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Rigging > Chapters 3 & 4 > Flashcards

Chapters 3 & 4 Flashcards

1
Q

The Back Splice prevents what?

A

The Back Splice prevents the end of a rope from fraying and is not subject to loading.

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2
Q

Identify the locations of a rope when tying a knot:

A
  • The standing point: The longest part of the rope
  • The running end: Is the free end of a rope used to form a knot
  • The bite: is a loop formed by placing the running end of the rope parallel to the standing part of the rope
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3
Q

The efficiency rating of an Eye Splice

A

95%

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4
Q

The efficiency rating of a Short Splice

A

90%

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5
Q

The efficiency rating of a Bowline

A

65%

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6
Q

The efficiency rating of a Clove Hitch

A

60%

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7
Q

The efficiency rating of a Square Knot

A

60%

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8
Q

The efficiency rating of Knots that Choke

A

50%

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9
Q

The weakest point of a rope is?

A

At the knot or splice

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10
Q

If a rope’s catalog breaking strength is 1000 pounds and a bowline is tied in it, the rope will break at how many pounds?

A

650 pounds

1000x0.65=650

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11
Q

If a rope’s catalog breaking strength is 1000 pounds and a running bowline is tied in it, the rope will break at how many pounds?

A

500 pounds

1000x0.50

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12
Q

When installed correctly, _______ are almost as strong as the rope itself, whereas a ____ can significantly reduce the strength of a rope.

A

splices, knot

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13
Q

Name the 3 different types of rope used in the power delivery industry.

A
  • Natural Fiber
  • Synthetic Fiber Rope
  • Wire rope
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14
Q

Manilla rope has limitations because?

A

It is subject to rot, and many companies prohibit its use entirely.

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15
Q

What conditions must exist on a natural fiber rope for OSHA demand that it be immediately removed from service?

A
  • Abnormal wear
  • Powered fiber between strands
  • Broken or cut fibers
  • Variation in the size or roundness of the strands
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16
Q

How is synthetic rope different from natural fiber rope?

A

Synthetic, or man made, fiber ropes have individual fibers running their entire length, rather than short overlapped fibers.

17
Q

Characteristics of Duraplex rope:

A
  • Each strand consists of a combination of polyester and olefin fibers which produce an excellent strength to weight ratio.
  • Breaking strength: 6700lbs
18
Q

Characteristics of Tenex rope:

A
  • This rope is Samthane coated polyester with excellent abrasion resistance and durability in addition to its high strength.
  • Breaking Strength: 11800lbs
19
Q

Name the different types of wire rope used in the power delivery industry.

A
  • Mild plow steel wire rope
  • Plow steel wire rope (stronger than mild plow)
  • Improved plow steel wire rope (stronger than plow)
20
Q

________ plow steel wire rope is considered to be the strongest.

A

Improved

21
Q

Ropes should be _____ and ___ when stored.

A

clean, dry

22
Q

Ropes should be hung how?

A

In neat coils devoid of kinks or twists.

23
Q

True or false: Chemicals are not known to damage ropes and is not possible for them to weaken the strength of the rope.

A

False

24
Q

How often should you remove debris from ropes?

A

At every opportunity.

25
Q

Catalog Breaking Strength (CBS) is:

A

The average force in pounds needed to break a rope.

26
Q

Working Load Limit (WLL) is:

A

the maximum load that should ever be applied to the rope.

27
Q

Define: Design Factor

A

An arbitrary number (usually 5 for ropes) used for calculating WLL. The CBS is divided by the Design Factor to determine the WLL.

28
Q

Define: Dynamic Loading

A

occurs when ropes are subject to sever exposer conditions.

29
Q

What are some examples of Dynamic Loading?

A
  • Shock loading
  • Excessive use
  • Exposure to high temperatures (elongates the strands)
  • Extended periods under load

Rigging (4 decks)

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