Rigging 101 Final Exam (Advanced questions and answers)
Oxygen bottles that are properly secured in a rack or stand designed for lifting/handling would be considered a critical rigging option. - CORRECT ANSWER -false
There are three slings hanging from a hook. Each sling has the capacity of 2,000 pounds. What is the heaviest load that could be lifted using these slings if they were attached to a single point? - CORRECT ANSWER -2,000 lbs
The minimum depth of thread engagement for a 1/2 inch eyebolt into a steel object is: - CORRECT ANSWER -3/4"
Given a 1/2 in steel walled empty cylindrical tank that is opened at one end, calculate its weight (round answer to the nearest hundred). - CORRECT ANSWER -1800
What markings are required on hoists? - CORRECT ANSWER -the manufacturer, model number, rated load, and re-inspection due date
Which of the following markings are required on lashing? - CORRECT ANSWER -the reinspect due date, rated load
A motor that weighs over 80 of the capacity of the rigging gear used in the rigging operation is considered a critical rigging operation is considered a critical rigging operation. - CORRECT ANSWER -false
Increasing the sling angle from horizontal _______ the stress in the sling. - CORRECT ANSWER-decreases
The area of this triangle with dimensions given in feet is: - CORRECT ANSWER -24 sqft
What is the minimum grade of chain required for chain slings? - CORRECT ANSWER - grade 80
Two people should be used to pull the hand chain of a manual chain hoist when it gets too hard for on person to pull. - CORRECT ANSWER -false
Sling angle stress could contribute to an overload even if the slings selected had enough capacity to carry the total load weight. - CORRECT ANSWER -true
Which of the following attachment points can be used at full capacity when pulled at any angle from vertical? - CORRECT ANSWER -swivel hoist rings
- / 2
To find sling angle stress... - CORRECT ANSWER -multiply the weight in the attachment point with the angle factor
Who is required to perfom an inspection prior to using rigging gear, and what is this inspection called? - CORRECT ANSWER -the user, pre-use inspection
Detailed written procedures are required for every rigging operation. - CORRECT ANSWER-false
The rigging operating envelope contains the rigging gear and miscellaneous equipment covered by P-307 section 14, the load itself and... - CORRECT ANSWER -the load rigging path, the gear or equipment's supporting structure
When a load is left suspended unattended from a chain hoist it must be secured. How is the chain hoist secured - CORRECT ANSWER -the chain is tied off or pad locked
What is the efficiency of a knot or bend? - CORRECT ANSWER -75
Never bend a wire rope around a diameter _______ itself. - CORRECT ANSWER - smaller than
To whom or to what are the majority of crane and rigging accidents attributed? - CORRECT ANSWER -personnel error
What is the name of the knot or hitch shown below? (blue rope) - CORRECT ANSWER - clove hitch
a straight-line hitch is good for _____ of a sling rated load? - CORRECT ANSWER - 100%
What must be used to tighten a swivel hoist ring to the manufacturer's requirements? - CORRECT ANSWER -a torque wrench
Attachment point #1 is 6 feet from the center of gravity (CG) and attachment point #2 is
- feet from the center of gravity (CG). There is a 10,000 lbs load attached. What is the
correct equation to find the weight distribution for attachment point #1? - CORRECT ANSWER-3 divided by 9 multiplied by 10,000 (3 / 9 x 10,000)
It is ok to tie a know in or install a bolt into a chain sling leg to shorten the sling. - CORRECT ANSWER -false
When rigging gear covered by p-307 section 14 fails while suspended from a structure
and drops the load it is a: - CORRECT ANSWER -rigging accident
Why must hoisting be stopped once the load is completely off the ground? - CORRECT ANSWER-to determine sling angle stress
- / 2