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Machine Design 1: Design of Springs
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Machine Design 1: Design of Springs
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25 Questions

1. Pitch of coil is defined as axial distance in compressed state of the coil.
2. Bending stress in graduated length leaves are more than that in full length leaves.
3. 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.
4. If the spring is compressed completely and the adjacent coils touch each other,the the length of spring is called as?
5. The helix angle is very small about 2⁰. The spring is open coiled spring.
6. Surge is caused by resonance effect in the spring.
7. For two springs connected in parallel, net force is equal to the sum of force in each spring.
8. What will happen if stresses induced due to surge in the spring exceeds the endurance limit stress of the spring.
9. Active and inactive, both types of coils support the load although both don’t participate in spring action.
10. Nipping is defined as leaving the gap between full length leaf and graduated length leaf.
11. For a helical torsion sprig, the stress concentration factor at outer fibre is? Give spring index=5.
12. Martin’s factor compensates for curvature effect in springs.
13. When two Belleville sprigs are arranged in series, half deflection is obtained for same force.
14. For two springs connected in series, the net deflection is equal to the sum of deflection in two springs.
15. If a spring has plain ends then number of inactive coils is?
16. If spring index=2.5, what can be concluded about stresses in the wire?
17. Find total number coils in a spring having square and ground ends. Deflection in the spring is 6mm when load of 1100N is applied. Modulus of rigidity is 81370N/mm². Wire diameter and pitch circle diameter are 10mm and 50mm respectively.
18. Find the shear stress in the spring wire used to design a helical compression sprig if a load of 1200N is applied on the spring. Spring index is 6, and wire diameter 7mm.
19. If the spring have same solid length and number of coils in the two springs are 8 and 10, then find the diameter of the spring with 8 coils. It is given diameter of spring with 10 coils is 12mm.
20. Spring having square ends has 1 inactive coil.
21. The spring index is the ratio of wire diameter to mean coil diameter.
22. For two spring connected in series, the force acting on each spring is same and equal to half of the external force.
23. The load shared by each spring is inversely proportional to the cross section of wire.
24. The axial deflection of spring for the small angle of θ is given by?
25. 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?

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