NCCER Turner Recertification TEST Exam Questions with Correct Answers
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Course
Nccer mobile crane
Institution
Nccer Mobile Crane
When the crane is over-the side, over-the-front, or over-the rear configurations, the center of gravity ids shifted either close or farther away from the? - Answer-Tipping axis (point)
When the crane is over-the side, over-the-front, or over-the rear configurations, the center of gravity its shi...
NCCER Turner Recertification TEST
Exam Questions with Correct Answers
When the crane is over-the side, over-the-front, or over-the rear configurations, the
center of gravity ids shifted either close or farther away from the? - Answer-Tipping axis
(point)
When the crane is over-the side, over-the-front, or over-the rear configurations, the
center of gravity its shifted either close or farther away from the tipping axis (point); this
in turn may? - Answer-Increase or decrease the crane's leverage
What is the crane weight x horizontal distance from the center of gravity of the crane to
the tipping axis? - Answer-Crane's leverage
A crane's leverages (crane weight x horizontal distance from the center of gravity of the
crane to the tipping axis) has to be greater than the? - Answer-Load's average (load
weight x horizontal distance from the center of gravity of the load to the tipping axis) to
make a lift
What is the load weight x horizontal distance from the center of gravity of the load to the
tipping axis? - Answer-Load's leverage
A crane's leverages (crane weight x horizontal distance from the center of gravity of the
crane to the tipping axis) has to be greater than the load's average (load weight x
horizontal distance from the center of gravity of the load to the tipping axis) to make a
lift. If it isn't then ___ occurs? - Answer-Tipping
The crane manufacturer designs a ___ chart for each model that is sold? - Answer-
Load/capacity
The load/capacity chart for each model crane may even be ___ specific? - Answer-
Serial-number
The load/capacity chart for each model crane may even be serial-number specific,
meaning a? - Answer-Different load/capacity chart is required for each crane, even if a
manufacturer only make one model
What will bear the model number and serial number or other identifier (the part number,
for ex) of the crane to which it applies? - Answer-Load/capacity chart
What cranes can be truck mounted or crawler mounted? - Answer-Lattice boom cranes
What cranes have hydraulic counterparts? - Answer-Lattice boom cranes
, Lattice boom cranes have hydraulic counterparts, and these cranes are capable of
much longer? - Answer-Boom lengths
A crane may be ___ before any signs of tipping are evident? - Answer-Overloaded
A crane an be ___ before tipping occurs? - Answer-Overstressed or can fail structurally
The capacities on a load/capacity chart are limited by either the? - Answer--structural
strength of the crane (as determined by ANSI/SAE J987 guidelines)
-stability (the crane's ability to resist tipping)
What is the crane's ability to resist tipping? - Answer-Stability
The load/capacity charts of mobile cranes are based on the configuration of the crane at
the time of the? - Answer-Lift
Capacities on-outriggers? - Answer-Do not exceed 85%
Capacities on rubber? - Answer-Do not exceed 75%
What is a side view of a crane with its full range of boom lengths, jibs, and boom
extensions? - Answer-Range diagram
A crane's leverage is determined by? - Answer-The crane weight times the horizontal
distance from the crane's center of gravity to the tipping axis
The least capacity of a typical truck-mounted crane w/o a forward outrigger occurs when
the tipping axis is? - Answer-Over the front of the crane
Rough-terrain cranes are designed to be? - Answer-Operated w/in 1% of level on a firm,
supporting surface
Site preparation and crane erection take the most time for ___ cranes? - Answer-Lattice
boom
Boom lengths does not include the length of the jib- true of false? - Answer-True
The maximum horizontal distance from a projection of the axis of rotation to the center
of the vertical hoist line or tackle w/ load applied for the given boom length, angle, and
operating quadrant is the? - Answer-Load operating radius
According to ASME B30.5, a load rating chart must include? - Answer-Work areas and
load rating where no loads are permitted to be handled
A crane can? - Answer-Be overloaded before any signs o tipping are evident
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