NCCCO CORE Questions | 100% Correct
Answers | Verified | Latest 2024 Version
Before leveling a mobile crane on outriggers, an operator should ensure: - ✔✔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? - ✔✔Keeping 90 degree angle between cylinder rod and pad
What is the primary purpose fir a rooster sheave or auxiliary boom point sheave? - ✔✔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? - ✔✔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? - ✔✔1
Type 1 rotation resistant hoist wire rope has a design factor of: - ✔✔5 to 1
How many randomly distributed broken wires in rotation- resistant hoist wire rope are considered for
replacement? - ✔✔2 broken wires in 6 rope diameters
The term net capacity is best defined by which of the terms listed below? - ✔✔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? - ✔✔Manufacturer
When lifting loads on tires, mobile cranes are rated at what percentage of tipping? - ✔✔75%
, How does the effective weight of a slowed extension relate to the actual weight of the extension? -
✔✔Higher than the actual weight.
When load radius is between radii values, the operator must use the: - ✔✔longer radius
Why should only approved attachments or extra counterweights provided by the manufacturer be
placed on the rear of the crane? - ✔✔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: - ✔✔increases
Abruptly stopping a rapid swing on a long-boom mobile crane will produce what major effect? -
✔✔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: - ✔✔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? - ✔✔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? - ✔✔Decreases stability.
Backward stability of a mobile crane is tested in which configuration listed below? - ✔✔Basic boom at
minimum angle with no load
Deflection of the boom while operating a mobile crane will increase? - ✔✔Load Radius (Swings out)
A sudden start or stop of the hoisting function while operating a mobile crane can produce a: -
✔✔dynamic load
Before lifting an occupied personnel platform on a job site, which of the following applies? - ✔✔Use 50%
of rated capacity, Trial lift to anticipated weight, Ensure rigging dedicated to platform only.
Answers | Verified | Latest 2024 Version
Before leveling a mobile crane on outriggers, an operator should ensure: - ✔✔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? - ✔✔Keeping 90 degree angle between cylinder rod and pad
What is the primary purpose fir a rooster sheave or auxiliary boom point sheave? - ✔✔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? - ✔✔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? - ✔✔1
Type 1 rotation resistant hoist wire rope has a design factor of: - ✔✔5 to 1
How many randomly distributed broken wires in rotation- resistant hoist wire rope are considered for
replacement? - ✔✔2 broken wires in 6 rope diameters
The term net capacity is best defined by which of the terms listed below? - ✔✔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? - ✔✔Manufacturer
When lifting loads on tires, mobile cranes are rated at what percentage of tipping? - ✔✔75%
, How does the effective weight of a slowed extension relate to the actual weight of the extension? -
✔✔Higher than the actual weight.
When load radius is between radii values, the operator must use the: - ✔✔longer radius
Why should only approved attachments or extra counterweights provided by the manufacturer be
placed on the rear of the crane? - ✔✔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: - ✔✔increases
Abruptly stopping a rapid swing on a long-boom mobile crane will produce what major effect? -
✔✔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: - ✔✔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? - ✔✔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? - ✔✔Decreases stability.
Backward stability of a mobile crane is tested in which configuration listed below? - ✔✔Basic boom at
minimum angle with no load
Deflection of the boom while operating a mobile crane will increase? - ✔✔Load Radius (Swings out)
A sudden start or stop of the hoisting function while operating a mobile crane can produce a: -
✔✔dynamic load
Before lifting an occupied personnel platform on a job site, which of the following applies? - ✔✔Use 50%
of rated capacity, Trial lift to anticipated weight, Ensure rigging dedicated to platform only.
