NCCCO Core Questions and Answers for Mobile Crane Operators, Exams of Workplace Safety

Download NCCCO Core Questions and Answers for Mobile Crane Operators and more Exams Workplace Safety in PDF only on Docsity!

NCCCO CORE QUESTIONS AND ANSWERS

2024-2025 UPDATED GRADED A+.

Before leveling a mobile crane on outriggers, an operator should ensure: - Precise 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? - Precise answer Keeping 90 degree angle between cylinder rod and pad What is the primary purpose fir a rooster sheave or auxiliary boom point sheave? - Precise 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? - Precise 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? - Precise answer 1 Type 1 rotation resistant hoist wire rope has a design factor of: - Precise answer 5 to 1 How many randomly distributed broken wires in rotation- resistant hoist wire rope are considered for replacement? - Precise answer 2 broken wires in 6 rope diameters The term net capacity is best defined by which of the terms listed below? - Precise 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? - Precise answer Manufacturer When lifting loads on tires, mobile cranes are rated at what percentage of tipping? - Precise answer 75%

How does the effective weight of a slowed extension relate to the actual weight of the extension? - Precise answer Higher than the actual weight. When load radius is between radii values, the operator must use the: - Precise answer longer radius Why should only approved attachments or extra counterweights provided by the manufacturer be placed on the rear of the crane? - Precise 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: - Precise answer increases Abruptly stopping a rapid swing on a long-boom mobile crane will produce what major effect? - Precise 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: - Precise 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? - Precise 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? - Precise answer Decreases stability. Backward stability of a mobile crane is tested in which configuration listed below? - Precise answer Basic boom at minimum angle with no load Deflection of the boom while operating a mobile crane will increase? - Precise answer Load Radius (Swings out) A sudden start or stop of the hoisting function while operating a mobile crane can produce a: - Precise answer dynamic load

Before lifting an occupied personnel platform on a job site, which of the following applies? - Precise 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? - Precise answer Dangerous If working near overhead power line and using a tag line, which type of rope is least conductive to electricity? - Precise answer Polypropylene When working near power lines with the mobile crane, where does OSHA require caution stickers be installed on all equipment? - Precise 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? - Precise answer 10ft According to OSHA's table T, what clearance should a mobile crane IN TRANSIT keep while going under 445kV lines? - Precise answer 16ft According to OSHA when is it safe to hoist loads with a mobile crane below energized power lines? - Precise answer When the fully extended boom can't reach the prohibited zone. According to OSHA 1926. 1411, when you encounter power lines with a voltage of 44kV and the crane is TRAVELING, according to Table T, what is the minimum required clearance? - Precise answer 6ft According to OSHA, mobile crane load block hooks must not have a twist in excess of: - Precise answer 0 According to OSHA, mobile crane load blocks hooks must not have a throat opening in excess of: - Precise answer 5% When correctly installing U-bolt type wire rope clips, the U portion of the clip shall be on: - Precise answer the dead or short end What is the angle between the top of the load and the sling leg referred to in sling load charts? - Precise answer Horizontal sling angle

When installing a wedge socket, it must be attached with the load line pulling in a straight line from the: - Precise answer pin What is the purpose of placing mats or cribbing under outrigger floats? - Precise answer Distribute the force over a larger area Where is the best location for leveling a crane? - Precise answer Upperworks When may blocking (cribbing) be placed under outrigger beams on mobile cranes? - Precise answer Never approved Mobile cranes should be level to within what percent of grade? - Precise answer 1% Timber crane mats work best when they are - Precise answer Bolted together When arriving in the crane at the job site, the operator should first determine the condition of - Precise answer access roads What surface listed below would NOT be a good location for assembly or setup of a mobile crane? - Precise answer Above underground vaults Each outrigger pad and its blocking should be sufficient to support? - Precise answer The total weight of the crane and its load How does high wind affect a mobile crane with a long boom? - Precise answer Introduces side load onto the boom When is the only time the outrigger beams should be less than fully extended? - Precise answer The load chart indicates that this is allowed. Eccentric main boom tip reeving causing which of the following: - Precise answer Twisting of the main boom Which type of wire rope listed below is installed on most cranes? - Precise answer 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. - Precise answer 1/2 inch Which of the following is classified as a standing wire rope? - Precise answer Pendant line. When lifting on outriggers the floats or pads should always be: - Precise answer 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? - Precise answer 3. It is important to know when lubricating crane hoist wire rope, that the lubricant must: - Precise answer not hinder visual inspection How often is the competent person required to inspect the running wire ropes on a mobile crane? - Precise answer 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? - Precise answer 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? - Precise answer 2 On whose recommendations should a mobile crane preventative maintenance program be developed? - Precise answer 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: - Precise answer Center of rotation of the crane On a mobile crane, should the load be applied when determining the proper boom angle? - Precise answer Yes On a mobile cranes range digram, boom length and boom angle can be used to determine? - Precise answer Load radius

On a mobile crane, what is the weight of the slowed jib that is deducted in load chart calculations called? - Precise answer Effective weight When determining boom tip elevation for a mobile crane, the user could: use the range diagram - Precise answer use the range diagram When lifting off the main boom, how is the effective weight of the flyjib different in the erected position from that of the stowed position? - Precise answer Effective weight increasses Why do most crane manufacturers reduce load capacity for duty-cycle operations? - Precise answer Side loading forces may occur What is the difference between anti-two-block warning device and an anti- two-block prevention device? - Precise answer Warning device only warns, but prevention devices will stop the functions How can the LMI's boom length or load radius reading be verified? - Precise answer Actual measurements On mobile cranes, what does the boom angle indicator show the operator?

