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 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 3.5 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 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 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