NCCCO Core Questions & correct answers(SCORED A+), Exams of Mobile Computing

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NCCCO Core Questions & correct answers(SCORED A+) The term "Superstructure or Upper works" refers to the area of the crane: - ANSWER Above the swing circle A crane must be level within _______% for the load chart ratings to be valid? - ANSWER 1% On what principle is crane stability based? - ANSWER Leverage What would be the effect of moving the tipping axis closer to the cranes center of gravity? - ANSWER Reduced stability Which of the following matches the appropriate load chart to a particular crane? - ANSWER Serial number When the boom angle falls between the capacities listed in the load chart use the gross capacity for the - ANSWER Lower boom angle When load charts are between the values listed in the load chart, the value that must be used is the: - ANSWER Lower at a longer radius A load moment indicator (LMI) is a computer installed on cranes designed to: provide the operator with information regarding the boom length, boom angle, boom tip height, working radius, rated load and a total calculated weight being lifted by the crane. The LMI also warns an operator when an overloading situation is about to occur. - ANSWER True . A crane operator plans to lift a gross load that weighs 26,300 Ibs. Based solely on the line pull of the crane base 6,000 Ibs. what are the minimum parts of line required to — make the lift? - ANSWER Five Backward stability on a truck mounted crane could be dangerous when the crane is working on rubber, boom angle, minimum boom length: - ANSWER Over the side at a minimum radius Hydraulic cranes shall be equipped with holding valves to prevent boom lowering in the event of - ANSWER Hydraulic Failure What is the sum of the following deductions? Block = 1,350 Ibs; Rigging = 55 Ibs; Lifting beams = 200Ibs; - ANSWER 1,605 lbs. What is the minimum number of wraps required by OSHA to remain on load hoist drums? - ANSWER 2 wraps Load radius is defined as: the horizontal distance from the centerline of rotation line with: - ANSWER The rated load suspended You are lifting a load directly under the hook. As you put tension on it, the load lifts away from crane. What caused the increased in load radius as should have been placed? - ANSWER Boom deflection A crane that is set up properly should have the tires off the supporting surface and should be: - ANSWER Sufficient to support the crane and the load When a boom extension considered to be inits stowed position, it is: - ANSWER Pinned to the boom base section Crawler cranes produce the least amount of ground pressure is over the: - ANSWER Side What is the best source of information for determining boom tip height? - ANSWER Working range diagram What is the purpose of a work area diagram (chart)? - ANSWER To identify operational quadrants What is the primary purpose of a power take off (PTO)? - ANSWER Provides power transfer to the hydraulic pump(s) Rapid hoist acceleration - ANSWER Produces hook loads higher than the actual load weight When is it permissible to leave a telescopic boom crane with the engine running? - ANSWER When operator can observe unauthorized entry The crane is performing a pick and carry operation. Some important factors that should be considered: the load being as low as possible, boom as short as possible, centered over the front quadrant - ANSWER Tire pressure When inspecting the boom on a telescopic boom crane which item should be inspected? - ANSWER Wear pads Hoist lines that are not in use hanging below the boom tip are usually considered a deduction. When would a hoist line not be considered a deduction? - ANSWER When it's on top of the boom When a crane operator leaves the crane, the operator must first: - ANSWER Land all suspended loads A load applied at an angle to the vertical plane of the boom describes: - ANSWER Side Loading When determining the "gross load" the best method is: - ANSWER Get an accurate load weight and add the rigging The weights of load handling devices, such as load blocks, spreader bars, and slings are considered: - ANSWER Part of the load Gross capacity is 10,300 Ibs total deductions are 7,622 lbs. What is the net capacity? - ANSWER 2,678 lbs. Boom length is measured from the: - ANSWER Center of the heel pin(s) to the center of the boom tip sheaves Load chart capacities distinguished in bold type, marked with an asterisk, in a shaded area or above a bold line of the capacity chart are based on: - ANSWER Structural strength The proper way to calibrate a boom angle indicator is: - ANSWER Boom up or down so the boom is horizontal and level than set the indicator at 0 degrees In what case is someone allowed to make modifications to the crane? - ANSWER When manufacture approves it in writing What is the acceptable maximum number of broken wires at an end connection before standing wire rope be replaced? - ANSWER 1 What affect does loosely spaced cribbing have on a crane and its float pads? - ANSWER Decreased stability and strength One purpose of a load moment indicator is to: - ANSWER Warn the operator of an overload condition What is the proper procedure when using an insulating link or a boot near power lines? - ANSWER Be sure to maintain the correct allowable distance from the lines When a crane is working near power lines and the rotation of the load could become dangerous, you should: - ANSWER Use a dry polypropylene rope for a tagline When operating a crane in the vicinity of energized power lines less than 350kV but the exact voltage is unknown, you must maintain a clearance of at least: - ANSWER 20 ft. What is the minimum allowable distance that a crane may