advanced Rigging NCCER test questions and answers

Rigging material Slings, bolts, shackles, eyebolts, chains and hoists inspect rigging material everyday, before each use what rigging practice should you do rated load safely lifting without breaking minimum breaking strength osha requires rigging material to have a _ for every manufracturer to be 20 % more listed. worn out by 10 percent when should you discard a Hook 5 throat of the hook must not be open by _ % point loading load placed near on the tip of the hook, should be avoided at all cost eyebolts __________, a type of rigging hardware, are available in three basic designs: unshouldered, shouldered, only for VERTICAL lifting swivel hoist rings made for angular lifting, 100% efficient no load is derated. 1.5x you encounter a blind hole, the depth of the must be _x the thread diameter turn buckles lengthen or shorten sling legs, jaw to jaw and eye to eye 2 types of turn buckles used in RIGGING spreader beams used to lift long and flexible loads, along with unbalanced loads equalizer beams used to hoist a load with an off center of gravity. 125 all beams must be tested at _ of rated capacity ASME B30.9 which ASME provides info on slings and their applications wire rejection criteria Kinking, birdcaging, and crushing must be discarded poly slings which sling is the least conductive and the better all around stress the lower the sling angle the more _ sling angle factor length / height sling stress The total amount of force exerted on a sling. This includes forces added as a result of sling angle. Sling stress formula weight of load/# of slings and then times the Sling angle factor. each sling is pulling the full weight of the load what happens if the sling angle is 30 degrees? 45-60 degrees whats the optimal angles for slings in rigging? 45 or less what angles are considered hazardous Synthetic rope which rope/sling has the highest strength to weight ratio? block and tackle Fixed pulley and a movable pulley are used together D/d ratio diameter of the load divided by the body diameter of the sling prevent wrapping slings to small diameter loads, what is the D/d ratio used for 25 wire rope D/d ratio must be at the minimum of line pull weight of the load, (coefficient of friction x weight of the load if load is on ramp) coefficient of friction the ratio of the force of friction to the normal force acting between two objects mechanical advantage the more parts of line do you have, the more inside to inside you should measure the length of slings from reeving a rope system in which the rope travels around drums and sheaves parts of line number of ropes between the upper and lower blocks of a block and tackle block load Block factor x line pull