Crane questions well answered rated A+ 2023/2024

Cranethree factors that determine crane capacity - correct answer 1. weight of crane 2. strength of components 3. stability 6x25 wire rope is what class wire rope? - correct answer 6 x 19 List 4 causes of bird caging - correct answer 1. Sudden release of tension 2. Sheaves too tight 3. Torsional unbalance 4. Shock loading What is the % efficiency of a Flemish eye? - correct answer 90% What is duty cycle? - correct answer Performing a duty with a crane that is constant and that will fatigue the crane. What is the recommended way to block up a crane? - correct answer At least 3x the outrigger pad area Define gross load - correct answer Gross load is the sum of the weights of attachments, lift, rigging, ropes, etc. List 5 parts of a lattice boom section - correct answer 1. Picture frame 2. Chords 3. Lacings 4. Pin connection lugs 5. Diagonals (sectional support) How must brakes be tested? - correct answer By holding the load a couple inches off of ground The unit weight of concrete is? - correct answer 150 lbs per square foot List 3 types of shackles - correct answer 1. Round pin 2. Screw pin 3. Safety bolt What kind of wire rope clips should be used? Drop forged or malleable iron? - correct answer Drop forged What are the broken wire criteria for running rope on a crane? - correct answer 3 broken wires in 1 strand, 1 lay or 6 randomly broken wires in 1 rope lay What are the broken wire criteria for taking rotation resistant wire rope out of service? - correct answer 2 broken wires in 6x diameter 4 broken wires in 30x diameter What must be done to operate a crane on a barge? - correct answer •Tie down or anchor crane to deck •Use list chart When measuring wire rope it needs to be measured more than once, what are the criteria? - correct answer 3 for 6 strand 4 for 8 strand > peak to peak Shackle must be large enough to avoid _______ of synthetic slings - correct answer Pinching ________ of crosby shackle bows and pins is accepted as long as load is reasonably centered - correct answer Point loading Where angular loading is expected _____ or ______ bolts must be used - correct answer Shoulder eye bolts Or Machinery eye bolts Only _____ eye bolts shall be used for angular lifting - correct answer Shoulder *ASME B30.26* What are the unit weights of water, steel, concrete? - correct answer Water = 62 lbs/ft3 (foot cubed) Steel = 490 lbs/ft3 Concrete = 150 lbs/ft3 The capacity of a four-legged sling may be the same as _____ if one leg is longer than the others - correct answer Two leg or three leg Eye and jaw turnbuckles are _____ for overhead lifting - correct answer Suitable When a single sling leg is placed in a shackle, _____ the shackle to best align the rigging - correct answer Orientate A 30° sling angle has a load multiplier of _____ - correct answer 2 If 45° sling angle has a load multiplier of _____ - correct answer 1.4 (1.414) A 60° sling angle has a load multiplier of _____ - correct answer 1.2 (1.15) Do not allow include an angle greater than _____ - correct answer 90°