Before leveling a mobile crane on outriggers, an operator should ensure: - ANSWER there is

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 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.

NCCCO CORE FINAL EXAM QUESTIONS AND

ANSWERS LATEST UPDATE / (100%

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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.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? - 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? - ANSWER Decreases stability.Backward stability of a mobile crane is tested in which configuration listed below? - ANSWER Basic boom at minimum angle with no load Deflection of the boom while operating a mobile crane will increase? - ANSWER Load Radius (Swings out) A sudden start or stop of the hoisting function while operating a mobile crane can produce a: - ANSWER dynamic load Before lifting an occupied personnel platform on a job site, which of the following applies? - ANSWER Use 50% of rated capacity, Trial lift to anticipated weight, Ensure rigging dedicated to platform only.According to OSHA 1926. 1431, while hoisting a personnel platform, what weather condition listed below will promptly discontinue the operation? - ANSWER Dangerous If working near overhead power line and using a tag line, which type of rope is least conductive to electricity? - ANSWER Polypropylene When working near power lines with the mobile crane, where does OSHA require caution stickers be installed on all equipment? - ANSWER At operators station and 2 on the outside of the equipment.According to OSHA table T, what is the minimum clearance for 133kV power lines? - ANSWER 10ft According to OSHA's table T, what clearance should a mobile crane IN TRANSIT keep while going under 445kV lines? - ANSWER 16ft

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