Advanced Rigging – Questions with Complete Solutions 100% Correct Answers Cribbing is used to - Correct Answers Support a load of the ground When a load is to be pulled up an inclined plane - Correct Answers 10% must be added to the load weight to determine the required pull capacity The WLL for a double-wrapped basket hitch is - Correct Answers Half that of a double basket hitch Which of the following is a correct statement regarding cribbing? - Correct Answers 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 Answers Center of gravity A mobile crane is stable when its leverage on the load is - Correct Answers 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 Answers Load chart What crane movement affects the load's center of gravity in relation to the tipping axis? - Correct Answers Raising the boom At what wind speed is it advisable to stop lifting operations? - Correct Answers 30 mph Cribbing is a process in which - Correct Answers A load is placed on stacked timbers When lifting bundles of rebar, the preferred method is to - Correct Answers 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 Answers The WLL would quadruple 1 / 2
At 30 degrees to horizontal, a sling with two legs is carrying what percentage of the load in each leg?
- Correct Answers 100%
- / 2
When hoisting bundles of bars 30 feet or longer, always use - Correct Answers A spreader bar The closer the angle of the sling to the horizontal, the - Correct Answers Greater the tension on the sling When should an approved lift plan be reapproved? - Correct Answers 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 Answers Crane placement Capacities for crawler cranes that have outrigger extensions may not exceed - Correct Answers 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 Answers 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 Answers 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 Answers Load weight To read a lattice boom crawler crane load/capacity chart, the operator must first know the - Correct Answers Boom length and load radius Equipment condition is categorized under which part of a lift-plan? - Correct Answers Weight The person in charge of planning a critical lift is the - Correct Answers Rigging superintendent