Final Certification Exam for Advanced Rigging

Cribbing is used to - CORRECT ANSWER-Support a load of the ground When a load is to be pulled up an inclined plane - CORRECT ANSWER-10% must be added to the load weight to determine the required pull capacity The WLL for a double-wrapped basket hitch is - CORRECT ANSWER-Half that of a double basket hitch Which of the following is a correct statement regarding cribbing? - CORRECT 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 - CORRECT ANSWER-Center of gravity A mobile crane is stable when its leverage on the load is - CORRECT ANSWERGreater than the load's leverage on the crane The gross load that a crane is capable of lifting can be found in the - CORRECT ANSWER-Load chart What crane movement affects the load's center of gravity in relation to the tipping axis? - CORRECT ANSWER-Raising the boom At what wind speed is it advisable to stop lifting operations? - CORRECT ANSWER-30 mph Cribbing is a process in which - CORRECT ANSWER-A load is placed on stacked timbers When lifting bundles of rebar, the preferred method is to - CORRECT 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? - CORRECT 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? - CORRECT ANSWER-100% When hoisting bundles of bars 30 feet or longer, always use - CORRECT ANSWER-A spreader bar The closer the angle of the sling to the horizontal, the - CORRECT ANSWER-Greater the tension on the sling When should an approved lift plan be reapproved? - CORRECT ANSWER-If there is any deviation from the original lift pla