Crane Stability and Load Handling, Exams of Advanced Education

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NCCCO Core Questions 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 A durable rating chart with legible letters and figures shall be provided with each crane accessible to: - Answer- The operator at the controls The lifting capacities listed in the load chart assume that: - Answer- The lift is to be performed under ideal conditions A "rough terrain" crane set up on outriggers that is based on 85% tipping should have the tires: - Answer- Off the supporting surface Load charts are based on stationary loads, which are also known as: - Answer- Static loads The capacity in a mobile crane's load chart are based on either structural limits or - Answer- Stability The values listed in the manufacture's load chart show: - Answer- Rated capacities Net capacity is: - Answer- Manufactures load ratings minus capacity deductions 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 The boom angle indicator indicates the booms angle to the: - Answer- Horizontal 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 Ona telescopic boom truck with outriggers properly positioned, the working area chart will indicate "over front" area is: - Answer- Determined by the crane manufacturer When the load radius falls between capacities listed in the load chart use the gross capacity for the - Answer- Longer radius 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 How does the operator verify that the operators aid readings for boom length, load radius, or boom angle are accurate? - Answer- Actual measurements When is it permitted to bypass the Load Moment indicator LMI? - Answer- During assembly and disassembly Rigging components, blocks, hooks, and other lifting equipment on a crane is considered part of the: - Answer- Gross load All telescopic boom cranes are to be equipped with a load chart, a boom length indicator and: - Answer- A boom angle indicator Who is to give the operator hand signals? - Answer- The person(s) assigned prior to the lift When leaving telescopic boom cranes unattended overnight or for longer periods, the boom should - Answer- Be fully retracted and stowed OSHA 1926 Subpart CC, requires hoist drum rotation indicator to be installed on cranes manufactured after November 8,2011 - Answer- When the hoist drum is not visible to the operator A drum rotation indicator on a crane will tell the operator: - Answer- Direction and speed of the hoist drum What is the purpose of an anti-two block device? - Answer- To prevent the block or ball from contacting the boom tip What is the difference between an anti-two block warning device and an anti-two block prevention system? - Answer- Warning device only warns, but prevention system will stop the operation All of the following can cause a two-block condition EXCEPT - Answer- Raising the boom According to OSHA 1926 Subpart CC, if the anti-two block device is not in proper working order on a telescopic boom crane, what alternative measure(s) are required to continue working? - Answer- Clearly mark the cable and use a spotter when extending the boom According to ASME B30.5, which of the following is required for a boom length indicator? - Answer- It must be readable from the operators station Which of the following is a temporary alternative measure when a boom length indicator malfunctions? - Answer- Mark the boom with measured marks to calculate boom length According to ASME 830.5, what option provides guidance for an operator when a radius indicator becomes inoperative? - Answer- Must measure radius An audible outrigger/stabilizer alarm indicates - Answer- The outriggers/stabilizers are in motion What function does the holding valve on a vertical outrigger jack perform? - Answer- Hold pressure in the vertical ram if a hydraulic connection fails How many strands are there in a 1/2 in. 6x37 wire rope? - Answer- 6 When operating a truck crane which of the following is the least stable allowable quadrant of operation? - Answer- Side Cranes with suspended loads generate the highest ground pressure when working in which area? - Answer- Corner The most common killer of ground personnel working around cranes is: - Answer- Energized power line contact It must be assumed that power lines are: - Answer- Energized According to OSHA 1926 Subpart CC, warnings for power lines must be: - Answer- Visible in operator's cab and on outside of crane As the power line voltages intensify the minimum clearances: - Answer- Increase In order for an overhead power line to be considered de-energized it must be verify by the - Answer- Line owner According to OSHA 1926 Subpart CC, if any part of the equipment will get closer than 20 feet to the power line what is required? - Answer- Dedicated spotter If an operator must leave the crane that is in contact with energized power lines and important precaution would be to: - Answer- Avoid simultaneous contact with the crane and the ground ANSI/ASME B 30.5 requires a signal to observe power lines clearances and to be in constant communication with the operator when the crane is within: - Answer- A boom's length of the limit of approach 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%