Week 2 (Ropes/Knots/Splices)

Question 1

what are three common types of rope used?

Answer 1

Natural
Synthetic
Wire rope

Question 2

what is generally the only natural fiber rope used for rigging purposes?

Answer 2

1 grade manila

Question 3

manila rope is subject to _____ and many companies __________the use of it?

Answer 3

rot/prohibit

Question 4

natural fiber ropes must be removed from service when what conditions are found?

Answer 4

-abnormal wear
-powdered fiber in strands
-broken/cut fibers
-variations in size or roundness of strands

Question 5

what kind of rope do these characteristics describe?
-high weight and strength ratio/ absorbs little moisture/doesn’t stiffen when wet/good dielectric properties/resistant to damage caused by water, mildew?

Answer 5

Synthetic

Question 6

_______ rope can be 2 1/2 times stringer than _______ of the same diameter?

Answer 6

synthetic/manila

Question 7

synthetic ropes are made out of what materials?

Answer 7

nylon, polyester, polypropylene, polyethylene

Question 8

what are the characteristics of 1/2 inch, three strand synthetic rope?

Answer 8

-6.7 lbs per 100 foot
-catalog breaking strength of 5,800 lbs

Question 9

what is duraplex rope commonly used for?

Answer 9

hand lines

Question 10

what is the catalog breaking strength of 1/2 inch duraplex rope?

Answer 10

6,700 lbs

Question 11

what common situations is tenex rope used for?

Answer 11

pulling and stringing, climbing and rigging

Question 12

what is the catalog breaking strength of tenex?

Answer 12

11,800 lbs

Question 13

what are the limitations for synthetic rope?

Answer 13

strands can melt with heat or flame, sharp edges and abrasions under tension

Question 14

what is considered the strongest wire rope?

Answer 14

improved plow steel

Question 15

what are the three basic grades of steel wire rope from lowest to highest?

Answer 15

-mild plow steel
-plow steel
-improved plow

Question 16

in what obvious situation should wire rope be avoided?

Answer 16

when working with energized conductors

Question 17

what are some problems with use and care of wire rope?

Answer 17

must be kept out of weather, rust can damage on the inside leaving outside looking ok, kinking or bending, broken strands

Question 18

what can sand and dirt do to ropes?

Answer 18

cut individual fibers (synthetic)
rust (wire rope)

Question 19

always ______ ______ _________ and ________ standards for care, use, and inspection of rope?

Answer 19

review manufacture recommendations/
OSHA

Question 20

what is the minimum proper care for ropes?

Answer 20

-clean and dry when stored
-hung in neat coils with no kinks/twists
-remove splinters, thorns, burs, sand and gravel
-avoid contact with chemicals

Question 21

CBS or catalog breaking strength, is defined as what?

Answer 21

average force in lbs needed to break a rope?

Question 22

WLL, or working load limit of a rope is the?

Answer 22

max load that should ever be applied

Question 23

if a rope has a catalog breaking strength, why does it also need a working load limit?

Answer 23

to ensure longevity and integrity

Question 24

what are some other names for WLL?

Answer 24

safe working load, max load value, rated capacity

Question 25

the working load limit (WLL) of a rope is _____ or _____ of the catalog breaking strength (CBS).

Answer 25

1/5 or 20%

Question 26

an arbitrary number used to calculate a ropes working load limit?

Answer 26

design factor

Question 27

what is dynamic loading?

Answer 27

when a rope is exposed to severe conditions and normal working load limit no longer applies.

Question 28

what are examples of dynamic loading?

Answer 28

- shock loading - high temp exposure - excessive use - extended periods under load

Question 29

how do you calculate working load limit?

Answer 29

divide the catalog breaking strength by the design factor

Question 30

what is the WLL of a rope with a standard design factor of 5 and CBS of 7,000 lbs?

Answer 30

1,400 lbs

Question 31

what is the weakest point of a rope?

Answer 31

the knot or splice

Question 32

what is the efficiency rating of a bowline?

Answer 32

65%

Question 33

what is a bowline used for?

Answer 33

used to make a temporary eye

Question 34

if a bowline, rated at 65% efficiency, is tied to a rope with 1000 lbs of CBS, when will the rope break?

Answer 34

CBS (1000) x .65 (65%) =650 lbs

Question 35

what is the efficiency rating of a running bowline?

Answer 35

50%

Question 36

what is a running bowline commonly used for?

Answer 36

when a choke is needed

Question 37

what is the efficiency rating of a bowline on a bite?

Answer 37

65%

Question 38

when is a bowline on a bite used?

Answer 38

when a temporary eye is needed and the available rope is longer than desired

Question 39

both the ______ and _______________ are easily untied even under heavy strain?

Answer 39

bowline/bowline on a bite

Question 40

what is the efficiency rating of a clove hitch?

Answer 40

60%

Question 41

what is the clove hitch used for?

Answer 41

fasten a rope around an object

Question 42

what is the efficiency rating of a square knot?

Answer 42

60%

Question 43

what is a sheet bend used for?

Answer 43

joining two different sized ropes temporarily

Question 44

what is a slip knot used for? when should it not be used?

Answer 44

hoisting tools or materials/under heavy strain

Question 45

what is a grunt knot used for?

Answer 45

tying to a hand line when a hook is not available

Question 46

what is a snubbing knot used for?

Answer 46

controlling tension

Question 47

what is the efficiency rating of a snubbing knot?

Answer 47

50%

Question 48

used to make a permanent eye in the end of a rope or permanently join 2 ends of same sized rope together?

Answer 48

splice

Question 49

what is the efficiency rating of a splice?

Answer 49

95%

Question 50

what is the efficiency rating of a short splice?

Answer 50

90%

Question 51

_____ are almost as strong as the rope. _______ significantly reduce the strength of a rope?

Answer 51

splices/knots

Question 52

used to join the ends of to identical ropes together or remove a damaged portion.

Answer 52

short splice

Question 53

what is a back splice used for?

Answer 53

prevents ends from fraying

Question 54

how many tucks should be used when back splicing?

Answer 54

4