ADVANCED RIGGING COMPREHENSIVE
QUESTIONS AND COMPLETE SOLUTIONS
TEST PAPER
●● When a load is to be pulled up an inclined plane
Answer: 10% must be added to the load weight to determine the
required pull capacity
●● The WLL for a double-wrapped basket hitch is
Answer: Half that of a double basket hitch
●● Which of the following is a correct statement regarding cribbing?
Answer: 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
Answer: Center of gravity
●● A mobile crane is stable when its leverage on the load is
Answer: Greater than the load's leverage on the crane
●● The gross load that a crane is capable of lifting can be found in the
, Answer: Load chart
●● What crane movement affects the load's center of gravity in relation
to the tipping axis?
Answer: Raising the boom
●● At what wind speed is it advisable to stop lifting operations?
Answer: 30 mph
●● Cribbing is a process in which
Answer: A load is placed on stacked timbers
●● When lifting bundles of rebar, the preferred method is to
Answer: 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?
Answer: The WLL would quadruple
●● At 30 degrees to horizontal, a sling with two legs is carrying what
percentage of the load in each leg?
Answer: 100%
QUESTIONS AND COMPLETE SOLUTIONS
TEST PAPER
●● When a load is to be pulled up an inclined plane
Answer: 10% must be added to the load weight to determine the
required pull capacity
●● The WLL for a double-wrapped basket hitch is
Answer: Half that of a double basket hitch
●● Which of the following is a correct statement regarding cribbing?
Answer: 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
Answer: Center of gravity
●● A mobile crane is stable when its leverage on the load is
Answer: Greater than the load's leverage on the crane
●● The gross load that a crane is capable of lifting can be found in the
, Answer: Load chart
●● What crane movement affects the load's center of gravity in relation
to the tipping axis?
Answer: Raising the boom
●● At what wind speed is it advisable to stop lifting operations?
Answer: 30 mph
●● Cribbing is a process in which
Answer: A load is placed on stacked timbers
●● When lifting bundles of rebar, the preferred method is to
Answer: 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?
Answer: The WLL would quadruple
●● At 30 degrees to horizontal, a sling with two legs is carrying what
percentage of the load in each leg?
Answer: 100%
