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Plumbing 2nd Period > Rigging PART A > Flashcards

Rigging PART A Flashcards

1
Q

Only One type of natural fibre rope is sturdy enough for lifting what is it

A

Number one grade manila

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2
Q

Fibre rope is constructed by what method

A

Reverse twisting

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3
Q

How are ropes formed

A

Fibres right hand twisted into yarn, several yarns are left hand twisted into strands. Then 3or 4 strands are right hand twisted to form a right lay rope. Reversing this is a left lay rope

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4
Q

What rope is used for most general purposes

A

Medium-lay rope

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5
Q

These ropes provide more abrasion resistance

A

Hard lay ropes

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6
Q

These ropes have higher tensile strengths

A

Soft lay ropes

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7
Q

Two types of synthetic fibre rope commonly used

A

Nylon and polypropylene

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8
Q

What synthetic rope is excellent for use in such industrial applications as anchor and tie up lines tag lines and couplers and safety ropes

A

Nylon

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9
Q

Rope is light in weight, does not absorb moisture, and floats on water, and the most popular rope available

A

Polypropylene rope

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10
Q

What does it mean when a yard is broken

A

The rope has been overloaded and is not safe for hoisting

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11
Q

If a rope is frozen do you let it thaw before using

A

Yes

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12
Q

Cutting a natural rope what do you do

A

Ends must be taped or whipped with fine twine

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13
Q

How efficient is a rope with a knot in it

A

50%

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14
Q

How efficient is a straight line pull

A

100%

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15
Q

How big does a sheaves diameter need to be greater than the ropes diameter

A

6-10x

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16
Q

T or F the plumbing industry tends to use wire rope as lashing

A

True

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17
Q

Ropes with many wires to a strand have a good resistance to what

A

Bending fatigue

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18
Q

Wire rope grade Used where maximum tensile strength is required, such as mine shaft hoisting

A

Grade 120/130 - special improved plow type 11

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19
Q

Wire rope Used where a higher ultimate load (UL-BS) is required

A

Grade 115/125- special improved plow type 1

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20
Q

The grade most commonly used for wire rope, it combines tensile strength wear resistance and fatigue resistance

A

Grade 110/120 improved plow

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21
Q

Wire rope that Has excellent wear and fatigue resistance but a lower tensile strength

A

Grade 100/110- plow

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22
Q

What method is used for constructing fibre rope

A

Reverse twisting

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23
Q

How to calculate working load limit

A

Diameter squared X 8= WLL in tons

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24
Q

Type of connection recommended in all hoisting slings with a sling eye

A

Flemish eye plus a pressed metal sleeve

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25
Q

Synthetic webbing slings are weakened and damaged by

A

Repeated use of hoisting rough and sharp edged objects

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26
Q

The preferred material for synthetic webbing slings

A

Nylon

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27
Q

Capacity of a double ply sling over a single ply sling

A

140% -200%

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28
Q

Chain that is suitable for construction hoisting is stamped with what

A

Identifying letter or number in the links
Usually letters A and T or versions of the number 8 as 80 or 800

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29
Q

Chains in regular use should be checked how often

A

Once a month

30
Q

If a chain is subjected to shock or impact loads what do you do

A

Inspect it immediately before putting back in service

31
Q

Using what will make your chain inspection efficient

A

Use a magnifying glass

32
Q

What percent of chain wear do you replace slings

A

10% or more

33
Q

What do you do if a chain has stretched by 3%

A

Inspect carefully

34
Q

If the chain is stretched more than 5%

A

Chain should be removed from service

35
Q

Definition: formed when the end of the rope intertwined within a section of the rope

A

Knot

36
Q

Rope term: formed by intertwining two rope ends

A

Bend

37
Q

Rope term: formed by fastening a rope to an object, such as a ring, hook or post

A

Hitch

38
Q

Rope term: made by joining the ends of two ropes

A

Splice

39
Q

How much does a knot in a rope affect its strength ?

A

50%

40
Q


How much does a bend in the rope affect the strength? 

A

50%

41
Q

What does a hitch in a rope affect the strength? 

A

Reduces strength by 25%

42
Q

How much does a splice reduce rope strength?

A

Reduced 20%

43
Q

This knot does not slip easily 

A

Bowline knot

44
Q

 this knot is used for hoisting, safety lines and for hitching around posts and rings

A

Bowline knot 

45
Q

This knot is used for tying two ropes together that are equal equal diameter or for making a secure loop in the end of the rope

A

Figure of eight knot

46
Q

 This hitch is used for fastening a rope to a post or pipe 

A

Clove hitch

47
Q

This hitch is strong and virtually slip proof useful for securely attaching a rope to a post or column 

A

Round turn and 2 half hitches

48
Q

This hitch is mainly used for lowering or hoisting, planks, pipe tube and bars 

A

Timber hitch

49
Q

This bend is used to join lightweight to medium weight ropes of two different diameters 

A

Sheet bend

50
Q

This bend is one of the strongest knots and can be used for securely joining together large diameter ropes 

A

Carrick bend

51
Q

This hitch is used for attaching a rope to a hook 

A

Catspaw

52
Q

These hoists are used to lift loads in a straight line vertical position 

A

Chain hoists

53
Q

In this chain hoist the difference in the number of pockets is the differential 

A

Differential chain hoist

54
Q

These chain hoist are more expensive than differential hoists

A

Screw geared chain hoist

55
Q

This chain was uses two separate chains. One is an endless chain.

A

Screw geared chain hoist

56
Q

The most efficient type of manual chain hoist, but also the most expensive

A

Spur geared chain hoist

57
Q

This device is useful for short, vertical and horizontal pulls

A

Come along

58
Q

Typically, the most abused piece of equipment

A

Come along

59
Q

a cable winch that uses a draw vise design and permits unlimited wire rope travel 

A

Tirfor

60
Q

The winch can only be used on the horizontal plane

A

Tirfor winch

61
Q

This block is used to change the direction of pole on a wire rope

A

Snatch block

62
Q

The tap screw bolts must have the minimum depth of what the diameter of the

A

1.5x

63
Q

How is a shackle sized

A

The diameter of the bow section

64
Q

What direction pulls are shackles intended to be used?


A

Vertical

65
Q

At what percent do you destroy shackles? 

A

Worn in the crown Or in the pin by more than 10% of the original

66
Q

All lifting hooks except grab chain and sorting hooks should be fitted with what

A

Safety latches

67
Q

When two more slings to be used, the slings must go to a what

A

Shackle or ring

68
Q

These devices counter the twisting of rigging when hoisting

A

Swivels

69
Q

Crane hooks with a single part line should use this device

A

Headache ball

70
Q

This device is used to attach the headache ball

A

 wedge socket

71
Q

Angular pulls should be avoided on these clamps

A

Beat clamp

72
Q

How do you calculate the amount of u bolt saddle type clips

A

Rope diameter x3 + one to next whole number 

Plumbing 2nd Period (16 decks)

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