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Machine Design Practice Test: Springs
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Avg score: 3% Most missed: “Propagation of fatigue failure is always due to compressive stresses.”
Springs topics include: Spring design, helical springs, spiral springs, concentric springs and multi leaf springs. Springs are mechanical devices that store energy and can be found in many types of machines. They can be classified by how the load is applied to them or by how they are made.  Here are some types of springs: Helical springs: These springs have a helix shape and different cross-sections. They are the most common type of spring in rapid prototyping. Leaf springs: These springs are made from rectangular metal plates or leaves that are bolted and clamped. They are used in shock... Show more
Machine Design Practice Test: Springs
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25 Questions

1. Belleville spring can only produce linear load deflection characteristics.
2. Calculate the bending stress induced in the strip of the helical spring. The spring is subjected to a moment of 1250N-mm with breadth and thickens of the strip being 11mm and 1.5mmm respectively.
3. Bending stress in graduated length leaves are more than that in full length leaves.
4. Belleville spring can be used in clutch application.
5. The longest leaf in a leaf spring is called centre leaf.
6. For a helical torsion sprig, the stress concentration factor at inner fibre is? Give spring index=5.
7. What will happen if stresses induced due to surge in the spring exceeds the endurance limit stress of the spring.
8. The strain energy stored in a spiral spring is given by?
9. A leaf spring consists of 3 extra full length leaves and 14 graduated length leaves. The maximum force that can act on the spring is 70kN and the distance between eyes of the spring is 1.2m. Width and thickness of the leaves are 100mm and 12mm respectively. If modulus of elasticity is 207000N/mm², calculate the initial nip.
10. The strip of spiral spring is never subjected to pure bending moment.
11. Spiral spring is quite rigid.
12. When two Belleville springs are in parallel, half force is obtained for a given deflection.
13. Surge is caused by resonance effect in the spring.
14. Find the mean coil diameter of a helical compression sprig if a load of 1200N is applied on the spring. Spring index is 6, and wire diameter 7mm.
15. The angle of twist for the equivalent bar to a spring is given by? (Symbols have their usual meaning)
16. The spring index is the ratio of wire diameter to mean coil diameter.
17. Propagation of fatigue failure is always due to compressive stresses.
18. If the spring is compressed completely and the adjacent coils touch each other,the the length of spring is called as?
19. The helical spring ad wire of helical torsion spring, both are subjected to torsional shear stresses.
20. Two spring having stiffness constants of 22N/mm and 25N/mm are connected in parallel. They are to be replaced by a single spring to have same effect. The stiffness of that spring will be?
21. The load shared by each spring is inversely proportional to the cross section of wire.
22. Pitch of coil is defined as axial distance in compressed state of the coil.
23. The axial deflection of spring for the small angle of θ is given by?
24. Multi leaf springs are not recommended for automobile and rail road suspensions.
25. A concentric spring consists of 2 sprigs of diameter 10mm and 4mm. The net force acting on the composite spring is 5000N. Find the force acting on each of the two springs.