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UA RIGGING FINAL EXAM 2024-
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A crane shall be set up on footing level within x% 1% what are the four requirements of rope fastening? strong knot, will not slip, tied and untied easily what is the % of swl allowed for a straight/vertical hitch attached to a hook on a load? 100 what % of swl for a choker hitch? 75% what % of swl for a basket hitch? 200% how do you find the swl for a single vertical wire rope sling? square the diameter and multiply by eight how do you find the swl for a 2 leg bridle sling? wire rope swl x (height/length) x 2 how do you find the swl for a 3 and 4 leg bridle sling? same formula as two leg but with 3 instead of 2 multiplying the product what is regular and lang lay? in a lang lay, the wires or yarns are wound the same way as the strands are around the core. in a regular lay, the wires or yarns are wound in the opposite direction as the strands around the core.
how do you find the swl for a piece of rope based on the breaking strength? divide the breaking strength by the safety factor. True or false: regular right laid rope should be uncoiled counterclockwise true True or false: all natural fiber rope is biodegradable true What is a lay? (as a noun) the distance it takes to make one complete wrap or revolution with a strand First grade or #1 manila can be identified by? the inner wound colored strip what is the strongest synthetic fiber rope mentioned in chapter 1? nylon rope size is designated by which dimension? diameter what is the first step in any rigging operation? determine the weight of the load what is the swl multiplier for manila rope? 20 what is the swl multiplier for polypropelyne? 40 what is the swl multiplier for nylon or polyester? 60 What is the swl multiplier for polyethylene? 35 how do you find the swl of a particular rope using the rule of thumb? take the diameter and convert it to eighths, then take the numerator and square it. multiply the product by the specific multiplier for the type of rope (i.e 35 for polyethylene) a splice, even on a new rope, reduces the load carrying ability by what percentage? 15%
increase which hitch is actually a fixed knot that will not slip under strain? clove hitch t/f, wire rope can be uncoiled in the same manner as manila false t/f, a wire rope with a 6 x 7 classification is referred to as coarse laid true t/f, wire rope is a piece of precision machinery true t/f, rigging in the pipe trades requires more flexible wire rope true t/f, wire rope should be kept clean and lubricated true what do the terms regular lay and lang lay refer to? direction of winding of the strands and the wires in the strands wire rope is designated in size by what dimension? its diameter at the widest point if the lay is visibly lengthened on wire rope, especially accompanied by a reduction in diameter, what is the most likely cause? stretch when the ultimate load (breaking strength) of a wire rope is divided by the safety factor, the result is called... the working load limit t/f, choker hitches distribute the load equally between two legs of a sling false, basket hitches do that t/f, a sling wrapped around a rectangular load in a basket is rated at the full basket hitch working load limit false t/f, wire rope is seldom used for slings in hoisting heavier materials since the flexibility is not as good in wire rope as manila
false t/f, choker hitches distribute the load equally between two legs of a sling basket hitches do that! a one inch wire rope sling eye with no thimble lifting on the bow of a one inch shackle will be approximately how efficient? 100% efficient when slinging a bundle of pipe or tubing, which would provide the best contact between sling and load?
a) double basket b/ bridle hitch c/ two double wrap choker hitches d/ single leg choker two double wrap choker hitches Using two slings to lift a load, at what degree angle to the horizontal is the load on each sling considered to be equal to the weight of the load? at the 30 degree mark keep sling angle at not more than how many degrees for maximum security and good practice? 45 degrees if the load is rigid on a three or four legged sling, for purposes of determining individual sling loads what's a good rule of thumb? two slings should be able to equally split the weight of the load where is the maximum rating of a crane? at fixed length and near its vertical position extend boom Two hands: both fists in front of body with thumbs pointing outward.
hoist signal
Extend Boom (One Hand) one fist in front of chest, thumb pointing outward and heel of fist tapping chest.
tower travel
lower boom raise load
lower boom
dog everything
use main hoist
raise boom lower load
retract boom
Retract Boom (one hand) One hand: one fist in front of chest with thumb tapping chest.
travel one track lock the track on side indicated by raised fist. Travel opposite track in direction indicated by circular motion of other fist, rotated vertically in front of body; for land cranes only ___ rope should be light in color with a silvery or pearl luster and a waxy surface. Manila Polypropylene rope is about ___ times stronger than manila rope. 1 3/ ___ rope is manufactured in "film" form rather than extruded filaments and then shredded into fine strips to form fibers.
