Before leveling a mobile crane on outriggers, an operator should ensure: - answer-there is no weight of the crane bearing on any tires
Operating a mobile crane with a long boom, on uneven ground, what support condition should be considered? - answer-Keeping 90 degree angle between cylinder rod a...
NCCCO CORE EXAM
Before leveling a mobile crane on outriggers, an operator should ensure: - answer-there is no weight of
the crane bearing on any tires
Operating a mobile crane with a long boom, on uneven ground, what support condition should be
considered? - answer-Keeping 90 degree angle between cylinder rod and pad
What is the primary purpose fir a rooster sheave or auxiliary boom point sheave? - answer-Separate the
boom hoist lines
How many randomly broken wires in a lay length must there be on a mobile cranes hoist line, before it
should be removed from service? - answer-6
On a mobile crane, how many broken wires are permitted at the end connection of a pendent before it
must be taken out of service? - answer-1
Type 1 rotation resistant hoist wire rope has a design factor of: - answer-5 to 1
How many randomly distributed broken wires in rotation- resistant hoist wire rope are considered for
replacement? - answer-2 broken wires in 6 rope diameters
The term net capacity is best defined by which of the terms listed below? - answer-Gross capacity minus
capacity deductions
Mobile cranes that are set up on barges, shall have a list chart provided by which of the entities listed
below? - answer-Manufacturer
When lifting loads on tires, mobile cranes are rated at what percentage of tipping? - answer-75%
How does the effective weight of a slowed extension relate to the actual weight of the extension? -
answer-Higher than the actual weight.
When load radius is between radii values, the operator must use the: - answer-longer radius
Why should only approved attachments or extra counterweights provided by the manufacturer be
placed on the rear of the crane? - answer-They could cause a backward stability problem.
A mobile crane's jib is offset 15º versus its original 0º offset, but the boom angle remains unchanged. In
this situation, the load radius: - answer-increases
Abruptly stopping a rapid swing on a long-boom mobile crane will produce what major effect? - answer-
Collapsing the boom.
When determining the position to a mobile crane should be left in over night, when high winds in the
forecast the operator should: - answer-Follow the manufacturers recommendations.
, If a mobile crane is NOT set-up level and the operator swings the load from the high side to the low side,
what effect will that have on the radius? - answer-The radius increase.
Increasing the distance from the crane's center of gravity to the tipping axis will have what effect on the
mobile crane? - answer-Decreases stability.
Backward stability of a mobile crane is tested in which configuration listed below? - answer-Basic boom
at minimum angle with no load
Deflection of the boom while operating a mobile crane will increase? - answer-Load Radius (Swings out)
A sudden start or stop of the hoisting function while operating a mobile crane can produce a: - answer-
dynamic load
Before lifting an occupied personnel platform on a job site, which of the following applies? - answer-Use
50% of rated capacity, Trial lift to anticipated weight, Ensure rigging dedicated to platform only.
According to OSHA 1926. 1431, while hoisting a personnel platform, what weather condition listed
below will promptly discontinue the operation? - answer-Dangerous
If working near overhead power line and using a tag line, which type of rope is least conductive to
electricity? - answer-Polypropylene
When working near power lines with the mobile crane, where does OSHA require caution stickers be
installed on all equipment? - answer-At operators station and 2 on the outside of the equipment.
According to OSHA table T, what is the minimum clearance for 133kV power lines? - answer-10ft
According to OSHA's table T, what clearance should a mobile crane IN TRANSIT keep while going under
445kV lines? - answer-16ft
According to OSHA when is it safe to hoist loads with a mobile crane below energized power lines? -
answer-When the fully extended boom can't reach the prohibited zone.
According to OSHA 1926. 1411, when you encounter power lines with a voltage of 44kV and the crane is
TRAVELING, according to Table T, what is the minimum required clearance? - answer-6ft
According to OSHA, mobile crane load block hooks must not have a twist in excess of: - answer-0
According to OSHA, mobile crane load blocks hooks must not have a throat opening in excess of: -
answer-5%
When correctly installing U-bolt type wire rope clips, the U portion of the clip shall be on: - answer-the
dead or short end
What is the angle between the top of the load and the sling leg referred to in sling load charts? - answer-
Horizontal sling angle
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