Rigging Final Advanced Exam (Q&A

Rigging Final Advanced Exam (Q&A) According to OSHA, what conditions require synthetic fiber rope to be removed from service? - CORRECT ANSWER-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. - CORRECT ANSWER-5600/5 = 1120lbs working load limit Which knot is often called the king of knots? - CORRECT ANSWER-The Bowline. It is easily untied after supporting a heavy load. What are OSHA's requirements for inspecting wire rope? - CORRECT ANSWER-They There are two variations of the square knot that should be avoided for rigging purposes. What are they? - CORRECT ANSWER-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? - CORRECT ANSWER-It is 65% efficient. What is the efficiency rating of a running bowline? - CORRECT ANSWER-It is 50% efficient. What is the efficiency rating of a clove hitch? - CORRECT ANSWER-It is 60% efficient Explain what it helps to begin a splice with a tracer strand. - CORRECT ANSWER-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? - CORRECT ANSWER-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 - CORRECT ANSWER-c. Back splices prevent the ends of a