rigging
What is the maximum load that should be imposed on a rope for rigging?
1/5 its breaking strength
Correctly installed cable clips will reduce the breaking strength of wire rope by how much?
20%
Up to how much will nylon rope stretch when loaded to the breaking point?
40% of its original length
To prevent cross-bow loading, what is the maximum angle between any two slings to a shackle?
45 Degrees
What is the maximum pull angle that shoulder eyebolts are able to withstand?
45 Degrees to the vertical
What is the mechanical advantage of a block and tackle with two sheaves on the fixed block and two sheaves on the travelling block?
4:1
How much can sharp bends and knots reduce the strength of a rope by?
50%
What is the recommended safe lifting sling angle from the horizontal
60 Degrees
What is the minimum grade of chain that can be used for overhead hoisting?
80
When using two slings to hoist a load, at what angle to horizontal is the stress on the slings the least?
90 Degrees
Which materials handling equipment is commonly known as a pallet truck?
A manual forklift
What is the safety system found in the Tirfor?
A shear pin must break and seize the load when overloaded
What is it called when continuous pounding of a wire rope causes the strands to become flattened, distorted, and brittle?
Abraded
What type of crane is referred to as a gantry or bridge crane?
An overhead travelling crane
When using two slings to hoist a load, what happens to the sling stress as the sling angle to horizontal changes?
As the sling angle decreases, the sling stress increases
What type of synthetic web sling has metal triangles of equal size on each end?
Basket web sling
When knot tying what do you call the portion of the rope that forms the loop?
Bight
What can result from sudden stops or the wire rope being pulled through tight sheaves or winding on too small of a drum?
Bird caging
Which of the knots can form a non-slip loop?
Bowline
How is the size of a jack designated?
By capacity
What part of the loop must the U-bolt part of a cable clip grab onto?
Dead end of the rope
What determines the number of cable clips required for a connection?
Diameter of the rope
When lifting a bundle of pipe horizontally with slings, which hitch is recommended?
Double - wrap basket hitch
What feature does the OHS regulation require on all trolleys?
Drop stops
Choker hitches are a good choice when you need to increase the sling capacity
False
The sound or light signal for "ALL CLEAR" is
Four bells or flashes
What style of hook is designed so the throat fits between the links of a chain?
Grab
Beside allowing the rigger to quickly connect a choker hitch to a load, what other purpose does the design of a choker hitch serve?
It protects the sling from sharp ends at the choker point
What is the safe and proper procedure if during a hoist the load tilts more than 5 degrees?
Lower the lift and rearrange the rigging
What type of manila rope has one or more colored strands?
Number 1 grade
Which type of rope is usually pure white, soft, pliable, and smooth to the touch?
Nylon
The sound or light signal for "STOP" is
One bell or flash
Tag lines should be used to control loads because they allow control from where?
Out from under the load
What is a rigging softener?
Pad used to protect a sling from the sharp corners of a load
Which type of dry rope has the best electrical insulating properties?
Polypropylene
How should you remove new rope from its shipping coil?
Pull it from inside of the coil
Which knot, hitch, or bend would you use to join two ropes of the same diameter together?
Reef knot
What is the term to describe the displacement of wires and strands as a result of wire rope rubbing against itself or another object?
Scrubbing
When several slings are to be attached to a single hook, what is used to make the connection to the hook?
Shackle
Which knot, hitch, or bend would you use to join a large-diameter rope to a small-diameter rope?
Sheet bend
Which lifting device is designed to pull in all positions, uses self-energizing jaws, and has an unlimited amount of cable travel?
The Tirfor
Where is the safety system located on the block and tackle?
The block and tackle has no safety system
Which lifting device is designed for vertical lifting but is limited in any horizontal application?
The chain fall
Which lifting device is designed for short vertical lifts as well as horizontal pulls?
The come-along
How can the mechanical advantage of a pulley system be described?
The effort distance compared to the resistance distance
What is the safety feature found on a cable-type come-along?
The handle bends when overloaded
In wire rope terminology, what does "one rope lay" refer to?
The lengthwise distance for one strand revolution
What happens if you hoist an object with the center of gravity above the lifting points?
The load could topple
If a load is rigged with the center of gravity off to one side, what will happen when it is hoisted in the air?
The load will tilt until the center of gravity is directly below the hook
What is meant by the term center of gravity?
The point at which the object will balance
What is it that enables both of the threaded rods in a turnbuckle to simultaneously tighten or loosen while turning the sleeve in one direction?
The threads are left handed at one end and right handed at the other
What is the definition of the term mechanical advantage?
The use of tools or mechanical devices to multiply force
The sound or light signal for "LOWER" is
Three bells or flashes
Generally, which type of overhead travelling crane has a higher lifting capacity?
Top running
What group of cranes are immobile and commonly used on high-rise construction sites?
Tower cranes
What type of sling is best for loads that are abrasive or hot and require a wide bearing surface?
Triangle end metal mesh sling
Which knot acts like a pulley for tying down a load?
Trucker's knot
The sound or light signal for "RAISE" is
Two bells or flashes
In what conditions are ropes best stored?
Well ventilated
What does the abbreviation WLL stand for?
Working load limit
