Before leveling a mobile crane on outriggers, an operator should ensure: - ANSWERthere 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? - ANSWERKeeping 90 degree angle between cylinder rod and...
Before leveling a mobile crane on outriggers, an operator should ensure: - ANSWERthere 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? - ANSWERKeeping 90 degree angle between cylinder rod and pad
What is the primary purpose fir a rooster sheave or auxiliary boom point sheave? - ANSWERSeparate
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? - ANSWER6
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? - ANSWER1
Type 1 rotation resistant hoist wire rope has a design factor of: - ANSWER5 to 1
How many randomly distributed broken wires in rotation- resistant hoist wire rope are considered for
replacement? - ANSWER2 broken wires in 6 rope diameters
The term net capacity is best defined by which of the terms listed below? - ANSWERGross 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? - ANSWERManufacturer
When lifting loads on tires, mobile cranes are rated at what percentage of tipping? - ANSWER75%
, How does the effective weight of a slowed extension relate to the actual weight of the extension? -
ANSWERHigher than the actual weight.
When load radius is between radii values, the operator must use the: - ANSWERlonger radius
Why should only approved attachments or extra counterweights provided by the manufacturer be
placed on the rear of the crane? - ANSWERThey 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: - ANSWERincreases
Abruptly stopping a rapid swing on a long-boom mobile crane will produce what major effect? -
ANSWERCollapsing 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: - ANSWERFollow 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? - ANSWERThe radius increase.
Increasing the distance from the crane's center of gravity to the tipping axis will have what effect on
the mobile crane? - ANSWERDecreases stability.
Backward stability of a mobile crane is tested in which configuration listed below? - ANSWERBasic
boom at minimum angle with no load
Deflection of the boom while operating a mobile crane will increase? - ANSWERLoad Radius (Swings
out)
A sudden start or stop of the hoisting function while operating a mobile crane can produce a: -
ANSWERdynamic load
Before lifting an occupied personnel platform on a job site, which of the following applies? -
ANSWERUse 50% of rated capacity, Trial lift to anticipated weight, Ensure rigging dedicated to
platform only.
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