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Machine Design Practice Test: Friction Clutches, Brakes, Belt Drives and Chain Drives
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Avg score: 33% • Most missed: “A ribbed V belt is a negative drive.”
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 energy absorb by brake is always kinetic.
2. Power is transmitted only by key and friction in the cone clutch.
3. Calculate the belt length if diameter of the two pulleys are 550mm and 300mm. Also the centre distance is 2800mm.
4. A ribbed V belt is a negative drive.
5. Galling is a stick slip phenomenon.
6. A shorter centre distance is always preferred in belt drives.
7. 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 angle through which disk rotated during braking period.
8. Band brakes require _____ maintenance.
9. In the designation ‘04B’, pitch of the chain is?
10. Fabric rubber belts are not widely used as they can’t be operated at high speeds.
11. A pivoted double block brake has a drum radius of 280mm with two shoes subtending an angle of 100⁰. Maximum pressure intensity is 0.5N/mm². If the width of friction lining is 90mm, find the torque capacity f each shoe. Assume coefficient of friction as 0.2.
12. Shoe is constrained to move towards the drum to compensate for the moment acting.
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. If tensions in the belt are P₁ and P₂, then find P₁-mv²/P₂-mv². Contact angle for smaller pulley is 156⁰, Groove angle is 36⁰ and coefficient of friction is 0.2.
15. Calculate the braking torque if tension in the two sides is 3500N and 1980N with radius of drum being 160mm.
16. The number of links of the chain should be always ______
17. The layer of a belt is generally called as
18. Chain drives suffer from wear problems.
19. In positive contact clutches, power transmission is achieved by means of friction.
20. The optimum velocity of the belt for maximum transmission is given by √P/6m.
21. 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.
22. The ribbed V belts don’t require any type of lubrication like V belts.
23. Pneumatic brakes are same as electrical brakes.
24. The pressure intensity at an element on long shoe brake varies directly with the sin of the pressure angle of the element of friction lining.
25. Calculate the pitch circle diameter of the driving pulley is pitch is given as 18mm and sprocket has 19 teeth.

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