Rigging Flashcards
NAme the fastening method which prevents fraying and does not increase the size of the end of the rope.
Whipping or seizing
A permanent-type loop may be made in the end of a rope by forming an ____ splice.
eye
Name the three rope parts used in tying knots and hitches
- running end
- standing part
- bight
When a loop is needed at any point between the ends of a rope, what is the proper knot to tie?
bowline on a bight
Name the knot that is easier to untie and is larger and stronger than the overhand knot
Figure eight knot
Compared to the strength of a rope, how much do knots usually develop?
50-60%
The knot which is used to complete a barrel hitch is called the ____
bowline knot
True or False - The catspaw knot is ideal for tying two smaller knots together.
False
True or False - The single sheet bend should be used for tying two ropes together of equal diameter
False
What is the SWL formula
D2(squared) X 8
How many times should seizing wire be wrapped around wire rope to make an adequate seizing?
8
How many wire rope seizings are required for 1/2” wire rope
2
Name the three basic hitches which can be used for lifting with a sling
- straight lift
- choker hitch
- basket hitch
Why should the angle between the leg of a sling and the load never be less than 30 degrees?
The smaller the angle, between the leg and the horizontal plane of the load, the greater the tension on the sling legs when force is applied.
Sling eyes are actually small ____ slings at the end of wire rope.
inverted
_____ hitches distribute the load equally between the two legs of a sling.
basket
As the boom on a crane ______ or the operating radius _____ the hoisting capacity of the crane decreases.
lengthens, increases
Chain hoists should be equipped with an automatic load ____ to prevent the load from dropping
break
When it is desired to change the direction of pull in a tackle system, it is necessary to use a ___ block
snatch
The size of the block is determined by measuring the length of the ____
Shell
A come-along is actually a:
lever ratchet, winch-hoist with self-storing aircraft cable
What are the 4 basic types of jacks
ratchet
screw
hydraulic jack with integral pump
hydraulic jack with separate pump
The materials used under the lowered load to provide clearance for the removal of the rigging are generally
heavy timbers
The first step to verify rigging details is to
“document the load”
Which of the following knots is used to attach a hook such as a tackle block at any point on a rope between its ends? catspaw, half hitch, single sheet bend, snubbing hitch
catspaw
Rules for using a crane do not allow the hoist rope to be wrapped around the load. What should be used?
the load should be attached to the hook by means of a sling
Even if one wire rope clip is installed incorrectly, efficiency of connection may be reduced up to
40%
The sling configuration that compresses the load and prevents it from slipping out of the sling is the
double wrap choker hitch
A typical block is sized by measuring
the shell
What is another name sometimes given to a cable winch hoist?
come-along
What is another name sometimes given to a cable winch hoist?
come-along
Which sling configuration is not suited to long, loose bundles since the load/materials can fall out?
single choker hitch
Applied prior to cutting rope, wrapping with wire, cord or tape to prevent unraveling is called
seizing
What is the material used under a load to provide clearance for rigging and facilitate future handling, sometimes also called cribbing, called?
dunnage
What is the following formula for: [.7854 x D2(squared) x length x density]
Calculating the load weight for cylinders
What is the following formula for? [L x W x H x D]
Calculating the load weight of rectangular materials
Name two types of clips for forming eyes in wire rope
J Bolt and U Bolt
What is the weakest part of a chain hoist? Why?
The lower hook, it will spread when overloaded
The ____ gear chain hoist is the most efficient of all chain hoists
Spur
Chain hoists should be equipped with an automatic load ____ to prevent the load from dropping
Break
When it is desired to change the direction of pull in a tackle system, it is necessary to use a ____ block
Snatch
The size of the block is determined by measuring the length of the _____
Shell