• Precise answer Angle of boom to horizontal What is the device called that automatically stops the boom when it nears the cranes maximum angle? - Precise answer Boom hoist limiting When the number of layers of wire rope on a drum increases the: - Precise answer Allowable line pull decreases On a mobile crane, side loading of the boom could be caused by which of the following? - Precise answer Starting or stopping the swing too rapidly Which person listed below, has the responsibility for determining the correct weight of a load? - Precise answer Lift Director What must an operator do when an operator leaves the controls of the crane from an extended period of time? - Precise answer Apply all brakes and dogs, and lower the load to the ground

When should a tag line be used, during the hoisting of material? - Precise answer 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? - Precise answer 75% When lifting a load with two mobile cranes, it is very important to: - Precise answer 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: - Precise answer 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: - Precise answer 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? - Precise answer 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? - Precise answer A floatation device What is the minimum pitch diameter used for sheaves in a boom hoist reeving system using rotation resistant wire rope? - Precise answer Not less than 18 times rope diameter When can capacity altering modifications be made to mobile cranes? - Precise answer 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: - Precise answer 100% of the load's leverage on the crane Who must determine maximum speed for a mobile crane to travel with a suspended load? - Precise answer The competent person

When traveling with a suspended load on a mobile crane climbing an incline, the load should be carried in which direction? - Precise answer Uphill Which mobile crane boom configuration can cause the most hazardous side-loading condition for the crane? - Precise answer Long boom with minimum radius When preparing to hoist a load, the load block hook should be positioned: - Precise answer Directly above the load's center of gravity When making a lift on outriggers, the maximum ground-bearing pressure occurs in which boom position? - Precise answer Over the corner When personnel platforms are hoisted with a mobile crane what item listed below must be provided? - Precise answer 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? - Precise answer 50% When proof testing a personnel platform to 125% of its rated capacity, how long must the platform be suspended? - Precise answer 5 minutes Which of the following correctly states the requirements for hooks used to hoist employees on a crane- supported personnel platform? - Precise answer Hooks shall have a latch that closes and locks OSHA permits hoisting of personnel by a crane as long as the employer can show: - Precise answer 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? - Precise answer 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? - Precise answer OSHA 1926. 1431

According to OSHA 1926.1431, which device listed below must be attached to the crane? - Precise answer Anti-two-block According to OSHA 1926.1431, which of these hoist options is prohibited? - Precise answer Hoist free fall Inside the personnel platform except for gates, how much of the perimeter must contain a grab rail for the occupants? - Precise answer 100% According to OSHA 1926. 1431, during personnel platform hoisting operations access gates NOT swing in which direction? - Precise answer Outward OSHA 1926. 1431 states that tag lines must be used: - Precise answer When necessary to control platform While hoisting in a personnel platform, direct communication must be maintained between the signal person and who? - Precise answer Operator, Rigger According to OSHA 1926, 1431, at wind speed must a qualified person be consulted? - Precise answer 20 mph According to OSHA, when working near power lines when is a dedicated spotter required? - Precise answer When crane operator is unable to see the warning line of signs According to OSHA 1926 1408, when operating near high voltage power lines, what clearance shall be required when the rating of the lines is 275kV? - Precise answer 20 feet w/encroachment precautions According to OSHA 1926. 1408, the minimum clearance between any part of the crane and power lines rated 50kV or below shall be: - Precise answer 10 feet w/encroachment precautions According to OSHA 1926 1408, for power lines rated 100kV the minimum clearance between the crane and any lines shall be? - Precise answer 15 feet w/encroachment precautions

The term "jib offset" can be expressed as the jib angle to which mobile crane component listed below? - Precise answer Boom On a mobile crane the term "part's of line" refers to which item listed below? - Precise answer The number of lines running thru the load block and boom point sheaves What is the design factor for grade 80 chain slings? - Precise answer 4 What grade alby steel chain should be used for hoisting slings? - Precise answer 80 Loads rigged using a basket hitch should be ____ to prevent slippage. - Precise answer Balanced When slings encounter sharp edges on loads to be lifted, riggers shall ensure that slings are: - Precise answer Protected or padded According to OSHA, quadruple sling bridle ratings are the same as - Precise answer triple sling bridle ratings Which statement listed below is correct about basic load rigging? - Precise answer As horizontal load angle decreases, stress increases The approximate percentage of strength of choker, vertical, and basket hitches respectively are: - Precise answer 75%, 100%, 200% According to ASME which of the following listed below shall NOT be used for the suspension system on suspended personnel platforms? - Precise answer Synthetic web bridle When rigging a bundle of pipe or tubing, which of the following would provide the best contact between sling and load? - Precise answer Double wrap choker For any signal other than emergency stop, who is permitted to give hand signals to the crane operator during a lift - Precise answer A qualified signal person Move slowly hand signal - Precise answer

Use whipline hand signal - Precise answer What is the first element of voice signals given to a crane operator prior to the lift? - Precise answer Function and direction According to OSHA, each series of voice signals contain how many elements? - Precise answer Three