Rigging Flashcards
The giant stone slabs of Stonehenge, weighing 40 to 50 tons each, were brought to an upright position using a series of _____and fulcrums.
Levers
In the late 1800s, ironworkers used massive low-slung flatbed carts with___and mules or horses to move machinery from shop to job site
Wheels
The device that converts motion to torque is the____
Wheel
Manila rope is usually made up with___strands
Three
The reversal of twist in the strands gives Manila rope a balance and eliminates the tendency towards______
Unwinding
Which lay of rope is generally recommended?
Medium-layed
____is the best known and have gained the widest acceptance of synthetic fiber ropes.
Nylon
Which of the following types of rope is the strongest?
Nylon
Breaking load, weight and breaking length, load/extension characteristics, and recovery after repeated loadings contribute to a ropes ability to____
Absorb energy
Of all the hazards to which ropes are subjected, perhaps the worst is the effect of____because the damage done may not be apparent on normal examination
Heat
When using synthetic ropes, you must take extra caution because synthetics_____more than manila
Stretch
Which is slightly weaker than the short splice but is able to run through a sheave?
Long splice
Blocks, when reeves, become a_____, which by definition is a device by which forces may be advantageously applied to do work
Machine
Blocks, when reeves, work like a machine and are not 100% efficient because of____
Friction
Which of the following is a sign that the blocks are being overloaded?
Hook shows signs of opening
The length of wire rope is ordered or recorded in____
Feet
Which of the following grades of wire should an ironworker select if he or she desires maximum rope strength?
Grade 120/130 special improved plow type II
The wires and strands in performed rope are___in the manufacturing process to fit their position in the finished rope
Shaped
Fatigue is caused by the constant ___of the rope over sheaves and around drums.
Bending
Where abrasive conditions are severe, which of the following kinds of lay should be used in the rope?
Lang lay
To locate the rope anchorage point on the machine drum in relation to the direction of lay of the rope, use your right hand as a_____to simulate the drum for the right lay ropes.
Fist
The main object in external lubrication is to____.
Fill the gaps between the strands and rope
Where should lubricant be applied for maximum penetration of a rope?
Where it opens up on a bend
To be certain that the ropes spools evenly on the drum, keep tension of approximately ___% of the working load of the rope at all times.
10
Which of the following will best prevent a rope from jumping off of the sheave?
Cable-keepers
If there is evidence of opening or distortion of the hook, you should___.
Destroy the hook
Generally speaking, the larger the___ of a hook, the more load it can hold.
Throat opening
Rings, links, and swivels must be made from_____.
Forged alloy steel
Shackles worn in the crown or the pin area by more than____% of the original diameter should be destroyed
10
It is recommended that all eye bolts and rings bolts used for hoisting be equipped with ____ or_____
Shoulder, collars
All turnbuckles used in hoisting or rigging operations should be of ____.
Weldless construction
Hydraulic jacks are very popular in construction because they are ____.
Compact
If the load can not be raised with the handle supplied, the jack is _____.
Overloaded
What is the most important aspect in rolling?
Control of the load
A come-along that requires the use of a______to move a load is inadequate for the job.
Cheater
Tirfors can be fitted with____to operate the levers
Hydraulic rams
Where are base-mounted winches particularly useful?
Where there is not enough headroom for cranes to operate
What will protect the member and the sling from damage and increase the radius of bending in the sling?
Softeners
The forklift truck is equipped with a____fork secured to the supporting frame.
Two-toned
Forklifts range in load-carrying capacity for 2000 to______pounds.
80000
Which type of pallet is appropriate to be moved with a high-lift pallet truck?
Single-faced
Whenever the temperature is below____, you must exercise extreme caution.
32 degrees Fahrenheit
Rapid____of suspended loads also subjects the equipment to additional stresses, which can cause collapse.
Swinging
The safe working loads of all hoisting equipment apply to_____.
Freely suspended loads on plumb hoist lines only
Three and four-legged bridle slings are given the same_____load as a two-legged sling.
Safe
What is the formula for determining the distance around the edge of a circle?
Diameter x3.14
For an odd-shaped object, the rigger must often use a ___and___method to determine the center of gravity
Trial and error
