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BU3 Advancement > Bu basic CH7 > Flashcards

Bu basic CH7 Flashcards

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

manila and sisal

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

80%

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

three

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

cable laid

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5
Q
  1. 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)
A

shroud laid line

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

1 3/4 inches

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

12 inches

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

breaking strength safe working load (SWL) and safety factors

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

safety factor

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

core

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11
Q
  1. 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)
A

15

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12
Q
  1. 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)
A

performed

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13
Q
  1. 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)
A

37

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

200,000-220,000 psi

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

260,000

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16
Q
  1. 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)
A

5

17
Q
  1. 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)
A

4%

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

75%

19
Q
  1. 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)
A

wedge socket

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

30%

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

80%

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

tackle

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

fall

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

20

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

snatch blocks

26
Q
  1. 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)
A

mechanical advantage

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

runner

28
Q
  1. 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)
A

mousing

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

wood and prefabricated

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

60

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

two

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

25

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

50

BU3 Advancement (27 decks)

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