Tpc 318 Flashcards
Determine the weight of a 50ft, s15 X 42.9 beam
W= w/ft X L
The horizontal force increases as?
The angle called the sling angle becomes smaller
If both end of a sling are attached to the hoist hook and a load is suspended from the center of the sling, which hitch is being used?
Basket hitch
What is the sorting hook designed for
It has a point designed to fit in holes
What is a reason for removing a hook from service and replacing it?
If there is any bend it twist from the plane of the unbent hook
If a wire rope is classified as 6 X 37 what does that mean
There and 6 strands , each of which is made up of 37 wires
The following factors all affect wire-rope strength, in which one is the D/d ratio important?
Bending the rope over a curved surface
When properly installed, speltered and swaged sockets provide how much efficiency
100%
What condition should be considered reasons for removing a wire-rope sling from service?
Rope distortion in the form of kinking
Grade 80 alloy steel chain is the ONLY chain recommended for overhead lifting applications, it’s identified as
Grade 80 or 800
What limit is comparable to the rated load specification for wire rope
Working load limit
At what temperature should alloy steel chain be removed from service?
If it has been subjected to 1000 degrees Fahrenheit/ 540 degrees Celsius
Metal mesh slings have standard fittings readily available, both types can be used in vertical and basket hitches. But type 1…
Has a slot for use in a choker hitch
What is a condition when you should recommend removing a metal mesh sling from service if?
A broken welded joint or broken brazed joint along the edge of the sling fabric
What is the strongest of the synthetic fiber ropes and the most popular?
Nylon
Describe a thimble
A thimble should be used in the loop called the eye or loop eye, the thimble is a specially shaped metal sling accessory. It maintains a relatively large radius at the end of the eye where the rope would otherwise be pulled into a sharp bend
What is damage that may warrant removing the sling from service
Distortion in the form of kinking
The tubular cover is color-coded to indicate?
The sling capacity
Damage that should be considered cause for removing a synthetic-web sling from service are
Scorching
How do manual overhead chain hoist operate
When the operator pulls on the hand chain, it turns a pocket wheel
How do gravity operated limit switches in electric wire rope hoists work
The limit switch is activated when the load block comes into contact with a weight or lever at its upper limit of travel. The switch opens the hoists lifting control circuit and interrupts power to the hoist motor
What is the difference between underhung and top-running crane lies in?
How the end trucks of the bridge beams are supported
When should hoist brakes be checked?
Before each shift, lift the load several inches and stop to make sure that the load block and load do not drift downward, if the braking system holds the load, then lifting can continue
What are reasons for removing wire rope from hoist services
Two broken wires adjacent to a socketed end fitting
If signaling is required in a crane operation that involves several people…
The operator must respond to a stop signal from anyone
Operating practices you should observe when using floor-operated hoists and cranes include the following
Make certain that the load will not contact any obstructions
Don’t not use metal mesh slings in which…
The spirals are locked or do not move freely
What is one hook turning
In the turning method, one edge of the load serves as the pivot for the turn
What should you do before lifting the load
Check the location where it is to be set, make certain that the area is large enough. Set the blocks or other holding devices in place. The load should never be moved to the desired location and then left suspended while the blocks are found and placed
How high can scaffolding be
No more than four times the scaffolds shorter base measurements
Hydraulic scissor lifts can support what
They can support two workers with their tools and equipment, or a total weight of about 1500lbs
What is a lifeline
It’s a rope strong enough to bear the workers weight, suspended from a sound part of the structure being worked on
What is a turnbuckle used for
It’s an excellent tool for tightening the wire to the proper tension
What should wood ladders not be coated with
Opaque paint, it might obscure unsafe conditions in the wood
