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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
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 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 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 According to ANSI B30.5, the minimum distance the flange of the drum shall extend over the top layer of wire rope is: - Answer- 1/2 in.
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
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 When assembling or disassembling a crane boom, which type of rigging should be used? - Answer- Synthetic slings When personnel are engaged in hooking, when unhooking or guiding a load in the fall zone they must: - Answer- Wear steel toe boots Latch equipment hooks must be used unless: - Answer- The application makes use of the latch impractical or unsafe Which type of hook is NOT permitted when people are in the fall zone? - Answer- Sorting hook What should be used as a softener to protect slings from sharp corners? - Answer- Split pipe sections Rotation resistant wire rope must be inspected more frequently because: - Answer- Internal damage will occur more frequently Excessive side loading can occur when: - Answer- Dragging a load
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
. The ground pressure exerted by a crane to the ground can approach a weight that can be equal to: - Answer- The weight of the crane and the suspended load When working Over water using a man basket, what is required? - Answer- Coast Guard approved vest, no harness According to OSHA 1926. 1413, running ropes are required to be inspected: - Answer- Prior to each shift According to ANSI B 30.5, the MINIMUM distance the flange of the drum shall extend over the top layer or while hoisting a personnel platform? - Answer- 1/2 inch Under which conditions can the crane operator leave the crane controls with a suspended load or while hoisting a personnel platform? - Answer- None
