Millwright - Rigging and Hoisting Exam Questions With Verified Answers

Millwright - Rigging and Hoisting Exam Questions With Verified Answers 1. Of a block and tackle with five rope falls and minimum friction, how much force is needed to retain 250lbs? a. 50 lbs b. 100 lbs c. 250 lbs d. 75 lbs - answera. 50 lbs 250lbs/5 = 50 lbs 2. What diameter rope is needed to support two tons using a vertical lift? a. ½" b. ¾" c. 1" d. ¼" - answera. ½" 3. What is the standard safety factor to consider for a platform supporting people? a. 1 : 1 b. 5 : 1 c. 10 : 1 d. 15 : 1 - answerc. 10 : 1 4. If a wire rope has a breaking strength of 15,000 lbs, determine the safe working load under normal lifting conditions. a. 2,000 lbs b. 3,000 lbs c. 5,000 lbs d. 15,000 lbs - answerb. 3,000 lbs 5:1 safety factor 15000lbs / 5 = 3000lbs 5. Given a rope strength of 12,650 lbs, and splicing the rope reduces strength by 25%, determine the new rope strength for normal rigging conditions. a. 1897.5 lbs b. 948.75 lbs c. 1000 lbs d. 2300 lbs - answera. 1897.5 lbs [12650 lbs/5(safety factor)] x 0.75 =1897.5 lbs 6. What type of lifting technique has the least lifting capacity (if all use the same rope)? a. Basket hitch b. 2 part Bridle c. Vertical hitch d. Choker sling - answerd. Choker sling 7. What type of sling presentation will accept 200% of the SWL?