License practice test Part 2 Flashcards
What is gross capacity?
The number found in the load chart, never to be exceeded
What is the broken wire removal criteria for wire rope slings?
5 broken wires in 1 strand in one lay or 10 random broken wires in 1 lay
What is the load that is applied to test rigging gear?
125% for 5 minutes
What is effective weight?
Is the weight of an object in comparison to its placement on the crane
Describe daily inspection
Before each shift
Appointed person
No records needed
Describe periodic inspection
1-12 month intervals
Records kept
Qualified person
What is the unit weight of steel
490lbs/cu ft
Define boom angle
If you drew a line from the center of the boom then to the horizontal
Included angle of a hook
90 degrees
The operator shall test the brakes each time a load is approaching the rated load or is handled,
by
Slightly lift the load off the ground apply the brakes and see if they hold
The horizontal lines represent what on the Range diagram?
Elevation and boom tip height
What is jib angle to ground?
Main boom angle minus jib offset
Above the bold line and a load chart represents what?
Structural competence
The unit weight of water is what?
62 pounds per cubic foot
Load chart capacities for
Outrigger
Rubber
Crawler
Outrigger 85%
Rubber 75%
Crawler 75%
What is the maximum load that can be applied to working gear in service
WLL or SWL
What is the wear criteria for hooks?
5% in critical areas 10% in other areas
5% but no more than a 1/4” in the throat opening
What is the best way to reeve a block and why
Even parts reeved symmetrically to avoid torsion of boom tip
Even to boom odd to block
What is ductility
The point of material can be stretched or flexed without failure
What is a range diagram?
A 2D picture showing crane configuration, radius, Boom tip height and boom angle
How much more capacity does a four legged chain have compared to a three legged chain?
0 capacity only adds stability
How many gallons per cubic foot
7.48 gallons per cubic foot
Double leg basket must not be used at an angle less than?
60 degrees
3 degrees off level can lose as much as
50% capacity
What is the formula for the volume of a cube?
LxHxW
What is the formula for the volume of a cylinder?
3.14 x R2 x length
3.14 x (d x d DIVIDED by 4) x length
Wire rope core is % stronger than fiber core
7.5%
3 types of shakles
Safety pin
Screw pin
Bolt type
Name a type of wire rope that has a tendency to untwist
Lang lay because all the wires go in the same direction
Testing a crane after repairs shall not exceed % of manufacturers load rating
110%
What angle should sorting hooks be used? What happens to the 7 1/2 ton WLL when tip loaded
45 degrees
2 Ton WLL if tip loaded
What is D/d ratio
Diameter of the object/load (D) compared to the diameter of the wire rope (d)
Duty cycle has a % reduction of capacity
20%
Rigging gear fails at
UBS ultimate breaking strength
What is the minimum number of wraps on a hoist drum?
2
What do the vertical lines on a range diagram indicate?
Radius
What is the definition of lay in reference to wire rope
The way the wires fall in the wire rope
What would you lubricate wire rope with?
Non corrosive
Cannot hinder inspection
Recommended by manufacturer
WSC
Wire Strand Core
