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Ncco Core (425 Questions And Solutions)
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When operating a truck crane what is the most unstable allowable quadrant of operation? a) Front b) Rear c) Side d) Corner - Solution C) Side What is not a good location for crane setup? a) Top of a hill b) Hard fill c) Above utilities d) Concrete - Solution C) above utilities When an operator arrives at the jobsite and the crane is already erected, how would the operator check the main and auxiliary hoist brakes? a) Check pedal for the correct feel b) Rely on the superintendent to verify the brakes are functioning properly c) Make the lift and see what happens d) Lift the load off the ground and apply the brake - Solution d) Lift the load off the ground and apply the brake What is the difference between an Anti-two-block warning and an Anti-two- block prevention system? a) Warning device only warns, but prevention system will stop the operation b) Prevention system only warns, but warning device stops the operation c) Both are the same d) Both will warn and stop the dangerous operation - Solution a) Warning device only warns, but prevention system will stop the operation Who gives the operator hand signals? a) The foreman b) The Superintendent c) The qualified person d) Anyone who wants to. - Solution C) the qualified person
Why use mats or cribbing? a) To lift outriggers or crawler off the ground b) To reduce ground pressure c) For long boom cranes d) To stop mud from entering crawlers - Solution B) to reduce ground pressure Tipping capacities of RT cranes with retracted outriggers are based on what percentage of tipping? a) 70% b) 80% c) 85% d) 75% - Solution D) 75 Should the load be applied when determining the proper boom angle? a) Yes b) No c) Depends on lift conditions d) Only during critical lifts - Solution A) yes When should the operator use the run by the seat of the pants technique? a) Always b) Never c) When not making a critical lift d) Only when making a critical lift - Solution B) never Load radius is the distance from the center of gravity of the suspended load to the: a) Center of rotation b) Center of gravity of the crane c) Tipping Axis d) Hook rollers - Solution A) center of rotation What is the primary reason for using a boom extension? a) Increase load radius b) Decrease load radius c) Increase height d) Increase reach - Solution C) increase height
d) Headache ball - Solution B) access roads How does the operator verify the LMI's boom length or load radius reading? a) Actual measurements b) No need to verify c) Calibrate the LMI d) Check with superintendent - Solution A) actual measurements 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: a) 75% of structural competence b) Structural competence c) 85% of tipping d) tipping - Solution B) structural competence All hazards and potential problems should be discovered during the: a) Pre-lift site inspection b) Actual lift operation c) Daily safety meeting d) Coffee break - Solution A) pre-lift site inspection How many broken wires must be present in one strand of one lay for running wire rope to be removed from service? a) 3 b) 4 c) 2 d) 6 - Solution A) 3 In a range diagram, boom length and angle can be used to determine: a) Load weight b) Load radius c) Counterweight requirements d) Net capacity - Solution B) load radius When making a multiple crane lift it is important for the operator to understand that: a) The weight is equally distributed at all times b) The weight is never equally distributed c) The weight may increase if the other crane lands the load
d) The weight may decrease if the other crane lands on the load - Solution c) The weight may increase if the other crane lands the load If a crane is not set up level and the operator swings a load from the high side to the low side, the load radius will: a) Decrease b) Stay the same c) Increase two feet for every one degree out of level d) Increase - Solution D) increase Most crane manufacturers reduce load capacity for duty-cycle operations because: a) The Maximum load is almost always known b) Dynamic loads are not encountered c) Side loading forced may occur d) The outward swing of the load decrease the load radius - Solution C) side loading forced may occur On whose recommendation should a preventative maintenance program be setup? a) Master Mechanic b) Crane operator c) Company supervisor d) Crane manufacturer - Solution D) crane manufacturer What is the standard rope used on most cranes? a) Right regular lay b) Right alternate lay c) Left regular lay d) Non-spin - Solution A) right regular lay The proper way to calibrate a boom angle indicator is: a) Use a protractor b) Boom up against the stops and set the indicator at 90° c) Using a level, raise the boom to horizontal and set the indicator at 0° d) Call the company's mechanic - Solution C) Using a level, raise the boom to horizontal and set the indicator at 0° The red area of an instrument gauge means: a) Caution should be taken
