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NCCCO CORE EXAM
QUESTIONS AND ANSWERS
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 1 / 2
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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.
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