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Rigging 2
Rope
| Question | Answer |
|---|---|
| 1. ___ is a length of fibers or thin wires that are twisted or braided together to form a strong and flexible line | rope |
| 2. How is fiber rope constructed | twisting fibers into yarn, then yarn into strand, then twisting strands into rope |
| 3. Define the term yarn when it is used for the construction of rope | a continuous line of fibers twisted together |
| 4. Define the term strand when it is used for the construction of rope. | several pieces of yarn or wire twisted spirally around an axis |
| 5. The ___ is a designation for the direction in which the strands are twisted specified as they spiral away from the observer. | lay |
| 6. A ___ is a rope in which the yarn or wires in the strands are twisted in the opposite direction to the lay of the strands. | regular-lay rope |
| 7. Which type of rope lay is identified bt its yarn or wires crossing the axis of the rope at approximately 45 degrees. | Lang-lay ropes |
| 8. Which type of rope lay provides for a greater useful life, and what in the design of this type of lay increases its useful life | Lang-lay, expose more of yarn to wear at outer surface & greater flexibility & untwist under tension |
| 9. List an advantage and a disadvantage of lang-lay ropes | Advantage - flexible, Disadvantage - untwists under load |
| 10. ___ is a rope's tendency to rotate and untwist when under load. | cabling |
| 11. Why do rotation-resistant ropes require special handling | because they kink, crush, and become unbalanced |
| 12. A high-strength rope has less twist, which is referred to as "___". Rope with a high resistance to abrasion has more twist, which is referred to as "____" | soft lay, hard lay |
| 13. How is rope diameter measured | using calipers. from high spot on one side to high spot on opposite side |
| 14. Rope wear that reduces strength is indicated by ___ | abrasion marks, reduction in diameter |
| 15. The strength rating of rope is based on its __ | breaking strength |
| 16. How are safe working load limits for rope established | testing many samples until they break |
| 17. A ___ is the ratio of a component's ultimate strength to its maximum allowable safe working load limit. | safety factor |
| 18. Generally, safety factors in rigging and lifting are normally between five and eight True or False | True |
| 19. A safety factor of ___ is used for steady or even loads. A safety factor of ___ is used for uneven loads or lifts that may shock the slings. | 5, 8 |
| 20. What is the formula for calculating a rope's braking strength rating needed to safely lift load | Sb = WLL * SF; Rope breaking point = Working Load Limit * Safety Factor |
| 21. What is the rope breaking strength required to lift a piece of 2,000 lib switchgear with a single vertical sling. use safety factor of 5 | |
| 22. Using the refer tables, what is the minimum diameter improved plow steel fiber core wire rope that can be used for the lift in # 21 | |
| 23. Bending a rope over a small diameter can reduce its effective strength by more than ___ | |
| 24. Bending efficiency can be increased when __ are used in rope ends or rope loops | |
| 25. Natural fiber ropes can be used in corrosive chemical environments because natural fibers better withstand a wider variety of chemical conditions than wire ropes that are more subject to corrosion in these environments. | |
| 26. ___ is the wire wrapping that binds the end of a wire rope near where it is cut | |
| 27. ___ is the twine wrapping that binds the end of a fiber rope near where it is cut | |
| 28. The selection of an appropriate wire ripe for lifting is based on what factors | |
| 29.Identify the wire strand patterns in the figure p 10 | |
| 30. HOw is a wire ripe classified | |
| 31. When lifting a load, __- should be placed over any art of the load that will contact the rope during lifting | |
| 32. A __- is a socket that is compressed onto the end of a wire rope | |
| 33. A __ is a socket that holds a loop of wire rope securely with a wedge that is tightened by tension on the rope | |
| 34. A __ is a socket that uses molten zinc or resin to secure the end of a wire rope inside the socket | |
| 35. What classifications of manila rope can be used for lifting applications | Yacht, # 1 |
| 36. Lay length measurements are used to determine if the rope has ___ | stretched |
| 37. __ rope consists of an even number of strands woven into a tube shape. This braid may be used to cover a core material or th interior may be left void. ___ rope consists of completely separate inner an outer braids, which may be of different materials | |
| 38. What is "plaiting" | |
| 39. A splice can retain up to __ of the original strength of a rope. When joining ripe, splices are preferred over knots, which can reduce ripe strength by as much as __ | |
| 40. __ is a splice that finishes a rope end by braiding its loose strands back on itself. | crowning |
Created by:
JoshHampton