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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.
When installing a wedge socket, it must be attached with the load line pulling in a straight line from the:
- ✔✔pin What is the purpose of placing mats or cribbing under outrigger floats? - ✔✔Distribute the force over a larger area Where is the best location for leveling a crane? - ✔✔Upperworks When may blocking (cribbing) be placed under outrigger beams on mobile cranes? - ✔✔Never approved Mobile cranes should be level to within what percent of grade? - ✔✔1% Timber crane mats work best when they are - ✔✔Bolted together When arriving in the crane at the job site, the operator should first determine the condition of - ✔✔access roads What surface listed below would NOT be a good location for assembly or setup of a mobile crane? - ✔✔Above underground vaults Each outrigger pad and its blocking should be sufficient to support? - ✔✔The total weight of the crane and its load How does high wind affect a mobile crane with a long boom? - ✔✔Introduces side load onto the boom When is the only time the outrigger beams should be less than fully extended? - ✔✔The load chart indicates that this is allowed. Eccentric main boom tip reeving causing which of the following: - ✔✔Twisting of the main boom Which type of wire rope listed below is installed on most cranes? - ✔✔Right regular lay
The hoist drum flange shall extend a minimum of ________ over the top layer of wire rope at all times while crane is in operation. - ✔✔1/2 inch Which of the following is classified as a standing wire rope? - ✔✔Pendant line. When lifting on outriggers the floats or pads should always be: - ✔✔Raised to touch the tires firmly on the ground. What is the minimum design factor required for a regular lay, boom or hoist wire rope? - ✔✔3. It is important to know when lubricating crane hoist wire rope, that the lubricant must: - ✔✔not hinder visual inspection How often is the competent person required to inspect the running wire ropes on a mobile crane? - ✔✔Each shift On mobile cranes, how many broken wires must be present in one strand of one lay for running wire rope to be removed from service? - ✔✔ 3 According to OSHA, what is the minimum number of full wraps of wire rope that must remain on hoist drums in all service conditions? - ✔✔ 2 On whose recommendations should a mobile crane preventative maintenance program be developed? - ✔✔Crane manufacturer On a mobile crane, the measurement for the load radius in this distance from the center of gravity of the suspended load to the: - ✔✔Center of rotation of the crane On a mobile crane, should the load be applied when determining the proper boom angle? - ✔✔Yes On a mobile cranes range digram, boom length and boom angle can be used to determine? - ✔✔Load radius
When should a tag line be used, during the hoisting of material? - ✔✔When the rotation of the load would be dangerous What percentage of the rated capacity of a mobile crane must be used when lifting with two cranes attached to the same load? - ✔✔75% When lifting a load with two mobile cranes, it is very important to: - ✔✔Keep the hoist lines of both cranes vertical If lifting a load with two mobile cranes of different rated capacities, the crane with the larger rated capacity should: - ✔✔Be hooked at a distance closer to the loads center of gravity When performing a multiple crane lift is is important for the operator's of each crane to understand that:
- ✔✔The weight may increase if the other crane lands the load When lifting loads that are submerged under water with a mobile crane, what is one of the conditions that the operator should be familiar with? - ✔✔Load will increase when lifting the load out of the water When lifting over water with a personnel platform, what are the occupants of the platform required to wear? - ✔✔A floatation device What is the minimum pitch diameter used for sheaves in a boom hoist reeving system using rotation resistant wire rope? - ✔✔Not less than 18 times rope diameter When can capacity altering modifications be made to mobile cranes? - ✔✔When permission is given by the crane manufacturer A crane is at the point of instability when the crane's leverage on the load equals: - ✔✔100% of the load's leverage on the crane Who must determine maximum speed for a mobile crane to travel with a suspended load? - ✔✔The competent person
When traveling with a suspended load on a mobile crane climbing an incline, the load should be carried in which direction? - ✔✔Uphill Which mobile crane boom configuration can cause the most hazardous side-loading condition for the crane? - ✔✔Long boom with minimum radius When preparing to hoist a load, the load block hook should be positioned: - ✔✔Directly above the load's center of gravity When making a lift on outriggers, the maximum ground-bearing pressure occurs in which boom position? - ✔✔Over the corner When personnel platforms are hoisted with a mobile crane what item listed below must be provided? - ✔✔And anti two-block device Personnel platforms suspended on the hook of a mobile crane, must not exceed what percentage of a crane's capacity at any given radius? - ✔✔50% When proof testing a personnel platform to 125% of its rated capacity, how long must the platform be suspended? - ✔✔5 minutes Which of the following correctly states the requirements for hooks used to hoist employees on a crane- supported personnel platform? - ✔✔Hooks shall have a latch that closes and locks OSHA permits hoisting of personnel by a crane as long as the employer can show: - ✔✔There is no less hazardous or practical way Before lifting an occupied personnel platform on a job site the crew must ensure they perform which of the following? - ✔✔Must attend a pre- lift meeting Must fully deploy all outriggers Must preform a trial lift Which of the following standards or regulations governs the lifting of personnel in construction? - ✔✔OSHA 1926. 1431
On a mobile crane the term "part's of line" refers to which item listed below? - ✔✔The number of lines running thru the load block and boom point sheaves What is the design factor for grade 80 chain slings? - ✔✔ 4 What grade alby steel chain should be used for hoisting slings? - ✔✔ 80 Loads rigged using a basket hitch should be ____ to prevent slippage. - ✔✔Balanced When slings encounter sharp edges on loads to be lifted, riggers shall ensure that slings are: - ✔✔Protected or padded According to OSHA, quadruple sling bridle ratings are the same as - ✔✔triple sling bridle ratings Which statement listed below is correct about basic load rigging? - ✔✔As horizontal load angle decreases, stress increases The approximate percentage of strength of choker, vertical, and basket hitches respectively are: - ✔✔75%, 100%, 200% According to ASME which of the following listed below shall NOT be used for the suspension system on suspended personnel platforms? - ✔✔Synthetic web bridle When rigging a bundle of pipe or tubing, which of the following would provide the best contact between sling and load? - ✔✔Double wrap choker For any signal other than emergency stop, who is permitted to give hand signals to the crane operator during a lift - ✔✔A qualified signal person Move slowly hand signal - ✔✔
Use whipline hand signal - ✔✔ What is the first element of voice signals given to a crane operator prior to the lift? - ✔✔Function and direction According to OSHA, each series of voice signals contain how many elements? - ✔✔Three