d) the load will increase when you pick the load from the water - Solution d) the load will increase when you pick the load from the water What is required to be on a Hydraulic Crane in order for it to lift a man basket? a) Boom length indicator b) Radio communication c) Free fall capability d) Two operators - Solution A) boom length indicator When working on rubber, cranes are rated at what percentage of tipping? a) 70% b) 75% c) 80% d) 85% - Solution B) 75% When using cable or nylon straps it is important to remember: a) The strap angle does not affect tension b) The lower the strap angle the greater the tension c) The higher the strap angle the greater the tension d) The lower the strap angle the lesser the tension - Solution B) the lower the strap angle the greater the tension Backward stability of a crane is tested with: a) Basic boom at maximum angle with maximum load b) Maximum boom at maximum angle with maximum load c) Basic boom at minimum angle with no load d) Basic boom at maximum angle with no load - Solution D) basic boom at maximum angle with no load If not listed in the load/capacity charts for a hydraulic crane and you are in between boom lengths, you should: a) use the next longer length b) use the next shorter length c) use the length closest to the actual length d) use the range diagram - Solution A) use the next lounger length When a spinning load presents a danger, the operator should: a) keep the load close to the ground b) run load to the tip of boom
c) tell everybody to stay clear d) use a tagline - Solution D) use a tagline Parts of line means: a) the amount strands in the load line b) the number of sheaves in the load block c) the number of vertical lines running between the load block and boom tip d) the number of load lines on the crane - Solution c) the number of vertical lines running between the load block and boom tip If a jib is erected but not used, it is treated as a deduction from the cranes: a) gross capacity b) boom lengths c) swing radius d) net capacity - Solution A) gross capacity What is the maximum number of broken wires acceptable before replacement on a standing wire rope between the end sockets in one lay? a) 2 b) 6 c) 1 d) 4 - Solution A) 2 What are most jibs capacities based on? a) Working radius b) Main boom length c) Tipping d) Structural - Solution D) structural When setting up the crane near a newly constructed building, what concerns the operator the most? a) damaging the flowers b) compaction of the soil c) access to the building d) what time the roach coach arrives - Solution B) compaction of the soil When lifting with two or more cranes, a _____________________ is required. a) radio b) engineer
Power is transferred to the swing through a: a) pinion gear b) bevel gear c) transmission d) torque converter - Solution A) pinion gear LMIs shall be installed on cranes with a lifting capacity of: a) 3 tons and above b) 5 ton and above c) 10 ton and above d) 15 ton and above - Solution A) 3 tons and above When lifting personnel the cranes hook must be the type that: a) can be closed and locked b) is an open throat hook c) have a spring loaded non-locking latch d) has a double locking latch - Solution A) can be closed and locked When working over water with a man basket are the people inside required to wear a belt / harness? a) No harness or belt required b) Belt harness is always required c) Seat belts are acceptable d) Only when the supervisor requires it - Solution A) no harness or belt required When given verbal instructions, the last part of the instruction should be: a) Function. b) Direction of travel. c) Stop. d) Radio Identifier. - Solution C) stop When working near power lines, where should caution stickers be installed? a) On carrier and on the barriers b) On barriers and on crane boom c) At operators station and on the outside of the crane d) At operators station and on the barriers - Solution C) at operators station and on the outside of the crane
Jib backlash how much? a) 10 degrees b) 15 degrees c) 5 degrees d) 0 degrees - Solution C) 5 degrees Cranes must be level to within ___% grade. a) 3% b) 2% c) 5% d) 1% - Solution D) 1% A frequent inspection is: a) Monthly to annually b) Daily to monthly c) Hourly to daily d) Daily to weekly - Solution B) daily to monthly A periodic inspection is: a) Monthly to annually b) Daily to monthly c) Hourly to daily d) Daily to weekly - Solution A) monthly to annually Test loads shall not exceed ___ of manufacturers load ratings. a) 100% b) 110% c) 115% d) 120% - Solution B) 110% Crane idle for more than 6 months must have _____ inspections performed. a) Frequent and periodic b) Daily and weekly c) Daily d) No inspections required - Solution A) frequent and periodic Cranes idle for less than 6 months must have what type inspection performed.
