crane test
Side loading can occur when: - ANSThe crane is out of level, during rapid swing, dragging or
pulling loads sideways, improperly performed tilt-up operations, or high winds
Crane's leverage - ANSCrane weight times the horizontal distance from the center of gravity to
the tipping axis
Load's leverage - ANSThe horizontal distance from the center of gravity of the load to the
tipping axis times the load weight
Margin of stability for crawler mounted cranes - ANS75%
Margin of stability for carrier mounted cranes - ANSOn outriggers extended 85%
On rubber or tires 75%
Margin of stability for commercial boom trucks - ANS85%
Backward stability factors - ANSOperating over the side, no load, shortest boom length
maximum boom angle, and load on wheels
Overloading the crane will cause: - ANSCrane tipping or structural failure
Capacity charts are normally divided by: - ANSUsing a bold line, asterisks, or shaded area
Structural strength is found on the top or bottom of the capacity chart - ANSTop
Stability is found on the top or bottom of the capacity chart - ANSBottom
What component can fail when operating in the structural area of the capacity chart - ANSWire
rope, boom, block, sheave, boom extension cylinder, boom lift cylinder, ring gear, hydraulic
hoses, outriggers, jib, jib pendants, jib mast, boom pendants,...
If boom length is between chart listings you should: - ANSAlways use lower capacity of the next
longer or shorter boom length
Load radius is: - ANSThe horizontal distance from the center of rotation to the center line of the
hook
If load radius is between chart listings you should: - ANSUse the next longer radius
, Boom angle is: - ANSThe angle between the center line of the base boom and the horizontal
after the load is lifted
Boom deflection will: - ANSDecrease boom angle and increase load radius
Tire deflection will: - ANSIncrease the load radius and decrease the boom angle
If boom angle is between chart listings you should: - ANSUse the next lower boom angle
Gross capacities are: - ANSThe rated capacities listed in the capacity chart
What may need to be deducted - ANSWire rope, ball, jib, load block, rigging, net load, stowed
jib, EXT., AUX. Boom head,...
When do you deduct weight of the crane's hoist rope - ANSWhen the manufacturer specifies in
the load chart, when the crane is reeved with more then the minimum parts of line required,
when the crane is reeved with hoist line not being used to make the lift, or when there are parts
of line below the ground
Net capacity is: - ANSGross capacity minus capacity deductions for load handling devices
Gross load is: - ANSThe net load plus the attachments, lifting devices, hook, blocks, balls, wire
rope, and Rigging
Net load is: - ANSThe actual weight of the item being lifted
Dynamic loading is: - ANSThe forces created by movement
Total load is: - ANSThe combined forces produced by the actual load weight, lifting attachments,
and the movement of the load and attachments
Capacity is limited by: - ANSThe lowest rated component
Parts of line is: - ANSThe number of hoist ropes directly supporting the lower load block
SWL means: - ANSSafe working load
How do you find the minimum parts of line required - ANSAdd the weight of the hook block, the
rigging, and the net load.
Divide the suspended weight by the safe working load of the hoist rope
The range diagram can be used to: - ANSDerive the approximate distances when planning lifts
and determining crane configuration, ect.
Side loading can occur when: - ANSThe crane is out of level, during rapid swing, dragging or
pulling loads sideways, improperly performed tilt-up operations, or high winds
Crane's leverage - ANSCrane weight times the horizontal distance from the center of gravity to
the tipping axis
Load's leverage - ANSThe horizontal distance from the center of gravity of the load to the
tipping axis times the load weight
Margin of stability for crawler mounted cranes - ANS75%
Margin of stability for carrier mounted cranes - ANSOn outriggers extended 85%
On rubber or tires 75%
Margin of stability for commercial boom trucks - ANS85%
Backward stability factors - ANSOperating over the side, no load, shortest boom length
maximum boom angle, and load on wheels
Overloading the crane will cause: - ANSCrane tipping or structural failure
Capacity charts are normally divided by: - ANSUsing a bold line, asterisks, or shaded area
Structural strength is found on the top or bottom of the capacity chart - ANSTop
Stability is found on the top or bottom of the capacity chart - ANSBottom
What component can fail when operating in the structural area of the capacity chart - ANSWire
rope, boom, block, sheave, boom extension cylinder, boom lift cylinder, ring gear, hydraulic
hoses, outriggers, jib, jib pendants, jib mast, boom pendants,...
If boom length is between chart listings you should: - ANSAlways use lower capacity of the next
longer or shorter boom length
Load radius is: - ANSThe horizontal distance from the center of rotation to the center line of the
hook
If load radius is between chart listings you should: - ANSUse the next longer radius
, Boom angle is: - ANSThe angle between the center line of the base boom and the horizontal
after the load is lifted
Boom deflection will: - ANSDecrease boom angle and increase load radius
Tire deflection will: - ANSIncrease the load radius and decrease the boom angle
If boom angle is between chart listings you should: - ANSUse the next lower boom angle
Gross capacities are: - ANSThe rated capacities listed in the capacity chart
What may need to be deducted - ANSWire rope, ball, jib, load block, rigging, net load, stowed
jib, EXT., AUX. Boom head,...
When do you deduct weight of the crane's hoist rope - ANSWhen the manufacturer specifies in
the load chart, when the crane is reeved with more then the minimum parts of line required,
when the crane is reeved with hoist line not being used to make the lift, or when there are parts
of line below the ground
Net capacity is: - ANSGross capacity minus capacity deductions for load handling devices
Gross load is: - ANSThe net load plus the attachments, lifting devices, hook, blocks, balls, wire
rope, and Rigging
Net load is: - ANSThe actual weight of the item being lifted
Dynamic loading is: - ANSThe forces created by movement
Total load is: - ANSThe combined forces produced by the actual load weight, lifting attachments,
and the movement of the load and attachments
Capacity is limited by: - ANSThe lowest rated component
Parts of line is: - ANSThe number of hoist ropes directly supporting the lower load block
SWL means: - ANSSafe working load
How do you find the minimum parts of line required - ANSAdd the weight of the hook block, the
rigging, and the net load.
Divide the suspended weight by the safe working load of the hoist rope
The range diagram can be used to: - ANSDerive the approximate distances when planning lifts
and determining crane configuration, ect.
