Rigging practices course Questions and Answers 2023 with
complete solution
A load chart range diagram can best be used to help identify:
net capacity
for mobile crane working at maximum radius, exceeding what percentage of the cranes
capacity requires the radius to be verified?
80%
the minimum depth of thread engagement for a 1/2 in eyebolt into steel object is?
3/4 in
when tying knots in synthetic rope lashing, the rated load is increased by 50% ?
false
the size of shackle that can be used in the eye of a wire rope sling must be ________
the wire rope size?
equal to or greater than
a shackle must be marked with the rated load, re-inspected due date, and the date
manufacture?
false
when working near energized power lines where the crane or load could cross the
absolute limit of approach, what additional requirements must the crane team follow?
designated spotter must be stationed to watch clearances
the load weight of a personnel lift must not exceed _____ of the hoists rated capacity for
the working radius ?
(50%)
a manufacturer's certificate of proof test may satisfy the initial test requirements for
rigging equipment?
false
which of the following operator actions will most likely cause a reduction in the capacity
of a mobile crane?
booming down
an angular pull of 45 degrees is allowed on non shouldered type eye bolts?
false
two slings creating a 60 degree sling angle are used to lift a 4,000 pound item. the
appropriate rated load for each sling is 2,000 pounds.
false
when are loads allowed to be moved over personnel?
never
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)
1800 lbs
a crane accident occurs when any one of the elements in the crane operating envelope
fails to perform correctly during crane operations, maintenance, or testing, which results
in any of the following except:
over rigging the load
a straight-line hitch is good for _____ of a sling rated load?
, 100%
there are three slings hanging from a hook. each sling has a rated capacity of 2,000 lbs.
what is the heaviest load that could be lifted using these slings if they were attached to
a single point
2000 lbs
why must hoisting be stopped once the load is completely off the ground?
to determine sling angle stress
the minimum crane team consist of ?
the crane operator and rigger-in-charge
while traveling a crane with a load, loads should be kept?
as low as possible
attachment points must be visually inspected?
before and after each use
when rigging your own loads, you are responsible for?
all of the above
rigging gear test and inspection records must include:
all of the information listed above
the crane operator is responsible for the safe _____ of the crane
operation
if a crane team member sees an obstruction in the crane operating envelope that could
pose a threat to the crane operations, what course of action is the best to take?
notify the operator and work cautiously near the obstruction
what is the minimum distance any part of the crane or load may approach an energized
power line under 50,000 volts during a proposed operation?
20ft
according to the NAVFAC P-307, what are the two types of crane lifts ?
complex and non complex
when making a four-point lift using slings, they should normally be chosen such that
_____ legs have/has the capacity to support the entire load weight including the
additional stress due to lifting angle.
2
the volume of the cylinder is ______ cubic feet
9.42
calculate the tension in leg A
1607
increasing the sling angle from horizontal _______ the stress in the sling?
decreases
weight distribution at the attachment points is determined by measuring the...
distance they are from the CG
to whom or what are the majority of crane accidents attributed?
personnel error
a box has 27 cubic ft of sand in it. sand weighs 105 lbs per cubic ft. the box weighs
1,200 lbs empty. the correct equation to find the total weight is?
27x105=2,835+1,200= 4,035 lbs
according to the NAVFAC P-307, which of the following is a primary responsibility of the
rigger in charge
complete solution
A load chart range diagram can best be used to help identify:
net capacity
for mobile crane working at maximum radius, exceeding what percentage of the cranes
capacity requires the radius to be verified?
80%
the minimum depth of thread engagement for a 1/2 in eyebolt into steel object is?
3/4 in
when tying knots in synthetic rope lashing, the rated load is increased by 50% ?
false
the size of shackle that can be used in the eye of a wire rope sling must be ________
the wire rope size?
equal to or greater than
a shackle must be marked with the rated load, re-inspected due date, and the date
manufacture?
false
when working near energized power lines where the crane or load could cross the
absolute limit of approach, what additional requirements must the crane team follow?
designated spotter must be stationed to watch clearances
the load weight of a personnel lift must not exceed _____ of the hoists rated capacity for
the working radius ?
(50%)
a manufacturer's certificate of proof test may satisfy the initial test requirements for
rigging equipment?
false
which of the following operator actions will most likely cause a reduction in the capacity
of a mobile crane?
booming down
an angular pull of 45 degrees is allowed on non shouldered type eye bolts?
false
two slings creating a 60 degree sling angle are used to lift a 4,000 pound item. the
appropriate rated load for each sling is 2,000 pounds.
false
when are loads allowed to be moved over personnel?
never
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)
1800 lbs
a crane accident occurs when any one of the elements in the crane operating envelope
fails to perform correctly during crane operations, maintenance, or testing, which results
in any of the following except:
over rigging the load
a straight-line hitch is good for _____ of a sling rated load?
, 100%
there are three slings hanging from a hook. each sling has a rated capacity of 2,000 lbs.
what is the heaviest load that could be lifted using these slings if they were attached to
a single point
2000 lbs
why must hoisting be stopped once the load is completely off the ground?
to determine sling angle stress
the minimum crane team consist of ?
the crane operator and rigger-in-charge
while traveling a crane with a load, loads should be kept?
as low as possible
attachment points must be visually inspected?
before and after each use
when rigging your own loads, you are responsible for?
all of the above
rigging gear test and inspection records must include:
all of the information listed above
the crane operator is responsible for the safe _____ of the crane
operation
if a crane team member sees an obstruction in the crane operating envelope that could
pose a threat to the crane operations, what course of action is the best to take?
notify the operator and work cautiously near the obstruction
what is the minimum distance any part of the crane or load may approach an energized
power line under 50,000 volts during a proposed operation?
20ft
according to the NAVFAC P-307, what are the two types of crane lifts ?
complex and non complex
when making a four-point lift using slings, they should normally be chosen such that
_____ legs have/has the capacity to support the entire load weight including the
additional stress due to lifting angle.
2
the volume of the cylinder is ______ cubic feet
9.42
calculate the tension in leg A
1607
increasing the sling angle from horizontal _______ the stress in the sling?
decreases
weight distribution at the attachment points is determined by measuring the...
distance they are from the CG
to whom or what are the majority of crane accidents attributed?
personnel error
a box has 27 cubic ft of sand in it. sand weighs 105 lbs per cubic ft. the box weighs
1,200 lbs empty. the correct equation to find the total weight is?
27x105=2,835+1,200= 4,035 lbs
according to the NAVFAC P-307, which of the following is a primary responsibility of the
rigger in charge
