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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. 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.
2. Needles bearings have not much load capacity as they are quite small.
3. 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 reaction at pivot in horizontal direction. Assume coefficient of friction as 0.2.
4. For non-parallel shafts, chain drives are highly recommended.
5. A cone clutch with a small semi cone angle requires a relatively large force to engage and small force to disengage.
6. The maximum achievable efficiency of the chain drives is about 80%.
7. If initially drum of radius 200mm is rotating at 100rpm, then calculate the heat generated if frictional force acting is 1140N.
8. 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.Calculate energy absorbed by the brake if square of radius of gyration is 0.2.
9. A self-locking differential brake and back stop brakes is same thing.
10. Ribbed V belts are very stable and can tolerate some misalignment without any malfunctioning.
11. Gear drives are preferred over chain drives for long centre distances.
12. Crowns are never mounted on the pulley.
13. V belts have v shaped cross section.
14. A ribbed V belt is a negative drive.
15. In positive contact clutches, power transmission is achieved by means of friction.
16. 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.
17. The layer of a belt is generally called as
18. 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.
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 operating force in the clutch.
20. Loss of torque transmitting capacity at high temperatures is called
21. A pivoted double block brake has a drum radius of 280mm with two shoes subtending an angle of 100⁰. Calculate the distance of pivot from axis of drum.
22. 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 power transmitting capacity of the clutch at 80rad/s.
23. 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 torque capacity of the brake.
24. Disk brakes can be used for opposite rotation of disk also.
25. Band brake has complex construction with large number of parts.

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