to prevent back rotation of drum?
15. In a centrifugal clutch, when the centrifugal force is slightly more than the spring force, shoe begins to move in a radially inward direction.
16. The efficiency of flat belt drive is 35%. If all the parameters are same and flat belt is replaced by V belt, than the efficiency of V belt will be?
17. In flexible drives, rotary motion of driving shaft is directly converted to rotary motion of driven shafts
18. If belt tension in the two sides is 730N and 140N and belt is moving with a velocity of 10m/s, calculate the power transmitted.
19. Calculate the braking torque if tension in the two sides is 3500N and 1980N with radius of drum being 160mm.
20. Gear drives are preferred over chain drives for long centre distances.
21. The optimum velocity of the belt for maximum transmission is given by √P/6m.
22. The ribbed V belts don’t require any type of lubrication like V belts.
23. In positive contact clutches, power transmission is achieved by means of friction.
24. For a new friction lining, uniform wear theory is used.
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 torque transmitting capacity of the clutch.