NCCCO Core Correct Questions & Answers (Rated A+), Exams of Mobile Computing

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NCCCO CORE CORRECT QUESTIONS & ANSWERS (RATED

A+)

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

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 According to OSHA when is it safe to hoist loads with a mobile crane below energized power lines? - 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? - ANSWER 6ft According to OSHA, mobile crane load block hooks must not have a twist in excess of: - ANSWER 0

According to OSHA, mobile crane load blocks hooks must not have a throat opening in excess of: - ANSWER 5% When correctly installing U-bolt type wire rope clips, the U portion of the clip shall be on: - ANSWER the dead or short end 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 What is the angle between the top of the load and the sling leg referred to in sling load charts? - ANSWER Horizontal sling angle When installing a wedge socket, it must be attached with the load line pulling in a straight line from the: - ANSWER pin What is the purpose of placing mats or cribbing under outrigger floats? - ANSWER Distribute the force over a larger area Where is the best location for leveling a crane? - ANSWER Upperworks When may blocking (cribbing) be placed under outrigger beams on mobile cranes? - ANSWER Never approved Mobile cranes should be level to within what percent of grade? - ANSWER 1%

Which type of wire rope listed below is installed on most cranes? - 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. - ANSWER 1/2 inch Which of the following is classified as a standing wire rope? - ANSWER Pendant line. When lifting on outriggers the floats or pads should always be: - 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? - ANSWER 3. It is important to know when lubricating crane hoist wire rope, that the lubricant must: - ANSWER not hinder visual inspection How often is the competent person required to inspect the running wire ropes on a mobile crane? - 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? - 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? - ANSWER 2 Timber crane mats work best when they are - ANSWER Bolted together When arriving in the crane at the job site, the operator should first determine the condition of - ANSWER access roads What surface listed below would NOT be a good location for assembly or setup of a mobile crane? - ANSWER Above underground vaults Each outrigger pad and its blocking should be sufficient to support? - ANSWER The total weight of the crane and its load How does high wind affect a mobile crane with a long boom? - ANSWER Introduces side load onto the boom

When is the only time the outrigger beams should be less than fully extended? - ANSWER The load chart indicates that this is allowed. Eccentric main boom tip reeving causing which of the following: - ANSWER Twisting of the main boom On whose recommendations should a mobile crane preventative maintenance program be developed? - 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: - ANSWER Center of rotation of the crane On a mobile crane, should the load be applied when determining the proper boom angle? - ANSWER Yes On a mobile cranes range digram, boom length and boom angle can be used to determine? - ANSWER Load radius On a mobile crane, what is the weight of the slowed jib that is deducted in load chart calculations called? - ANSWER Effective weight

When determining boom tip elevation for a mobile crane, the user could: use the range diagram - 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? - ANSWER Effective weight increasses Why do most crane manufacturers reduce load capacity for duty-cycle operations? - ANSWER Side loading forces may occur What is the difference between anti-two-block warning device and an anti-two-block prevention device? - 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? - ANSWER Actual measurements On mobile cranes, what does the boom angle indicator show the operator? - ANSWER Angle of boom to horizontal

What is the device called that automatically stops the boom when it nears the cranes maximum angle? - ANSWER Boom hoist limiting When the number of layers of wire rope on a drum increases the: - ANSWER Allowable line pull decreases On a mobile crane, side loading of the boom could be caused by which of the following? - ANSWER Starting or stopping the swing too rapidly 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.

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

Which person listed below, has the responsibility for determining the correct weight of a load? - ANSWER Lift Director A crane is at the point of instability when the crane's leverage on the load equals: - 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? - 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? - ANSWER Uphill Which mobile crane boom configuration can cause the most hazardous side-loading condition for the crane? - ANSWER Long boom with minimum radius When preparing to hoist a load, the load block hook should be positioned: - 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? - ANSWER Over the corner

When personnel platforms are hoisted with a mobile crane what item listed below must be provided? - 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? - ANSWER 50% When proof testing a personnel platform to 125% of its rated capacity, how long must the platform be suspended? - ANSWER 5 minutes Which of the following correctly states the requirements for hooks used to hoist employees on a crane- supported personnel platform? - 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: - 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? - 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? - ANSWER OSHA

1926. 1431 According to OSHA 1926.1431, which device listed below must be attached to the crane? - ANSWER Anti-two- block According to OSHA 1926.1431, which of these hoist options is prohibited? - ANSWER Hoist free fall Inside the personnel platform except for gates, how much of the perimeter must contain a grab rail for the occupants? - ANSWER 100% According to OSHA 1926. 1431, during personnel platform hoisting operations access gates NOT swing in which direction? - ANSWER Outward OSHA 1926. 1431 states that tag lines must be used: - ANSWER When necessary to control platform

While hoisting in a personnel platform, direct communication must be maintained between the signal person and who? - ANSWER Operator, Rigger According to OSHA 1926, 1431, at wind speed must a qualified person be consulted? - ANSWER 20 mph According to OSHA, when working near power lines when is a dedicated spotter required? - 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? - 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: - 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? - ANSWER 15 feet w/encroachment precautions The term "jib offset" can be expressed as the jib angle to which mobile crane component listed below? - ANSWER Boom

On a mobile crane the term "part's of line" refers to which item listed below? - ANSWER The number of lines running thru the load block and boom point sheaves What is the design factor for grade 80 chain slings? - ANSWER 4 What grade alby steel chain should be used for hoisting slings? - ANSWER 80 Loads rigged using a basket hitch should be ____ to prevent slippage. - ANSWER Balanced When slings encounter sharp edges on loads to be lifted, riggers shall ensure that slings are: - ANSWER Protected or padded According to OSHA, quadruple sling bridle ratings are the same as - ANSWER triple sling bridle ratings Which statement listed below is correct about basic load rigging? - ANSWER As horizontal load angle decreases, stress increases

The approximate percentage of strength of choker, vertical, and basket hitches respectively are: - 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? - 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? - 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

• ANSWER A qualified signal person Move slowly hand signal - ANSWER Use whipline hand signal - ANSWER What is the first element of voice signals given to a crane operator prior to the lift? - ANSWER Function and direction

What must an operator do when an operator leaves the controls of the crane from an extended period of time? - 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? - 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? - ANSWER 75% When lifting a load with two mobile cranes, it is very important to: - 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: - 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: - 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? - 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? - ANSWER A floatation device What is the minimum pitch diameter used for sheaves in a boom hoist reeving system using rotation resistant wire rope? - ANSWER Not less than 18 times rope diameter When can capacity altering modifications be made to mobile cranes? - ANSWER When permission is given by the crane manufacturer According to OSHA, each series of voice signals contain how many elements? - ANSWER Three