UA Rigging

Pataasin ang iyong marka sa homework at exams ngayon gamit ang Quizwiz!

Polypropylene rope is about ___ times stronger than manila rope.

1 3/4

When a chain sling is hooked back on itself, it forms a choker, and the rating is reduced by ___.

1/4

Discard a fitting if the hook opening has increased by ___ percent from new.

10

Many localities require that, when operating a crane, the clearance around power lines may never be less than ___ feet.

10

Even with a new rope, a splice, regardless of the type, reduces the load-carrying ability of the rope by ___ percent.

10 to 15

The strength of a socket is equal to ___ percent of the wire rope strength.

100

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.

100

Improved plow steel (IPS) has an average tensile strength of ___ pounds per square inch.

240,000

When inspecting chain, if stretch exceeds ___ percent, replace the chain.

3

When drifting loads using two or more chain hoists, the angle of lift should not exceed ___ degrees with the vertical.

30

The basic weight of 1 square foot of steel that is 1 inch thick is about ___ pounds (lb).

40.83

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

If the angle of tilt of a load is more than ___ degrees, the load should be rerigged.

5

No unauthorized person shall be allowed to approach within ___ feet of a helicopter when the rotor blades are turning.

50

A knot has only ___ percent of the strength of the rope.

50 to 60

The ___ classification usually has seven wires per strand and is referred to as coarse laid rope.

6 x 7

___ wraps of the seizing wire around a wire rope are recommended for seizing.

8

Eye splices equal ___ percent of the SWL of wire rope up to 3/4-inch diameter.

90

___ and OSHA require the use of approved crane and hoist signals.

ANSI

___ rope should be light in color with a silvery or pearl luster and a waxy surface.

Manila

___ rope is manufactured in "film" form rather than extruded filaments and then shredded into fine strips to form fibers.

Mylar

A steel ___ is a structural shape consisting of a bent plate with some additional metal at the center for strength.

angle

The lifting and landing of a load is controlled by standardized ___ signals.

arm

The total length of rope needed for making a ___ hitch equals two barrel lengths, plus one circumference, plus four diameters.

barrel

A ___ is formed by simply bending the rope and keeping the sides parallel.

bight

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

When wire rope has a natural finish, it is referred to as ___ finish.

bright

A ___ is sometimes called a come-along or a lugall.

cable winch hoist

All electrically operated ___ shall have an electrical activating device so designed and installed as to prevent inadvertent operation.

cargo hooks

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 reduces the lifting capacity of a sling by limiting the ability of the wire rope's components to adjust while under strain.

choker

___ hooks are designed to prevent the cutting and chafing of wire rope slings.

choker

The ___ of a circle (or the distance around the edge of a circle) is found by multiplying the diameter by π (3.1416).

circumference

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

___ must be used with all round pin shackles.

cotter pins

A(n) ___ is a piece of mechanical construction equipment used to move materials too heavy to be easily and safely moved by hand.

crane

The ___ is generally responsible for the safety of a crane operation as soon as the load is lifted clear of the ground.

crane operator

A(n) ___ knot is the first step in making a back splice.

crown

To calculate the weight of materials other than steel plate, the calculation is normally based on the weight per ___.

cubic foot

he most important step in any rigging operation is ___.

determining the weight of the load to be hoisted

Wire rope is designated by the ___.

diameter at its widest point

Shackles are sized by the ___.

diameter of the steel in the bow section

Sizes of rope used in the piping industry are designated as ___.

diameters

A ___ will not slip or draw tight under heavy loads.

double sheet bend

The diameter of a wire rope loop is a minimum of ___ times the rope diameter.

eight

When hoisting with helicopters, give the ___ signal if any damage is noticed.

emergency stop

The weight of an external load attached to a helicopter shall not exceed the ___.

equipment manufacturer's rating

It is recommended that all ___ used for hoisting be made of alloyed steel and equipped with shoulders.

eye bolts

___ 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

A(n) ___ knot is the best knot to use to keep the end of a rope or fall from running out of a tackle or pulley.

figure eight

To properly handle and care for rope, use at least a ___-to-one safety factor based on the minimum breaking strength of rope.

five

If a steel angle is ___, the result is a plate.

flattened out

___ are made from a length of wire rope formed into a loop and spliced either mechanically or hand tucked.

grommet slings

A ___ is primarily used to finish off other knots and should not be used by itself for lifting.

half hitch

The ___ shall be responsible for the size and weight of a load as well as the manner in which the load is connected to the helicopter.

helicopter operator

A ___ distorts and crushes rope fibers, causing fatigue and rapid wear of the rope.

hockle

Employees shall not perform work under hovering crafts except when necessary to ___.

hook or unhook the load

All persons involved in a hoisting operation should be warned to ___.

keep clear of moving cables or ropes

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 ___ on a chain hoist is designed as the weakest part and will spread when overloaded.

lower hook

Wear on any individual wire must not exceed ___ of the original wire diameter.

one-third

___ links are the most popular because their shape puts the small part of the link on a hook

pear shaped

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

Most crane signals are made with the ___.

right hand

The ___ construction strand has the same number of outer and inner wires.

seale

A ___ should be used when connecting a hook to an eye.

shackle

___ are fittings that are used to connect other rigging hardware together, such as hooks to eyes or eyes to rings.

shackles

According to the number of ___, blocks are designated as single, double, or triple.

sheaves

If thimbles are loose in the eyes when inspecting a fiber rope, ___ the eyes to tighten the thimbles.

sieze

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

___ are actually small inverted slings at the ends of wire rope.

sling eyes

A ___ hitch is used to hold a load or to lower a heavy load slowly.

snubbing

The ___ chain hoist is the most efficient of all chain hoists.

spur gear

The ___ type of chain hoist is the one most frequently used in the piping trades.

spur gear

A(n) ___ knot is used for tying together two dry ropes of the same size and for tying the two ends of a rope together when used for backlashing.

square

When plates are rolled into tanks, the ___ of such parts needs to be determined before calculating the weight.

square foot area

If equipment contacts an overhead wire, the safest thing to do is to ___.

stay put

One safety practice to follow when hoisting loads with helicopters is to grasp only ___ to prevent fingers being crushed.

the sides of the cables

___ are installed in the eyes of wire ropes and give the eyes a definite shape while providing a wearing surface.

thimbles

There are ___ types of chain hoists used for lifting purposes

three

All helicopter hoisting operations must have at least ___ signaling systems.

two

It is common practice to make ___ whippings before cutting a rope and to cut between the whippings, eliminating the possibility of them unraveling.

two

Memorizing one basic weight and ___ formula(s) will give a journeyworker a reasonably accurate estimate of weight.

two

Only the ___ is authorized to de-energize, insulate, or handle power lines.

utility company

The formula for calculating the ___ of a steel plate is length x width x thickness/height x density (of steel).

weight

When a(n) ___ alarm is given or when leaving a crane overnight, ground chocks must be set on truck and crawler cranes.

wind

Slings made from ___ materials are probably the most widely used and also the most desirable.

wire rope

Jacking metal against metal is not permitted; use ___.

wood softeners

The area of a circle is equal to ___.

π x r2


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