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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. Spring having square ends has 1 inactive coil.
2. When two Belleville springs are in parallel, half force is obtained for a given deflection.
3. If number of coils are 8 and wire diameter of spring 3mm, then solid length is given by?
4. The load shared by each spring is inversely proportional to the cross section of wire.
5. Can concentric springs be used to obtain a force which is not proportional to its deflection?
6. The helix angle is very small about 2⁰. The spring is open coiled spring.
7. The angle of twist for the equivalent bar to a spring is given by? (Symbols have their usual meaning)
8. 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?
9. When two Belleville sprigs are arranged in series, half deflection is obtained for same force.
10. If a spring has plain ends then number of inactive coils is?
11. Multi leaf springs are not recommended for automobile and rail road suspensions.
12. Pitch of coil is defined as axial distance in compressed state of the coil.
13. The spring index is the ratio of wire diameter to mean coil diameter.
14. Surge is a desirable effect in the sprigs.
15. For two spring connected in series, the force acting on each spring is same and equal to half of the external force.
16. In concentric springs, vibrations called surge are amplified.
17. A railway wagon moving with a speed of 1.5m/s is brought to rest by bumper consisting of two springs. Mass of wagon is 100kg. The springs are compressed by 125mm. Calculate the maximum force acting on each spring.
18. 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.
19. If uncompressed length of spring is 40mm and number of coils 10mm, then pitch of coil is?
20. For two springs connected in parallel, net force is equal to the sum of force in each spring.
21. The strain energy stored in a spiral spring is given by?
22. For a helical torsion sprig, the stress concentration factor at outer fibre is? Give spring index=5.
23. A spring of stiffness constant k is cut in two equal parts. The stiffness constant of new spring will be k/2.
24. If the spring is compressed completely and the adjacent coils touch each other,the the length of spring is called as?
25. If spring index=2.5, what can be concluded about stresses in the wire?

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