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Machine Design Practice Test: Wire Ropes Stresses, Buckling of Columns
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Wire ropes are stressed by: Direct stress: The weight of the rope and the axial load lifted Bending stress: When the rope winds around the sheave or drum Stresses during starting and stopping Stress due to change in speed Effective stress  Wire ropes are also stressed by fluctuating forces, wear, corrosion, and in rare cases, extreme forces.  Some typical failure modes of wire ropes include: Fracture, Wear, Corrosion, Geometric failure, Thermal failure.  The stress at the middle cross section of wire rope is symmetrically distributed. The average stress level of IWS is higher than... Show more
Machine Design Practice Test: Wire Ropes Stresses, Buckling of Columns
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20 Questions

1. The wire rope is subjected to
2. In design of wire ropes, bending stress is converted into an equivalent bending load which is given by [d= diameter of individual wire and D= diameter of sheave].
3. An elevator is assembled to raise equipment to a height of 22m. It is estimated that maximum weight of the material to be raised is 4.9kN. It is observed acceleration in such cases is 1.2m/s².10mm diameter wire ropes with fibre core are used. The tensile designation of the wire is 1500.Number of rope wires is assumed to be 2. Number of rope wires is assumed to be 2. Calculate the total load on wire rope neglecting the bending load if weight of 50m wire is 18kg.
4. Columns with what slenderness ratio are not designed with respect to buckling but are designed for compressive stresses.
5. Piston rod is an example of column.
6. Which type of rope drum is preferred?
7. An elevator is assembled to raise equipment to a height of 22m. It is estimated that maximum weight of the material to be raised is 4.9kN. It is observed acceleration in such cases is 1.2m/s².10mm diameter wire ropes with fibre core are used. The tensile designation of the wire is 1500. Number of wire ropes can be taken 2. Calculate the weight of material raised by each load.
8. Cast iron column with a slenderness ratio of 75 are
9. If nominal diameter of the rope is 20mm, then pitch of the groove is around?
10. Small sheaves are preferred over large sheaves on what parameters?
11. Which of the following are true for End fixity coefficient
12. Steel columns with a slenderness ratio of 95 are
13. Short column and long column are classified on the basis of
14. Value of end fixity coefficient for both hands fixed is
15. If slenderness ratio=45, which mode of failure will dominate?
16. An elevator is assembled to raise equipment to a height of 22m. It is estimated that maximum weight of the material to be raised is 4.9kN. It is observed acceleration in such cases is 1.2m/s².10mm diameter wire ropes with fibre core are used. The tensile designation of the wire is 1500.Number of rope wires is assumed to be 2. Number of rope wires is assumed to be 2. Calculate the weight of wire if weight of 50m wire is 18kg. Calculate the force due to acceleration.
17. Bucking of column means
18. Slenderness ratio is [l= length of column and k= least radius of gyration of cross section about its axis].
19. Rope operating over steel sheaves wear slowly than those used in conjunction with cast iron sheaves.
20. An elevator is assembled to raise equipment to a height of 22m. It is estimated that maximum weight of the material to be raised is 4.9kN. It is observed acceleration in such cases is 1.2m/s².10mm diameter wire ropes with fibre core are used. The tensile designation of the wire is 1500.Number of rope wires is assumed to be 2. Calculate the weight of wire if weight of 50m wire is 18kg.

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