A ___ hitch is used for attaching the end of a rope to an object for a right-angle pull, as in the case of guy lines. clove A ___ will not slip or draw tight under heavy loads. double sheet bend A ___ is used to attach a hook such as a tackle block at any point on a rope between its ends. catspaw knot A ___ hitch is used to hold a load or to lower a heavy load slowly. snubbing The total length of rope needed for making a ___ hitch equals two barrel lengths, plus one circumference, plus four diameters. barrel Improved plow steel (IPS) has an average tensile strength of ___ pounds per square inch. 240, When wire rope has a natural finish, it is referred to as ___ finish. bright Any number of strands may be laid around a core; by far the greatest number of wire ropes made have ___ strands wound around a core. six The ___ classification usually has seven wires per strand and is referred to as coarse laid rope. 6 x 7 A rope is said to be ___ lay rope if the wires in the strands are wound in the same direction as the strands are wound around the core. lang The ___ construction strand has the same number of outer and inner wires. seale Wire rope is designated by the ___. diameter at its widest point ___ wraps of the seizing wire around a wire rope are recommended for seizing. 8
Discard a fitting if the hook opening has increased by ___ percent from new. 10 Wear on any individual wire must not exceed ___ of the original wire diameter. one-third Multiple-part slings are referred to as ___ slings or spreaders and are made up of two, three, or four single-part slings placed on a master link bridle ___ is ideal for light loads such as small-diameter copper and steel tubing, or loads that will not exceed 400 to 500 pounds. fiber rope Slings made from ___ materials are probably the most widely used and also the most desirable. wire rope A ___ hitch reduces the lifting capacity of a sling by limiting the ability of the wire rope's components to adjust while under strain. choker ___ are made from a length of wire rope formed into a loop and spliced either mechanically or hand tucked. grommet slings It is always good practice never to use a sling when the legs form an angle less than ___° with the horizontal plane of the load. 45 ___ are actually small inverted slings at the ends of wire rope. sling eyes Eye splices equal ___ percent of the SWL of wire rope up to 3/4-inch diameter. 90 When a chain sling is hooked back on itself, it forms a choker, and the rating is reduced by ___. 1/ When inspecting chain, if stretch exceeds ___ percent, replace the chain. 3 The surrounding area within ___ feet of a load must be cleared of debris to prevent the downwash air from helicopter rotors from scattering the debris.
A(n) ___ is a piece of mechanical construction equipment used to move materials too heavy to be easily and safely moved by hand. crane If equipment contacts an overhead wire, the safest thing to do is to ___. stay put Most crane signals are made with the ___. right hand When a(n) ___ alarm is given or when leaving a crane overnight, ground chocks must be set on truck and crawler cranes. wind All persons involved in a hoisting operation should be warned to ___. keep clear of moving cables or ropes The ___ is generally responsible for the safety of a crane operation as soon as the load is lifted clear of the ground. crane operator ___ and OSHA require the use of approved crane and hoist signals. ANSI The ___ type of chain hoist is the one most frequently used in the piping trades. spur gear The ___ on a chain hoist is designed as the weakest part and will spread when overloaded. lower hook The ___ chain hoist is the most efficient of all chain hoists. spur gear When drifting loads using two or more chain hoists, the angle of lift should not exceed ___ degrees with the vertical. 30 According to the number of ___, blocks are designated as single, double, or triple. sheaves The ___ has the simplest construction and employs the basic lever-and-fulcrum principle. ratchet jack
___ are the most versatile general purpose jacks and permit safe lifting, lowering, skidding, and leveling. ratchet jacks A ___ is sometimes called a come-along or a lugall. cable winch hoist Jacking metal against metal is not permitted; use ___. wood softeners There are ___ types of chain hoists used for lifting purposes three The diameter of a wire rope loop is a minimum of ___ times the rope diameter. eight ___ are installed in the eyes of wire ropes and give the eyes a definite shape while providing a wearing surface. thimbles The strength of a socket is equal to ___ percent of the wire rope strength. 100 ___ hooks are designed to prevent the cutting and chafing of wire rope slings. choker ___ are fittings that are used to connect other rigging hardware together, such as hooks to eyes or eyes to rings. shackles Shackles are sized by the ___. diameter of the steel in the bow section ___ must be used with all round pin shackles. cotter pins It is recommended that all ___ used for hoisting be made of alloyed steel and equipped with shoulders. eye bolts A ___ should be used when connecting a hook to an eye. shackle ___ links are the most popular because their shape puts the small part of the link on a hook
2,000 lbs The minimum depth of thread engagement for a 1/2 inch eyebolt into a steel object is: 3/4" Given a 1/2 in steel walled empty cylindrical tank that is opened at one end, calculate its weight (round answer to the nearest hundred). 