Download RIGGING CML MASTERLIST EXAM QUESTIONS AND ANSWERS 2026 - 2027 and more Exams Mining Engineering in PDF only on Docsity!
MASTERLIST EXAM
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END OF PAGE A loss of diameter, often caused by corrosion, of more than [?] is considered reason for removal of the rope from service. - ANSWERS- 10% A [?] is a socket that is compressed onto the end of a wire rope. - ANSWERS-swage socket The use of a(n) [?] is preferred because the heat also fuses the strands and strand wires together. - ANSWERS-cutting torch [?] is wire rope in which the strands are permanently formed into a helical shape during fabrication. - ANSWERS-Preformed rope Wire rope is composed of a core surrounded by strands, each of which is composed of a specific pattern of wires of [?]. - ANSWERS-different sizes
MASTERLIST EXAM
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END OF PAGE [?] is a rope's tendency to rotate and untwist when under load. - ANSWERS-Cabling [?] wire rope is the least susceptible to wear. - ANSWERS-Seale [?] occurs when strands are forced apart and the core material is squeezed out from between the strands. - ANSWERS-Core protrusion Using U-bolt clips, the efficiency of a termination made with clips is approximately [?]. - ANSWERS-80% A(n) [?] forms a loop at the end of a rope by splicing the rope end into the rope body. - ANSWERS-eye splice Out of the three synthetic fiber ropes, which one outperforms the other two in most of the categories? - ANSWERS-polyester
MASTERLIST EXAM
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END OF PAGE In configurations of four parts or more, the speed of each sheave is different. Which sheave moves fastest? - ANSWERS-Nearest to lead line What is the simplest reeving method? - ANSWERS-Lacing A block-and-tackle assembly has four parts and is used to lift a load of 1,000 pounds. The lead-line force is 250 pounds. The lead line is pulled at a 40ยฐ angle from vertical. What is the block loading estimate? - ANSWERS-Block loading = 250 lb ร 1.87 + (1,000-250) Block loading = 468 + 750 Block loading = 1,218 lb A block-and-tackle assembly has three parts and is used to lift a load of 1,200 pounds. The lead-line force is 400 pounds. The lead line is pulled at a 60ยฐ angle from vertical. What is the block loading estimate? - ANSWERS-Block loading = 400 lb ร 1.73 + (1,200-400)
MASTERLIST EXAM
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END OF PAGE Block loading = 692 + 800 Block loading = 1,492 lb What is the minimum force required to lift a 10,000-lb load using a four- part reeving system equipped with plain bearing sheaves? Note: The bend ratio is 15. Therefore, the friction of each sheave adds an additional 7% of the load weight to the total, and the associated friction factor is 0.33. - ANSWERS-Force = Weight ร Friction Factor = 10,000 lb ร 0. = 3,300 lb What is the mechanical advantage of a three-part reeving system? - ANSWERS-3: If the lead line of single sheave is held vertically, how much force would the block experience when lifting a 100-pound load? - ANSWERS- 200 lbs
MASTERLIST EXAM
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END OF PAGE [?] limit switches prevent a hoist hook from impacting a hoist or boom, which would cause damage to the wire rope or chain and potentially overload the motor. - ANSWERS-Upper Slip clutches are designed to slip at [?] to 125% of the hoist's rated capacity. - ANSWERS-110% Hand-chain hoists must be hung [?] so that the hand chain is free to rotate around the wheel. - ANSWERS-vertically A hoist's input shaft turns at a(n) [?] rate than the output shaft. - ANSWERS-faster In a hoist, distance relates to how many more times the input shaft must rotate for the output shaft to rotate [?]. - ANSWERS-once A [?] is a dolly consisting of two forks that are hydraulically lifted above a set of wheels. - ANSWERS-pallet jack
MASTERLIST EXAM
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END OF PAGE Why would you complete a test lift? - ANSWERS-To confirm load balance and stability There must be enough space for the maximum [?] of the crane and its surrounding safe zone while in operation. - ANSWERS-footprint Which one of these conditions would make it a lift complex? - ANSWERS-Hoisting in a nuclear facility When lifting a load that may swing uncontrollably, what is a good method to control the load? - ANSWERS-tag line In a prelift check, what should be done prior to the actual lift to help find any additional issues? - ANSWERS-dry run Many cranes require a firm, graded, and [?] area for initial assembly and operation. - ANSWERS-well drained
MASTERLIST EXAM
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ANSWERS 2026 - 2027
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END OF PAGE Calculate the following asymmetrical rigging scenario. The load to be lifted has lift points 120 inches apart. The center of gravity is located 80 inches from point A. If the load is 9,000 pounds, what is the weight experienced by point B? - ANSWERS-9,000 ร 80/120 = 9,000 ร 0. = 6,000 lb What is the total material weight of a load consisting of 35 pieces of 4- foot by 8-foot steel sheets that are 1/16 inches thick? Note: A steel sheet at 1/16 inches thick weighs 2.55 pounds per square foot (psf). - ANSWERS-4 ft ร 8 ft = 32 ft2 --> 32 ft2 ร 2.55 psf ร 35 pieces = 2, lbs Lifting Force can be measured directly with either a dynamometer or a [?]. - ANSWERS-load cell Calculate the following asymmetrical rigging scenario. The load to be lifted has lift points 120 inches apart. The center of gravity is located 40 inches from point B. If the load is 9,000 pounds, what is the weight
