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Download NCCCO Core Exam Outline / Latest Questions And 100% Correct Answers Latest Updated 2025/20 and more Exams Building and Prefabrication in PDF only on Docsity!
What materials should be used when setting up on soft surfaces such as soft ground, asphalt or backfilled material - Correct Answer Timber or steel On crawler cranes, which boom position creates the greatest ground pressure - Correct Answer Over the corner What Allows the weight of the crane and load to be distributed over a greater surface area. Should be used under outrigger floats at all times. - Correct Answer Blocking Blocking should be at least how many times the surface area of the float - Correct Answer 3 Overhead power lines must be considered to be in this condition until electrical authorities indicate otherwise - Correct Answer Energized No part of the crane or load must ever enter this area around an energized power line - Correct Answer Prohibited zone The prohibited zone must be enlarged as this increases - Correct Answer kV What minimum distance does OSHA require be maintained when voltage up to 350 kV is unknown - Correct Answer 20 foot What minimum distance is required if the voltage is over 350 kV and unknown - Correct Answer 50 foot This person must be appointed any time the crane is working within a boom's length of the prohibited zone - Correct Answer Qualified signal person The use of these should be avoided when lifting near power lines, however if necessary should be non-conductive type - Correct Answer Tag lines Avoid operating cranes or handling materials in this area of power lines - Correct Answer Above power lines What does an operator do if the crane comes in contact with a power line - Correct Answer Remain in the cab If it is necessary to leave the crane cab before power lines are de-energized after contact, how does the operator exit the cab - Correct Answer Jump Responsible for seeing that the ground conditions are adequate to support the equipment. - Correct Answer Controlling entity Responsible for informing the user and the operator of the equipment of the location of hazards beneath the equipment set-up area (such as voids, tanks, utilities) - Correct Answer Controlling entity Responsible for establishing a system to coordinate the operations of two cranes that operate within each other's working radius - Correct Answer Controlling entity hoist rope & reeving, op aids & safety devices, cab windows/equipment, hooks & latches, fluid levels (crankcase oil, coolant, hydraulic oil, etc.), elec equipment, leveling device, control & drive mechanisms, fire extinguisher, air/hydraulic system - Correct Answer Key items of inspection firm & reasonably level surface, no buried pipes, utilities, sewers, tanks, etc. - Correct Answer Access to job site Important to accomplish when setting up a crane on a grade - Correct Answer Leveling the crane Load chart capacities are based on the crane being level within this percentage - Correct Answer 1% Use this tool placed under or close to the boom foot for an accurate measure of level - Correct Answer carpenter's level Swing the boom to this degree over the side and check for level again - Correct Answer 90 degrees the point where the entire weight of a body can be considered concentrated so that, if supported at this point, the body would remain in equilibrium in any position - Correct Answer Center of gravity use this tool to accurately verify the radius - Correct Answer tape measure the three basic components of wire rope - Correct Answer wires, strands, core the first number of wire rope classification that indicates how many of these which make up the rope - Correct Answer strands the second number of wire rope classification that indicates how many of these which make up a strand - Correct Answer wires this can occur if the boom is lowered with the block or ball is too close to the boom head or other hoisting points such as the boom extension or jib tip - Correct Answer two-blocking this device can stop an impending two-block condition and, if necessary, prevent further hoisting, boom extension and lowering of the boom - Correct Answer anti- two-block device occurs when the hook block or headache ball makes contact with sheaves at the main boom head, extension or jib tip. this can break the hoist rope and cause the hook block or ball to fall - Correct Answer two-blocking the number of hoist ropes which appear to directly support the lower load block or overhaul ball - Correct Answer parts of line weight of all devices used to lift the load combined with the actual load weight - Correct Answer suspended weight the suspended weight divided by the safe working load (SWL) of the hoist rope determines how many of these are required to hoist the load - Correct Answer minimum parts of line required this device measures the bearing force and moment in the crane arm during operations - Correct Answer load moment indicator a system which aids the equipment operator by sensing (directly or indirectly) the