Bu basic CH7

Question 1

1. What are the two most commonly used natural fiber ropes? (Page 7-3)

Answer 1

manila and sisal

Question 2

2. Sisal fiber is only about what percent as strong as manila fiber? (Page 7-3)

Answer 2

80%

Question 3

3. How many times stronger is nylon compared to manila? (Page 7-3)

Answer 3

three

Question 4

4. The three types of fiber line lays include hawser-laid, shroud-laid, and what other type? (Page 7-4)

Answer 4

cable laid

Question 5

5. What type of fiber line lay is more pliable and stronger than hawser-laid line but has a strong tendency toward kinking? (Page 7-4)

Answer 5

shroud laid line

Question 6

6. Line that is how many inches or less in circumference is called small stuff? (Page 7-5)

Answer 6

1 3/4 inches

Question 7

7. What size is about the largest manila carried in stock? (Page 7-5)

Answer 7

12 inches

Question 8

8. To avoid overloading, you must know the strength of the line with which you are working which involves what three factors? (Page 7-5)

Answer 8

breaking strength safe working load (SWL) and safety factors

Question 9

9. What property of a line is the ratio between the breaking strength and the safe working load? (Page 7-7)

Answer 9

safety factor

Question 10

10. Wire rope consists of three parts; Wires, strands, and what else? (Page 7-8)

Answer 10

core

Question 11

11. A wire strand core not only resists heat more than a fiber core, but also adds about what percent to the strength of the rope? (Page 7-9)

Answer 11

15

Question 12

12. What method of making wire rope is when strands or wires are shaped to conform to the curvature of the finished rope before laying up? (Page 7-9)

Answer 12

performed

Question 13

13. The main types of wire rope used by the Navy consist of 6, 7, 12, 19, 24, or how many wires in each strand? (Page 7-9)

Answer 13

37

Question 14

14. What is the tensile strength of mild plow steel rope? (Page 7-9)

Answer 14

200,000-220,000 psi

Question 15

15. Each square inch of improved plow steel can withstand a strain of 240,000 to what psi? (Page 7-9)

Answer 15

260,000

Question 16

16. To ensure an accurate measurement of the diameter of a wire rope, always measure at three places, at least how many feet apart? (Page 7-9)

Answer 16

5

Question 17

17. When what percent of the total number of wires in the rope have breaks within the length of one lay of the rope, the wire rope is unsafe? (Page 7-17)

Answer 17

4%

Question 18

18. Rope with a diameter reduced to less than what percent of its original diameter should be removed from service? (Page 7-17)

Answer 18

75%

Question 19

19. What is the attachment used most often to attach dead ends of wire ropes to pad eyes or like fittings on earthmoving rigs? (Page 7-17)

Answer 19

wedge socket

Question 20

20. By what percent does the wedge socket reduce the strength of wire rope? (Page 7-17)

Answer 20

30%

Question 21

21. Clipped eyes with thimbles hold approximately what percent of the wire rope strength? (Page 7-19)

Answer 21

80%

Question 22

22. What is an assembly of blocks and lines used to gain a mechanical advantage in lifting and pulling?

Answer 22

tackle

Question 23

23. What is a lie, either a fiber line or a wire rope, reeved through a pair of blocks to form a tackle? (Page

Answer 23

fall

Question 24

24. The sheave diameter should be about how many tmes the diameter of the wire? (Page 7-22)

Answer 24

20

Question 25

25. What are ordinarily used where it is necessary to change the direction of the pull on a line? (Page 7-23)

Answer 25

snatch blocks

Question 26

26. What property of a tackle is the term applied to the relationship between the load being lifted and the power required to lift it? (Page 7-24)

Answer 26

mechanical advantage

Question 27

27. What is a single sheave movable block that is free to move along the line on which it is reeved? (Page

Answer 27

runner

Question 28

28. What is a technique often used to close the open section of a hook to keep slings, straps, and so on, from slipping off the hook? (Page 7-31)

Answer 28

mousing

Question 29

29. What are the two types of scaffolding in use today? (Page 7-40)

Answer 29

wood and prefabricated

Question 30

30. The poles on a job-built pole scaffold should not exceed how many feet in height? (Page 7-41)

Answer 30

60

Question 31

31. A platform plank must never be less than how many inches thick? (Page 7-42)

Answer 31

two

Question 32

32. Light-duty scaffolding must be able to support how many pounds per square foot loads? (Page 7-42)

Answer 32

25

Question 33

33. Medium duty scaffolding must be able to support how many pounds per square foot loads? (Page 7-42)

Answer 33

50