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Rigging practicesA load chart range diagram can best be used to help identify: - ANSnet capacity
for mobile crane working at maximum radius, exceeding what percentage of the cranes capacity
requires the radius to be verified? - ANS80%
the minimum depth of thread engagement for a 1/2 in eyebolt into steel object is? - ANS3/4 in
when tying knots in synthetic rope lashing, the rated load is increased by 50% ? - ANSfalse
the size of shackle that can be used in the eye of a wire rope sling must be ________ the wire
rope size? - ANSequal to or greater than
a shackle must be marked with the rated load, re-inspected due date, and the date
manufacture? - ANSfalse
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? - ANSdesignated
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 ? - ANS(50%)
a manufacturer's certificate of proof test may satisfy the initial test requirements for rigging
equipment? - ANSfalse
which of the following operator actions will most likely cause a reduction in the capacity of a
mobile crane? - ANSbooming down
an angular pull of 45 degrees is allowed on non shouldered type eye bolts? - ANSfalse
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. - ANSfalse
when are loads allowed to be moved over personnel? - ANSnever
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) - ANS1800 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: - ANSover rigging the load
a straight-line hitch is good for _____ of a sling rated load? - ANS100%
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 -
ANS2000 lbs
why must hoisting be stopped once the load is completely off the ground? - ANSto determine
sling angle stress
the minimum crane team consist of ? - ANSthe crane operator and rigger-in-charge
while traveling a crane with a load, loads should be kept? - ANSas low as possible
attachment points must be visually inspected? - ANSbefore and after each use
when rigging your own loads, you are responsible for? - ANSall of the above
rigging gear test and inspection records must include: - ANSall of the information listed above
the crane operator is responsible for the safe _____ of the crane - ANSoperation
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? - ANSnotify 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? - ANS20ft
according to the NAVFAC P-307, what are the two types of crane lifts ? - ANScomplex 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. - ANS2
the volume of the cylinder is ______ cubic feet - ANS9.42
calculate the tension in leg A - ANS1607
increasing the sling angle from horizontal _______ the stress in the sling? - ANSdecreases
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