MASTERLIST EXAM
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END OF PAGE experienced by point A? - ANSWERS-9,000 ร 40/120 = 9,000 ร 0. = 3,000 lb If 1/2-inch steel EMT conduit weighs 0.30 pounds per foot, what is the total weight of a bundle of 75 pieces of 20-foot long, 1/2-inch size EMT conduit weigh? - ANSWERS- A large rectangular load is slightly lifted at one end (lift point A), and a dynamometer indicates a force of 6,000 pounds. Then the opposite end (lift point B) is lifted, and the dynamometer indicates a force of 4, pounds. The distance between the lift points is 120 inches. Where is the CG along its length? - ANSWERS-48' What is the total material weight of a load consisting of 20 pieces of 4- foot by 10-foot steel sheets that are 1/4-inch thick? Note: A 1/4-inch thick steel sheet weighs 10.2 pounds per square foot (psf). - ANSWERS- 40 ft2 ร 10.2 psf ร 20 pieces = 8,160 lbs
MASTERLIST EXAM
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END OF PAGE Any cribbing used to support a load before and after a lift must be checked for sufficient [?] and its stability to support the load. - ANSWERS-capacity What reference(s) should be consulted for guidance on appropriate applications? - ANSWERS-both a. and c. (a. ASME B30.9, Slings and c. Sling manufacturer) A wide variety of [?] are available for slings. Most types are D-shaped rings and various hooks. - ANSWERS-end fittings When consulting a sling load chart for rigging using angles between those shown on the chart, which angle should be used? - ANSWERS-the smaller angle Which hitch is typically the most stable way to rig a load for hoisting? - ANSWERS-bridle
MASTERLIST EXAM
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END OF PAGE Which of the following hitches can cause significant wear on the inside of the eye where it contacts the sling body, particularly for wire rope? A shackle can be used to prevent this damage. - ANSWERS-choker T or F: Synthetic fiber slings may be used for hoisting personnel baskets.
- ANSWERS-false Which type of slings typically have greater friction with the load surface, which helps keep them in place? - ANSWERS-synthetic fiber When applying the [?] hitch, care should be taken not to beat the sling down against the load. - ANSWERS-choker The sling angle is [?]. - ANSWERS-the acute angle between the horizontal and the sling leg What is a benefit of using the smaller angle on a sling load chart? - ANSWERS-increased safety factor
MASTERLIST EXAM
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END OF PAGE Binding is an indication that the links have [?] because the sides bow inward and prevent adjacent links from moving freely. - ANSWERS- stretched Identification characters directly on chain links are [?] and include the manufacturer's mark, traceability, or date code. - ANSWERS-raised To prevent slippage of a chain sling, a [?] may have to be utilized. - ANSWERS-lifting beam A two-leg sling has the best load capabilities at how many degrees? - ANSWERS-60 degrees Which chain is showing signs of bent links? - ANSWERS-( D. ) Which chain is showing signs of elongation? - ANSWERS-( C. ) Which chain is showing signs of gouging? - ANSWERS-( B. )
MASTERLIST EXAM
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END OF PAGE Which chain is showing signs of excessive wear? - ANSWERS-( A. ) With multiple leg slings, sling load calculations should be performed to ensure that individual legs of a sling are not overloaded, especially when connected to [?] loads. - ANSWERS-asymmetrical [?] treatment can be used to develop the desired combination of strength and durability in a metal. - ANSWERS-Heat Identification directly on Grade 80 and Grade 100 chain links include [?]. - ANSWERS-all of the above (manufacturer's mark, raised characters, traceability or date code) According to ASME B30.9, chains should be removed from service if the thickness of any part of a link has decreased by [?]. - ANSWERS- 10%
MASTERLIST EXAM
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END OF PAGE Lifting chain is designed to elongate before fracturing as much as [?]. - ANSWERS-15% - 30% Chain costs [?] compared to wire rope of similar strength. - ANSWERS- less Chain for rigging is normally favored over wire rope because chain has approximately [?] times the impact absorption capability and is more flexible. - ANSWERS- 3 The chain sling specifications are identified by the manufacturer on a(n) [?]. - ANSWERS-attached nameplate or tag Chain slings are made by [?] from lengths of chain and rigging hardware components. - ANSWERS-manufacturers
MASTERLIST EXAM
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END OF PAGE Synthetic slings generally include [?] warning yarns within the body that are not normally visible. - ANSWERS-red Web sling strength is based on [?] webbing material. - ANSWERS-new The [?] is the ratio of the strength of a bent rope to its nominal strength rating. - ANSWERS-bending efficiency The [?] is the ratio of the diameter of a bend to the nominal diameter of the rope. - ANSWERS-bend ratio Identify and match the wire rope damage. - ANSWERS-from top to bottom: wear, corrosion, kinking, crushing, broken, bird caging Typically, in lifting and rigging operations, [?] wire rope is used. - ANSWERS-bright Most rigging applications use a safety factor of [?]. - ANSWERS- 5
