Exam (elaborations)
MA 1A Hoisting Questions and Answers 2024
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Exam of 3 pages for the course mass hoisting at mass hoisting (MA 1A Hoisting)
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MA 1A HoistingBroken wires on standing rope - answer2 broken wires in 1 lay beyond end connections,
more then 1 at end connection
Broken wires on rotation resistant wire rope - answer2 broken wires in 6 rope diameters
4 broken wires in 30 rope diameters
Any wire protruding from the core
Most common type of cable - answer Right regular lay
Running rope safety factor - answer3.5 to 1
Standing rope safety factor - answer3 to 1
Rotation resistant rope safety factor - answer5 to 1
Sling Safety factor - answer5 to 1
Strongest to weakest hitch - answerBasket, vertical, choker
Types of hitches - answerBasket, Choker, Double basket, Double Choker
Lower sling angle - answerGreater tension - preferred angle 60 degrees
Minimum wraps on a drum - answer2
More lays on a drum - answerLine pull decreases
Eccentric Reeving - answerCauses torsion on boom
Type of sling used when handling boom sections - answerSynthetic slings
Center of gravity - answerBelow lowest point of attachment = stable load
Remove rigging from service when - answerKinking, crushing, bird caging had occurred.
OSHA - 10 randomly distributed wires in 1 rope lay or 5 wires in 1 strand in 1 rope lay or
1 wire protruding from the core
Outer wires are worn by 1/3 of its normal diameter
OSHA 1910.184 - answerSling hooks must be replaced if throat has opening more than
15% of the original opening or twisted more than 10%
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