Rigging Final Exam Questions and Answers 100% Verified

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Rigging Final Exam Questions and Answers 100% Verified According to OSHA, what conditions require synthetic fiber rope to be removed from service? ✔✔It must be removed from service if there are ... signs of abnormal wear, powdered fibers between the strands, broken or cut fibers, variation in size or roundness of strands. One major manufacturer lists their 1/2" three strand rope as having a catalog breaking strength of 5600 lbs. Using the industry standard design factor, determine the working load limit. ✔✔5600/5 = 1120lbs working load limit Which knot is often called the king of knots? ✔✔The Bowline. It is easily untied after supporting a heavy load. What are OSHA's requirements for inspecting wire rope? ✔✔They There are two variations of the square knot that should be avoided for rigging purposes. What are they? ✔✔The thief knot, because the tension is crossways it does not perform as well as the square knot. The grief or "whatknot" is a trick knot and often falls apart when tension is applied. What is the efficiency rating of a bowline on a bight? ✔✔It is 65% efficient. What is the efficiency rating of a running bowline? ✔✔It is 50% efficient. What is the efficiency rating of a clove hitch? ✔✔It is 60% efficient Explain what it helps to begin a splice with a tracer strand. ✔✔Start by tucking the tracer strand back into itself, this gives you a good reference point to start the splice. How far must the tails project beyond the last full tuck in 3/4" rope? ✔✔The tails must project at least six rope diameters for all rope 1" and under. Which of the following splices is not rated for efficiency? a. eye splice b. short splice c. back splice ✔✔c. Back splices prevent the ends of a rope from fraying and therefore has no efficiency rating According to the text, which of the rigging configurations is used for setting poles? ✔✔Choker The name tag of a sling reads "EE2-802". What does it mean? ✔✔EE refers to eye and eye, 2 refers to the number of plys, 8 is the grade of material, 02 is the width in inches. What is the insulation rating of a web sling? ✔✔Synthetic web slings are non-conductive but are not considered insulated Explain how to protect slings and ropes from sharp corners or edges. ✔✔Sharp edges or corners should be covered or padded before using a sling or rope What is the most common use for type "CO" chain sling in the power delivery industry? What does "CO" stand for? ✔✔They are commonly used for setting poles. C stands for choker, O stands for oblong master link on the ends What is the minimum grade of chain required for hoisting, or lifting or rigging? ✔✔Must be a minimum Grade 80 Alloy. What type of shackle is to be used for attaching insulators to structures, and never for rigging? ✔✔Material shackles According to the text, what is the most common type of wear associated with chains? What is the effect on the links? ✔✔Stretching and wear at the end of each link. Stretching causes thinning of chain diameter Follow OSHA requirements for minimum allowable size. Explain the proper method of using a shackle and a wire rope sling in a choker configuration. ✔✔The load must be handled from the pin end and the center of the body. Never side load a shackle. Lifting a 500lb load with two slings, calculate the sling tensions below a. Sling length = 10 and sling height = 10 b. Sling length = 10 and sling height = 8 c. Sling length = 9 and sling height = 6 d. Sling length = 9 and sling height = 4 ✔✔a. 10/10 x 500/2 = 1 x 250 = 250 b. 10/8 x 500/2 = 1.25 x 250 = 312.5 c. 9/6 x 500/2 = 1.5 x 250 = 375 d. 9/4 x 500/2 = 2.25 x 250 = 562.5 Calculate the following snatch block tensions lifting a 2900lb load. a. SBT 1 at 120 degrees b. SBT 2 at 90 degrees c. SBT 3 at 45 degrees d. SBT 4 at 90 degrees ✔✔a. 2900 x 1.1 x 1 = 3190 x 1= 3190 b. 3190 x 1.1 x 1.41 = 3509 x 1.41 = 4947.6 c. 3509 x 1.1 x 1.84 = 3859.9 x 1.84 = 7102.2 d.3859.9 x 1.1 x 1.41 = x 1.41 = 5986.7 Explain the importance of proper digger derrick positioning ✔✔They should be leveled using the outriggers. Out of level vehicles can increase the weight on the turret and cause stability problems. What is the purpose of the digger derrick load angle chart and what information can be found on it? ✔✔It lists the lifting capacities at different angles and extensions of length. The operator can use the load angle chart to confirm that it is safe to lift a particular load. To do so, the operator must know what information? ✔✔The position of the boom and the operational zone, and the weight of the object being lifted. In what position is the boom strongest? ✔✔It is strongest when fully retracted at its highest angle. In what position is the boom weakest? ✔✔It is weakest when fully extended at its lowest angle. What should the operator of an areal lift always do regarding the override controls before operating the equipment? ✔✔Ensure that the ground personnel qualified to operate the equipment is present. Ensure the override controls are functional and in good repair. List the key safety considerations when driving a backhoe on a public roadway? ✔✔Drive slow on uneven surfaces. Remember the backhoe is wider than other vehicles Stop well back of stop signs to ensure the bucket is not in the intersection Keep the bucket low enough to see but high enough to clear slopes Be aware the bucket can cross the center-line on sharp corners. Avoid this Remember the hoe is very tall when stowed. watch for low limbs and service drops. What should employees do with regard to the hoe's swing arm radius? ✔✔All workers should stay out of the swing arm radius. When excavating on a slope, why should the spoils be placed on the uphill side? ✔✔If the spoils are placed on the downhill side it can risk the stability of the backhoe. [Show More]

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