Tom Midterm Test Questions and Complete Solutions Graded A+

Tom Midterm Test Questions and Complete Solutions Graded A+ Rigging involves choosing the appropriate _ to support the load weight, attaching them to the _ equipment, and arranging them properly to _ the load - Answer: components, lifting, balance What are the primary concerns when planning a lift? - Answer: weight, location, balance, load shape, path Other than the primary concerns listed in the previous question, what are some other considerations that need to be taken into account when preparing for a lift? - Answer: Load shape, path, location, landing areas How can load weight be determined if the laod does not consist of stock shapes and total weight information is not available - Answer: Calculated from load/s area and/ or volume based on measurements of actual dimensions A load must be lifted from directly over the _ in order to maintain balance - Answer: Center of gravity What must be determined so that a load remains stable and level when lifted? - Answer: center of gravity of load A _ load is a load in which one half of the load is a mirror image of the other half - Answer: symmetrical load An _ load is a load in which one half of the load is substantially different from the other half - Answer: asymmetrical _ loads always tilt towards the center of gravity - Answer: unbalanced Without performing center of gravity calculations, how can load balance be checked? - Answer: lift three inches The vertical location of the lift points in relation to the center of gravity also affects the stability of a load - Answer: True The relative distances of the lift points from the center of gravity determine their share of the _ - Answer: load What is a lifting lug? - Answer: Thich metal lug for lifting An _ is a bolt with a looped head that is fastened to a load to provide a lift point - Answer: eye _ are pressed into their closed loop shape in a process that keeps the steel strong - Answer: forged loops Only formed steel eyebolts should be used for lifting applications - Answer: False List three common types of eyebolts - Answer: machinery, regular nut, shoulder nut The _ eyebolt is the most commonly used eyebolt - Answer: machinery Nut eyebolts have a shoulder that butts up against a threaded nut - Answer: False Angular forces should only be applied to an eyebolt that is firmly supported...,.fgsadkjfsad - Answer: True the load capacity of an eyebolt is greatest when it is pulled - Answer: vertically when are slings needed? - Answer: no existing attachment points List the sling types used in rigging and lifting applications - Answer: vertical, bridle, basket, choker What is a sling hitch? - Answer: sling with a loop at both ends A _ hitch consists of two or more straight slings of the same type that bring together multiple lifting points on the load to a single hoisting point - Answer: bridle A _ hitch uses one sling that is looped under the load so that both ends can be connected to the hoist - Answer: basket Basket sling loads are commonly used with loads such as pipes, bars, or poles that are drawn together in a bundle - Answer: false What is a sling angle? - Answer: Angle bhetween horizontal of sling Greater sling angles result in greater sling forces - Answer: false If angular forces cause a flexible load to buckle, a _ can be added to the rigging to change the direction of the forces on the load - Answer: spreader bar Lesson 2 - Answer: Lesson 2 _ is a length of fibers or thin wires that are twisted or braided together to form a strong and flexible line - Answer: rope How is fiber rope constructed - Answer: twisting fibers into yarn, then into strand, then strands into rope Define the term yarn when it is used for the construction of rope - Answer: A continuous linear fiber twisted together Define the term strand when it's used for the construction of rope - Answer: Several pieces of yarn or wire twisted spirally around an axis The _ is a designation for the direction in which the strands are twisted... - Answer: lay A _ is a rope in which the yarn or wires in the strands are twisted in the opposite direction to the lay of the strands - Answer: regular lay rope Which type of rope lay is identified by its yarn or wires crossing the axis of the rope at approximately 45 degrees? - Answer: long lay ropes List an advantage and a disadvantage of lang lay ropes - Answer: flexible, untrusting _ is a rope's tendency to rotate and untwist when under load - Answer: cabling why do rotation resistant ropes require special handling? - Answer: kink, crush, unbalanced A high strength rope has less twist, which is referred to as _. rope with a high resistance to abrasion has more twist, which is referred to as _ - Answer: soft lay, hard lay How is a rope diameter measured? - Answer: calipers Rope wear that reduces strength is indicated by _ - Answer: Abrasion marks, diameter reduction Teh strength rating of rope is based on its - Answer: breaking strength How are safe working load limits for rope established? - Answer: testing samples A _ is the ratio of a component's ultimate strength to its maximum allowable safe working load limit - Answer: safety factor generally, safety factors in rigging and lifting are normally between five and eight - Answer: true a safety factor _ is used for steady or even loads. A safety factor of _ is used for uneven loads or lifts that may shock the slings - Answer: 5,8 Bending a rope over a small diameter can reduce its effective strength by more than _ - Answer: 50% Bending efficiency can be increased when _ are used in rope ends or rope loops - Answer: Thimbles Natural fiber ropes can be used in corrosive chemical environments because natural fibers... - Answer: True _ is the wire wrapping the binds the end of a wire rope near where it is cut - Answer: seizing _ is the twine wrapping that binds the end of a fiber rope near where it is cut - Answer: seizing How is a wire rope classified? - Answer: Strands in rope and # of wires in each strand A _ is a socket that is compressed onto the end of a wire rope - Answer: Swage A _ is a socket that holds a loop of wire rope securely with a wedge that is tightened by tension on the rope - Answer: wedge socket A _ is a socket that uses molten zinc or resin to secure the end of a wire ope inside the socket - Answer: spelter Lay length measurements are used to determine if the rope has - Answer: stretched _ rope consists of an even number of strands woven into a tube shape - Answer: single braid _ rope consists of completely separate and outer braids - Answer: double bond What is plaiting - Answer: wearing of pairs of alternately twisted strands into a rope A splice can retain up to _ of hte original strength of a rope. When joining rope, splices are preferred over knots, which can reduce rope strength as much as _ - Answer: 95%, 50% _ is a splice that finishes a rope end by braiding its loose strands back on itseld - Answer: crowning Lesson 3 - Answer: Lesson 3 The _ is the knot often used to lift or lower an injured person - Answer: bowline Which of the following is not considered to be a hitch? - Answer: sheepshank The _ is the most readily applicable hitch to use when hoisting a load on a hook - Answer: cat's paw A straight rope of any size retains _ of its strength when tied in a bowline - Answer: 50%