operate near energized power lines up to 50kV? - ANSWER 10 ft. Dynamic motion such as swinging with the load can result in side loading of the boom and: - ANSWER A reduction in the duty cycle chart What is the MINIMUM sheave size required for lower load blocks? - ANSWER 16 times the nominal diameter of the rope used According to OSHA, when a crane is in transit, what is the minimum clearance for power lines less than 50kV? - ANSWER 6 ft A luffing jib requires - ANSWER A limiting device How is a rope lay measured? - ANSWER The length along the rope in which one strand makes one revolution around the core When is it permitted to side load a crane boom? - ANSWER Only with a freely suspended load What is the primary purpose for installing a fixed jib on a crane? - ANSWER To increase the total height Float pads must: - ANSWER Be latched to jack To calculate net capacity, if the rating in a load chart is greater than the line pull you should: - ANSWER Use the permissible line pull of the wire rope and then make deductions What percentage of a crane's capacity is considered to be a critical lift? - ANSWER 75% If an operator lifts with an offset jib, the crane's capacity - ANSWER Is reduced Load chart ratings apply when the load line is: - ANSWER Vertical When performing duty cycle work you shall reduce the crane's rated capacity by: - ANSWER Manufacture recommendations If a crane is working on tires it is based on what percentage of rated tipping capacity? - ANSWER 75% In a pick and carry operation, what is the rated tipping capacity of a crane based on? - ANSWER 75% If the rating on a chain or a sling is not visible: - ANSWER Do not use the sling What is an important consideration when lifting with a chain? - ANSWER The chain is marked with a rating The basket hitch requires: - ANSWER Both eyes of the sling in the hook By order of hitch strength from strongest to weakest which is the correct answer? - ANSWER Basket, vertical, choker When rigging a load that requires two slings, an important factor to remember is that: - ANSWER The lower the sling angle, the greater the tension Which of the following sling angles is the weakest? - ANSWER 30 degrees The D/d ratio is: - ANSWER The diameter of the load divided by the body diameter of the sling When using a two-legged bridle hitch, a sling angle of 30 degrees, in comparison to 60 degrees, results in: - ANSWER Increased sling tension Nylon slings should not come into contact with: - ANSWER Acids Excessive side loading can occur when: - ANSWER Dragging a load Who is permitted to give the crane operator the stop signal? - ANSWER Anyone According to ASME B 30.5, two audible signals mean: - ANSWER Go forward Which crane hand signal is illustrated: Use whip line - ANSWER An auxiliary boom head/point keeps the main and the whip line separated and is intended to be used with: - ANSWER An auxiliary hoist Some very important factors that should be considered when performing multiple crane lifts are: having one lift director the cranes being level, not exceeding 75% of the rated capacity of each crane and: - ANSWER Cranes maintain a vertical hoist line When making a multiple crane lift is important for the operator to understand that the load increases at the suspended end and: - ANSWER If one crane lands the load the other crane may become overloaded Construction site hazards and restrictions are located and identified by: - ANSWER A pre-operational work site inspection Why do crane manufacturers reduce load capacities for duty cycle operations? - ANSWER Because the creation of side loading forces How often must rigging be inspected? - ANSWER Each shift, prior to use An operator must test the brakes - ANSWER Each time a load that is 90% or more of the maximum line is handled According to ASME B30.5, if the power to the crane fails during operation, what is the FIRST action that should be taken? - ANSWER Set all brakes and locking devices What may be required while traveling a crane without a load on a job site under or near power lines? - ANSWER a dedicated spotter According to OSHA 1926 Subpart CC, the MINIMUM distance that must be maintained between any part of a working crane or load and an 8kV power line is - ANSWER 10 ft According to OSHA 1926 Subpart CC, for cranes traveling with no load, what is the minimum clearance power lines of 40kV? - ANSWER 6 ft The only time a suspended personnel platform is permitted to be used is when: - ANSWER Other methods would be more hazardous When lifting personnel platform, a telescopic crane does not have to be equipped with: - ANSWER Counterweight When lifting personnel what type of hook latch must be used? - ANSWER One that can be closed and locked According to OSHA 1926 Subpart CC, which is required if a telescopic boom crane is to be used to hoist a personnel platform? - ANSWER A crane equipped with a boom angle indicator When hoisting personnel a telescopic crane must be equipped with anti-block prevention system, a boom angle indicator and: - ANSWER Boom length indicator When hoisting personnel with a telescopic boom crane, an anti-two block prevention system shall be provided. If the operator two-blocks the crane, the functions that will be disabled what are? - ANSWER Hoist up, extend out and lower boom When using a man basket, the wire rope slings and all the rigging must have a safety factor of - ANSWER 5 times the maximum intended load What percentage of your cranes capacity must your load be limited to when using suspended platforms? - ANSWER 50% OSHA requires a proof test of _______% of basket capacity at each new job site? - ANSWER 125% When testing a man basket, how long must the test lift be maintained? - ANSWER 5 minutes