1800 What markings are required on hoists? the manufacturer, model number, rated load, and re-inspection due date Which of the following markings are required on lashing? the reinspect due date, rated load A motor that weighs over 80 of the capacity of the rigging gear used in the rigging operation is considered a critical rigging operation is considered a critical rigging operation. false Increasing the sling angle from horizontal _______ the stress in the sling. decreases The area of this triangle with dimensions given in feet is: 24 sqft What is the minimum grade of chain required for chain slings? grade 80 Two people should be used to pull the hand chain of a manual chain hoist when it gets too hard for on person to pull. false Sling angle stress could contribute to an overload even if the slings selected had enough capacity to carry the total load weight. true Which of the following attachment points can be used at full capacity when pulled at any angle from vertical? swivel hoist rings To find sling angle stress... multiply the weight in the attachment point with the angle factor
Who is required to perfom an inspection prior to using rigging gear, and what is this inspection called? the user, pre-use inspection Detailed written procedures are required for every rigging operation. false The rigging operating envelope contains the rigging gear and miscellaneous equipment covered by P- 307 section 14, the load itself and... the load rigging path, the gear or equipment's supporting structure When a load is left suspended unattended from a chain hoist it must be secured. How is the chain hoist secured the chain is tied off or pad locked What is the efficiency of a knot or bend? 75 Never bend a wire rope around a diameter _______ itself. smaller than To whom or to what are the majority of crane and rigging accidents attributed? personnel error What is the name of the knot or hitch shown below? (blue rope) clove hitch a straight-line hitch is good for _____ of a sling rated load? 100% What must be used to tighten a swivel hoist ring to the manufacturer's requirements? a torque wrench Attachment point #1 is 6 feet from the center of gravity (CG) and attachment point #2 is 3 feet from the center of gravity (CG). There is a 10,000 lbs load attached. What is the correct equation to find the weight distribution for attachment point #1? 3 divided by 9 multiplied by 10,000 (3 / 9 x 10,000) It is ok to tie a know in or install a bolt into a chain sling leg to shorten the sling. false When rigging gear covered by p-307 section 14 fails while suspended from a structure and drops the load it is a:
Which of the following shackles must never be side loaded? round pin shackle What is the best way to prevent a load from singing when it is lifted using a crane or hoist? center the hook over the cg of the load A padeye with a cracked weld may be used if the crack does not extend more than one half the length of the weld. false A shackle must be marked with the rated load, re-inspected due date, and the date manufacture? false A 1/4" steel walled cylindrical tank, open at one end is filled with salt water. Calculate the combined weight of the tank and its contents (rounded to the nearest hundred). ( 1" thick steel weighs 40. lbs/ft2, salt water weighs 64 lbs/ft3) 5,700 lbs The load of a chain hoist can be hooked into itself to form a sling or to choke a load. True Chain slings used in cargo transfer should be inspected annually. false In addition to OEM recommendations, where would inspection requirements be found for below-the- hook lifting devices be found? ASME B30. What are you required to do when moving loads through areas that have small clearance? Take measurements and use a positive means of control Hoist hooks must have latches or be moused during lifting operations. true what is the minimum number of parts of lashing required to support a load 3 If you have an accident with a crane or you find damage and suspect an accident has happened, your first step is to? stop operations as soon as safely possible Rigging hardware such as eyebolts, links, rings, and shackles are required to have a periodic inspection every 2 years.
false In general, you should never place the eye of the wire rope sling around an object that has a diameter greater than 1/ Limit switches or chain stops must not be relied upon to stop the movement of the hoist during load movement. true The size of shackle that can be used in the eye of a wire rope sling must be ________ the wire rope size? equal to or greater than Calculate the tension in leg A 1,607 lbs You can hang a chain fall from staging to lift a load as long as it looks like it can handle the load being lifted. false A box has 27 cubic ft of sand in it. sand weighs 105 lbs per cubic ft. the box weighs 1,200 lbs empty. the correct equation to find the total weight is? 27x105=2,835+1,200= 4,035 lbs An angular pull of 45 degrees is allowed on non shouldered type eye bolts? false The volume of the cylinder is ______ cubic feet
When a sling is used in a choker configuration, its capacity is decreased what type of rigging operations would removing and replacing a highly sensitive electronic cabinet be considered? complex When a side-load is placed on a shackle, what is the shackle rated load reduced by? 50% What must you do if you have any doubts about the capacity of a padeye? contact the cognizant technical code or engineering for assistance