overturning moment on the equipment, i.e., load multiplied by radius. It compares this lifting condition to the equipment's rated capacity, and when the rated capacity is reached, it shuts off power to those equipment functions which can increase the severity of loading on the equipment - Correct Answer load moment limiter device which measures the angle of the boom relative to horizontal - Correct Answer boom angle indicator device on a crane or hoist which indicates in which direction and at what relative speed a particular hoist drum is turning - Correct Answer drum rotation indicator in this event, the operator should: try to lower the load to the ground, set all brakes and locking devices, and move clutches and other controls to the off or neutral position - Correct Answer power failure too much of this can affect the crane's backward stability and increase the likelihood of the boom collapsing back over the crane, particularly when traveling up an incline - Correct Answer counterweight This can cause the boom to be pulled backward over the crane, especially if the boom is operating at a high angle - Correct Answer two-blocking this can occur of the boom when tightening a load line that is connected back to the boom foot - Correct Answer backward collapse land any load, disengage master clutch, place all control levers in neural, set all brakes and locking devices, secure the crane against accidental travel, shut off the engine are to be completed when? - Correct Answer leaving crane unattended this is to be performed by a competent person each shift before the crane is used; also referred to as the pre-operational - Correct Answer shift inspection when lifting soft loads w/ a basket hitch, this should be used to prevent damage created from the pressure induced by sling angles. example: spreader beam - Correct Answer softeners wire rope wedge socket, wire rope clips, eye splices, - Correct Answer wire rope end terminations for the crane to remain stable the crane's leverage on the load must be greater than the load's leverage on the crane - Correct Answer principle of leverage the movement of the crane's this, increases the load's leverage on the crane and results in the crane's capacity being lowered - Correct Answer center of gravity most of these type of cranes have their greatest capacity over the rear - Correct Answer carrier mounted the crane's ability to resist tipping forward - Correct Answer forward stability the crane's ability to resist overturning backwards while in an unloaded condition - Correct Answer backward stability tipping or overturning and structural failure are caused by - Correct Answer overloading the crane there are two types of work areas for this type of crane: those based on the center of rotation of the Upperworks and those based on the center line of the tracks - Correct Answer center-mounted crawler cranes this boom extension is not normally included in the term "boom length" - Correct Answer jib length when considering boom length between chart listings, always use this of next longer or shorter boom length. never split the difference - Correct Answer lower capacity the horizontal distance from the center of rotation to the center line of the hook or center of gravity of the load when lifted - Correct Answer load radius unless directed by the manufacturer, use the load radius rather than boom angle when determining this - Correct Answer gross capacity when considering load radius between chart listings, use this when the load radius is between the radii listed in the capacity chart - Correct Answer next longer radius on telescoping boom cranes, this is the angle between the bottom of the base boom and the horizontal after the load is lifted - Correct Answer boom angle the boom angle for this type of crane is the angle between the center line of the boom and the horizontal after the load is lifted - Correct Answer lattice boom cranes when considering boom angle between chart listings, use this for those angle listed in the capacity chart - Correct Answer next lower boom angle this is the angle of the jib, in degrees, relative to the centerline of the boom - Correct Answer jib angle offset greater degrees of jib offset provide more of this, however as the jib angle offset increases, the capacity of the jib decreases and the strength of the jib itself is less - Correct Answer outward reach sometimes called rated capacities, these are listed in the capacity charts for the appropriate boom length, boom angle and radius. This is NOT the maximum net loads or objects that can be lifted - Correct Answer gross capacity the combined forces produced by the actual load weight, lifting attachments and movement of the load and attachments - Correct Answer total load the number of hoist ropes which appear to directly support the lower load block or overhaul ball - Correct Answer parts of line weight of hook block + weight of rigging + load weight = suspended weight / SWL of hoist rope = - Correct Answer formula for determining minimum parts of line required 
