test Flashcards
When the load is lifted, swinging is minimized when the ____ is directly above the center of gravity.
hook
most wire ropes have ____ strands.
six
When a chain is about to fail, it _____?
give no warning
friction in rope blocks adds a force of about _____
10% of the weight of the load for each sheave the rope passes around
the strongest rope material is ______
nylon
The working load limit of a wire rope sling is 1000 pounds. Its breaking tension is ?
5000 lbs
the best knot for joining two ropes together is a _____
sheet bend
When using more than one sling to lift a load, attach all the slings to a bolted shackle, then lift the shackle with the hook T/F
true
rigging can be defined as
the process of attaching rope, blocks, and other special equipment on loadstone be moved
describing the equipment used for lifting or lowering loads.
to avoid confusion, all signal directions are given ____?
from the perspective of the operator.
What is the mechanical advantage of a set of blocks with 6 load lines, 3 going into the movable block and 3 coming out of the movable block?
6
when a transformer is to be lifted, a common procedure is to attach the sling to the ____ on the transformer
lifting points
the typical safety factor for wire rope swings is ____
5
The best knot to tie when it is needed to be loosed under strain and then slacked under control is the _____
Munter
When there is a crane-related death, the victim is most often a _____
rigger/signal person
Shock loading is when as object contacts an energized conductor. T/F
false
A half-hitch fiber rope has a breaking strength of 1,200 lbs. the safety factor is 5. the working load limit is ____
240 lbs
Hand Line
Bull line
tag line
pulling rope
- raise and lower materials
- Variety of heavy jobs
- Control loads being raised or lowered
- stringing conductors
nylon rope is
light and flexible
elastic, making it a good choice for absorbing shock loading
good insulator, making it a good choice for live line work
a 2-leg sling is lifting a load weighing 2000 lbs. The length of each leg of the sling is 3 feet. The hook height is 2 feet. The tension in one leg is ____
1500 lbs
If a shackle pin is damaged, it should be replaced with a bolt of the same diameter, secured to the shackle with a rated nut and lock washer. T/F
False
When the sling angle will be small, one solution is to use a _____
Spreader bar
a 2-leg sling is lifting a load weighing 2000 lbs. The legs of the sling are vertical. The tension in one leg is ____?
1000lbs
once the proper equipment for a rigging job has been chosen, the equipment should be ______ to make certain it is in good working order.
inspected
