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1|Page Mobile Crane NCCER 2025, crane operator exam, NCCER 100 questions And answers, rigging and lifting, crane safety test, equipment inspection, verified NCCER answers When determining the "gross load" the best method is: ......answer.....Get an accurate load weight and add the rigging By order of strength which is correct ......answer.....Basket, Vertical, Choker Primary purpose for a roster sheave or auxiliary boom point sheave is to: ceeeee answer.....Separate the hoist line 2|Page When the number of layers of rope on a drum increase the : seeees answer.....Allowable line pull decreases What is the minimum allowable distance from the crane and power lines under 50kV? ......answer.....10' Eccentric main boom tip reeving casues ......answer..... How many randomly broken wires must there be to remove a running wire rope from service? ......answetr.....6 When working near power lines when is a signal person required? cee answer.....When crane moves within a booms length of power lines When operating truck cranes what is the most unstable allowable quadrant of operation? ......answer.....Side 4|Page What is the purpose of using a boom extension? ...... Increase height What do a jib and boom ext. have in common ......answer.....Increase height What is the minimum design factor required for a right regular lay main boom or auxiliary hoist rope?’ ......answer.....3.5 How does the operator determine if the correct load chart is being used? eeeeee answer.....Matching serial numbers If the crane's jib is offset 5 degrees as opposed to an original 15 degrees and the boom angle remains constant you would expect the load radius to do what? ......answer.....To be reduced How does the operator verify the LMs boom length or load radius reading? wena answer.....accutal measurements 5|Page If the rated capacity of the crane is above the solid line or within the shaded areas or has an asterisk next to it this means the capacity is based on: seco answer.....85% tipping How many broken wires must be present in one strand of one lay for running wire rope to be removed from service? ......answet.....3 In a range diagram boom length and angle can be used to determine: Load radius When making a multiple crane lift it is important for the operator to understand that ......answer.....the weight may increase if the other crane lands the load first Most crane manufacturers reduce the load capacity for duty-cycle operations because ......answer.....side loading forces may occur 7|Page Parts of line means ......answer.....the number of lines running through the load block If a jib is erected but not being used, it is treated as deduction from the crane's ......answer.....Gross capacity What are most jib capacities based on? ......answer.....Structural Jib back lash is how much? ......answer.....5 degrees Test loads shell not exceed of manufacturers load ratings of sees answer.....110% Crane hooks must not be twisted in excess of ......answer.....10 degrees-OSHA 8|Page 5 degrees- ASME Acrane hooks throat opening must not exceed OSHA: ......answer.....15% of its original size- OSHA 5% of its original size- ASME Rotation resistant wire rope must not have in excess of: ......answer.....2 randomly broken wires in six wire rope diameters or 4 randomly broken wires in 30 wire rope. A trial lift with unoccupied personnel platform loaded must be: sees answert.....loaded at least with the anticipated weight How many broke wires in one strand in one lay of a wire rope slings will make it necessary to replace the sling? ......answer.....5 1o|Page How many randomly distributed broken wires in one lay of a wire rope sling will make it necessary to replace the sling ......answer.....10 You are inspecting a wire rope sling, assume that you have the proper tools to check for wear on the sling, what are you looking for to remove a wire rope sling from service? ......answer.....wear of 1/3 the diameter of wire rope lifting lugs should be used for straight, vertical lifting only ......answer.....True Turnbuckles should be made of cast steel and should not be welded sees answet.....False Pulling synthetic slings from under a load will cause ......answer.....stitching to become damaged and must be removed from service u|Page Synthetic web slings are in use. Two may be joined together or connected by: seeees answer.....using a shackle how many broken wires in one strand in one lay of a wire rope will make it necessary to replace the wire rope ... rotation resistant wire rope cannot be used ......answer.....on boom hoisting systems line pull is ......answer.....the amount of weight a drum will hoist for a given layer of wire rope Wedge and sockets ......answer.....are the most common way of terminating wire rope on cranes 13|Page What is the height limits for highways? 13 1/2' to 14 (east of Mississippi) & 15' (west of Mississippi) What are the requirements for someone to operate commercial vehicles? sees answer.....pass written & practical exams How often must commercial drivers pass a DOT physical? seen answer.....every 2 (two) years Can a boom sections be stacked for transportation? ...... answer.....Yes What are two type of load binders? ...... answer.....RATCHET type- which are safest to use & 144|Page LEVER type- more dangerous to use. How much pressure is usually required to operate level type binders seeees answer.....170 lbs of pressure -lever type 10 lbs of pressure- ratcheting type How would a truck driver strap down a boom section? ...... answer.....with ratchet straps, boom sections should be supported by adequate blocking @ the end. How would you describe an all-terrain as a cross between what type cranes rough terrain & common truck crane Who is allowed to ride on a crane while it is being driven ...... answer.....No one but the operator 16|Page Breaking strength divided by the design factor: ...... answert.....safe working load (SWL) Best way to determine boom tip elevation is to ...... answer.....use range diagram When lifting a suspended personnel platform the crane must be de-rated by tees answer.....50% Boom deflection will ...... answert.....increase load radius Increasing the distance from the crane's center of gravity and the tipping axis will: ...... answer.....increase stability 17|Page The effect of a load's leverage being greater than the crane's leverage is? seeees answer.....instability Blocking under the outrigger pad/float shall be: ...... answer.....sufficient enough to support the crane and the load With a pick and carry operation, the rated tipping capacity is based on what & of the tipping capacity: ......answer.....75% All telescopic boom cranes must be equipped with ...... answer.....boom angle indicators Acrane’s ground bearing pressure can approach a weight that is: saeaee answer.....100% of the weight of the crane and suspended load 1g|Page If you were to drag a load on a non-centered lift what is the effect on load dynamics? ...... answer.....Increase load weight Buoyancy ...... answer..... The upward force exerted by a liquid or gas on an object immersed in the fluid Is any operational characteristic affected by attempting a non-centered load? saeeee answer.....affects load radius What device that pivots on a fulcrum to move a load? ...... answer.....Lever Who defines the cranes authorized operating quadrants ...... answer.....the manufacturer 20|Page List one factor that can cause a submerged lift which may cause a crane to become unstable ...... answer.....Wave action How can a crane’s center of gravity be affected? ......answer.....Reconfiguring counterweight, extending or retracting outriggers What is the force that is applied to a lever to move a load sees answer.....Moment What is the pendulum effect ...... answer.....the variable force exerted by a swinging load on the crane structure along the hoist line, How much pressure does a 30mph wind exert on a flat surface saeaee answer.....2.6 Ibs per square foot What is impact loading ...... answer.....A short- duration force that is suddenly exerted when a moving object is slowed or stopped 
