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Advanced Rigging – Questions With Complete Solutions
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Advanced Rigging – Questions With Complete Solutions
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Advanced Rigging – Questions With Complete SolutionsCribbing is used to Correct Ans - Support a load of the ground
When a load is to be pulled up an inclined plane Correct Ans - 10%
must be added to the load weight to determine the required pull capacity
The WLL for a double-wrapped basket hitch is Correct Ans - Half
that of a double basket hitch
Which of the following is a correct statement regarding cribbing?
Correct Ans - Softwoods such as pine are generally used for cribbing
The point at which an object is perpendicular to and balanced in relation to
the earth's gravitational pull is known as the Correct Ans - Center
of gravity
A mobile crane is stable when its leverage on the load is Correct Ans -
Greater than the load's leverage on the crane
The gross load that a crane is capable of lifting can be found in the
Correct Ans - Load chart
What crane movement affects the load's center of gravity in relation to the
tipping axis? Correct Ans - Raising the boom
At what wind speed is it advisable to stop lifting operations? Correct
Ans - 30 mph
Cribbing is a process in which Correct Ans - A load is placed on
stacked timbers
When lifting bundles of rebar, the preferred method is to Correct Ans -
Thread sling eyes in the same direction
When using cribbing, what affect on the WLL would be achieved by
doubling the depth of the beams? Correct Ans - The WLL would
quadruple
, At 30 degrees to horizontal, a sling with two legs is carrying what
percentage of the load in each leg? Correct Ans - 100%
When hoisting bundles of bars 30 feet or longer, always use Correct
Ans - A spreader bar
The closer the angle of the sling to the horizontal, the Correct Ans -
Greater the tension on the sling
When should an approved lift plan be reapproved? Correct Ans - If
there is any deviation from the original lift plan
Electrical hazards in the lift area and swing direction and degree are
factors to consider in preparing which portion of a lift plan? Correct
Ans - Crane placement
Capacities for crawler cranes that have outrigger extensions may not
exceed Correct Ans - 85 percent of tipping
When planning a lift involving two cranes, calculate the lowest net
capacities that both cranes will have during the lift. The next step is to
Correct Ans - Make sure that the sum of the lowest rated net capacities
of the cranes exceeds the load weight
A lift plan should be discussed Correct Ans - At a pre-lift meeting
where all personnel involved in the lift are present
In a multiple-crane lift using an equalizer, the weight of the equalizer is
considered part of the Correct Ans - Load weight
To read a lattice boom crawler crane load/capacity chart, the operator
must first know the Correct Ans - Boom length and load radius
Equipment condition is categorized under which part of a lift-plan?
Correct Ans - Weight
The person in charge of planning a critical lift is the Correct Ans -
Rigging superintendent
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