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NCCCO CORE ( / ) QUESTIONS
WITH
Before leveling a mobile crane on outriggers, an operator should ensure: - CORRECT 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? - CORRECT ANSWER -Keeping 90 degree angle between cylinder rod and pad
What is the primary purpose fir a rooster sheave or auxiliary boom point sheave? - CORRECT 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? - CORRECT 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? - CORRECT ANSWER -1
Type 1 rotation resistant hoist wire rope has a design factor of: - CORRECT ANSWER -5 to 1
How many randomly distributed broken wires in rotation- resistant hoist wire rope are considered for replacement? - CORRECT ANSWER -2 broken wires in 6 rope diameters
The term net capacity is best defined by which of the terms listed below? - CORRECT 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? - CORRECT ANSWER -Manufacturer 1 / 2
When lifting loads on tires, mobile cranes are at what percentage of tipping? - CORRECT
ANSWER -75%
How does the effective weight of a slowed extension relate to the weight of the extension? - CORRECT ANSWER -Higher than the weight.
When load radius is between radii values, the operator must use the: - CORRECT ANSWER - longer radius
Why should only approved attachments or extra counterweights provided by the manufacturer be placed on the rear of the crane? - CORRECT 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: - CORRECT ANSWER -increases
Abruptly stopping a rapid swing on a long-boom mobile crane will produce what major effect? - CORRECT 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: - CORRECT 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? - CORRECT 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? - CORRECT ANSWER -Decreases stability.
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