Practice crane test Flashcards
What is the percent of capacity of a triple chain compared to two legs
150%
Defined the mechanical advantage of the block to the winch
Can multiply pulling power,
safe working load of cable increases equal to the parts added
What are the broken wire removal criteria for rotation resistant wire rope
Two random broken wires and six diameters or four randomly broken wires and 30 diameters
What is rope lay length
The length of the strand to make one full revolution around the wire rope
Define fleet angle
The angle drawn from the boom tip sheave to the ground and other line from the boom tip sheave to the center of the outer most flange of the boom hoist
1.5° smooth 2° grooved
What are the wear criteria for taking wire rope out of service
1/3 wear of the original outside dimension
Name four types of cranes
Rough terrain
All-terrain
Crawler mounted
Carrier mounted
Give two reasons why one Crane in a two crane pick would intentionally be given more weight
One crane has a higher capacity
Offset center of gravity
Give two causes of the majority of crane accidents
Wind, erratic swing, improper set up, human error
What type of bolt is used for angular lifts
Shoulder eyebolt
The rule of thumb is that all sheaves should have a D/d ratio of
20/1
What is overhaul weight
The weight needed to pull the line off the drum
What is the efficiency of a Flemish eye
90%
What is the termination efficiency of a wedge socket
80%
Being off level results in?
In accurate radius, invalid load chart, uncontrolled swinging, tipping
Wire rope sling capacities
Single leg___%?
Single choker___%?
Two leg vertical_____%?
Single leg 100%
Single choker 75%
To like vertical 200%
What is the minimum D/d ratio for boom hoist sheaves , boom tip sheaves, hoist block sheaves
Boom hoist sheaves 15/1
Boom tip sheaves 18/1
Hoist block sheaves16/1
Seven rejection criteria for chain slings
Heat damage, 5% stretch links, cuts, bent links, 10% wear, welded links, weld splatter. 4:1 safety factor
What is the allowable throat opening on a hook due to wear of original dimension?
5% 1/4”
ANSI B30.5 OSHA1926 sub part cc
Safety and health regulations for cranes in derricks in construction
List five things to look for when inspecting wire rope
Broken wires, kinks, core Protrusion, corrosion, bird caging, Electrical contact
What are the broken wire removal criteria for wire rope terminations?
One broken wire at the end fitting, no more than two broken wires beyond the end fitting
What’s three basic functions of blocks
Increase permissible line pull, change of direction, change of speed
What are four causes of bird caging
Pulling through tight sheaves, shock loading, sudden stops, rope wound to tight on drum
What is the termination efficiency of a swage socket
100%
The D/D ratio of shackle to Flemish I should be
One size greater
Define the fleet angle standards for drums
1.5° smooth, 2° grooved
What is sideloading
When the hoist line or load is not directly under the boom tip
What is gross load
The weight of a load plus all deductions
Termination efficiency for a spelter socket
100%
What is the formula for the number of clips required to make a wire rope turn back eye
Three times the diameter +1
List three factors that determine crane capacity
Crane stability, structural competence, Crane configuration, crane deduction
What is the formula that determines tension in a sling
Weight of the load divided by number of legs times the L/H factor
List five criteria that determine a critical lift
Two crane pick, over 75% of capacity, specialized rigging, personnel lift, working within table A
List five parts of a lattice boom section
Pin connections, picture frame, main cord, diagonal, lacing, lattice members
What is cabling
What are multipart block spends 90° and different parts touch
What are two precautions to take when extending the hydraulic boom
Extend evenly, cable down to prevent 2 blocking
Define load radius
Distance from boom center pin to load being lifted
List two categories and load chart capacities
Structural/stability
What is gross capacity
The number found in the load chart
What are the removal criteria for a rope slings
Five broken wires and one strand and one lay, 10 randomly broken wires in one lay 
 what is the load applied to test rigging gear
125% for five minutes
What is effective weight
The weight of an object in comparison to its placement on the crane
Name five parts of wire rope
Core, strand, center wire, wire rope, wire
Describe daily inspection
Inspection to be done at the beginning of each shift no records needed
Describe periodic inspection
1 to 12 months intervals, must be recorded by a qualified person
What is the unit weight of steel
490 pounds per cubic foot
Define boom angle
The line drawn from the center of the boom to the horizontal
The included angle of a hook is
90°
The operator shall test the brakes each time a load is approaching the rate of a load or is handled by
Slightly lift the load off ground, apply brakes and make sure they hold
The horizontal lines indicate what are at the range diagram
Tip height or elevation
Rope must extend at least six times the rope diameter be on the wedge socket and be
No less than 6 inches
Rotation resistant wire rope must extend____times the diameter four tail on a wedge socket and be_______
20
No less than 6 inches
What is jib angle to the ground
Main boom angle minus jib offset angle
Above the bold line on a load chart represents what
Strength
Unit weight of water is what
62 pounds per cubic foot
Load chart capacity is based on the following percentages:
Outrigger
85%
Rubber
75%
Crawler
75%
____ is the maximum load that can be applied to working gear in service
SWL WLL
What is the best way to reeve a block and why
Even parts symmetrically, to avoid tours in loading the boom tip
What is wear the criteria for hooks
10% wear, 5% wear in critical areas
What is ductility
The point of material can stress or flex without failure
What is a range diagram
Shows cranes working range, Boom tip height, radius, boom angle
How much more capacity does a four legged sling have versus a three legged sling
Zero
Double leg basket must not be use that a sling angle less than____°
60°
3° off level can’t lose as much as ____ capacity
50%
How many gallons per cubic foot
7.48 gallons
What is the formula for the volume of a cube
Length X width X height
What is the formula for the volume of a cylinder
Pi X radius squared X length
Wire rope core is____% stronger than fiber core
7.5%
List three types of shackles
Pin, screw, bolt
Name a type of wire rope that has a tendency to untwist
Lang Lay
Testing a crane after repairs shall not exceed___% of manufacturers load rating
110%
Sorting hooks should be used at what angle? What happens to it 7 1/2 ton weight load limit when tip loaded
45° and is reduced to 2 tons
What is D/d ratio
Ratio of hardware diameter compared to the wire rope diameter
Duty cycle has _____% reduction from the rated capacity
20%
Rigging gear fails at
Ultimate breaking strength
What is the minimum number of wraps on a hoist drawn
2 wraps 
What do the vertical lines indicate on a range diagram
Load radius
What is the definition of lay in reference to wire rope
Rope lay signifies direction of wires and strands
What would you use to lubricate wire rope
Light mineral oil that is not a corrosive and does not hinder rope inspection
What is WSC
Wire strand core
How do you determine parts of line required
SWL/PLP which ever is lower divided by the weight of suspended load
What does a range diagram illustrate
Placement, boom length, Boom angle, load radius, jib and Jib offset, load height
What is fatigue
Material being stressed to the point of failure
What is IWRC
Independent wire rope core