c) no less then 8" x 8" d) railroad ties - Solution A) run parallel to the outrigger beams What quadrant produces the least amount of ground pressure on a mobile truck crane: a) corner b) side c) front d) rear - Solution B) side Rotation resistant wire rope can be used with a swivel: a) only if the wire rope manufacturer approves it. b) always c) never d) if the operator okays it - Solution A) only if the wire rope manufacture approves it Abruptly stopping a rapid swing on a long-boom mobile crane will produce what major effect? a) Overheating the swing brake b) Overturning the crane or collapsing the boom c) Increased pressure on the crane's draw works d) Rope vibration - Solution B) overturning the crane or collapsing When the boom handle is released to its center position, which action should be expected? a) The boom hoist safety pawl will be automatically disengaged b) The boom hoist will be held stationary c) The swing brake will be automatically applied d) The load hoist drum will freewheel until the hoist brake is engaged - Solution B) the boom hoist will be held stationary On a telescopic boom, the main boom length is measured from the: a) end of the boom section to the center tip of the head section b) ground to top of head section c) center of the boom hinge pin to the center of the boom tip sheave d) crane's center of rotation to the center of the sheave on the boom head - Solution c) center of the boom hinge pin to the center of the boom tip sheave
. If you can't level your crawler crane: a) don't operate crane b) reduce capacity 50% c) operate only on high side d) operate only on low side - Solution A) don't operate crane What effects does having the outriggers retracted have on a mobile truck crane with a long boom? a) Decrease track wear b) Decrease in capacity c) Increase in capacity d) Increase track wear - Solution B) decrease in capacity If your mobile crane is on a barge, it is necessary to: a) reduce the load chart by 60% b) reduce the chart by 40% c) call maritime inspector d) secure the crane to the barge - Solution D) secure the crane to the barge A basket hitch is what percentage of a vertical hitch's capacity? a) 100% b) 50% c) 200% d) 85% - Solution C) 200% When using a mobile crane on a barge, the crane's load capacity chart shall be: a) replaced by a list chart b) de-rated to 40% c) de-rated to 60% d) replaced by a duty cycle chart - Solution A) replaced by a list chart How many broken wires are permitted at the end connection of a pendant before it must be taken out of service? a) 6 b) 5 c) 3 d) 1 - Solution D) 1
d) unloaded boom and the carrier deck - Solution A) loaded boom and the horizontal When a mobile truck crane is lifting on outriggers, the floats or pads should always be: a) Large enough to support two times the applied load. b) With the tires firmly on the ground. c) Secured to the outriggers d) Placed on mats. - Solution C) secured to the outriggers Hydraulic valves that supply the outriggers shall be the type: a) holds in case of high winds b) holds in case of the crane is tipping and resting on the tipping axis outriggers c) holds in case of a hose break or failure d) holds the float tight to the jack. - Solution C) holds in case of a hose break or failure It is illegal to fly oxy / acetylene bottles with: a) the caps on & regulators off b) the caps off & regulators on c) each other d) a tag line. - Solution B) the caps off & regulators on Which of the following is the strongest 2 point pick? a) Both off the main b) Off the main and an auxiliary head c) Off the main and the jib d) Over the front & over the rear - Solution A) both off the main When you change the jib offset angle from 15° to 5° you have: a) decreased the head clearance b) increased jib gantry angle c) shortened the forestay pendants d) increased the capacity of the jib - Solution D) increased the capacity of the jib A truck crane operating with outriggers fully extended and set, does not have a fifth front outrigger, the operator should: a) use higher boom angles over the front
b) refer to the manufacturers working area diagram c) block under the bumper to provide more stability d) only operate over the front at a 50° reduction of the load chart - Solution B) refer to the manufactures working area diagram According to OSHA, which do you check prior to crane operations? a) Exhaust systems b) Ground conditions c) Vehicle brakes d) Hydraulic valves - Solution B) ground conditions What type of weight is the crane's jib when it is erected? a) Actual b) Deduction c) Effective d) Net - Solution C) effective When a lattice boom truck crane is operating on properly set outriggers, the tipping axis is located at the: a) radius of the counterweights b) center pin of the crane c) boom heel pins d) point where the outriggers touch the ground - Solution D) point where the outriggers touch the ground The purpose of placing mats or cribbing under outrigger floats is to: a) get the tires off the ground b) distribute the downward force of the float over a larger area c) allow the float to be level d) raise the operators cab for better vision - Solution B) distribute the downward force of the float over a larger area What is the least desirable location for crane setup? a) Above utilities b) Hard fill c) Top of a hill d) Concrete - Solution A) above utilities If a mobile truck crane is going to perform work over the front it must have: a) a second signal person
a) be increased b) be reduced c) not change d) not change because the jib cannot be offset - Solution B) be reduced The safest speed for a crane carrying a load is: a) the manufacturer's speed limit b) the job site's speed limit c) the speed recommended by the superintendent d) the speed recommended by the oiler - Solution A) the manufacturer's speed limit The boom angle indicator indicates: a) gross capacity b) angle of boom to horizontal c) angle of boom to vertical d) net capacity - Solution B) angle or boom to horizontal When performing a pick and carry lift with a rough-terrain hydraulic crane, which of the following is the most important consideration? a) Ensuring that at least two hand held tag lines are used. b) Moving away from the load to avoid load contact with the crane c) Keeping the boom as low as possible with the load close to the ground d) Keeping the load above the eye level for visibility - Solution C) keeping the boom as low as possible with the load close to the ground Jib offset is the jib angle to the: a) Ground b) Vertical c) Horizontal d) boom - Solution D) boom According to ASME B30.5 the prohibited zone for power lines that are 60kV, is: a) 10ft b) 12ft c) 15ft d) 20ft - Solution C) 15ft
How many broken wires at an end socket of a standing wire rope are allowed before the wire rope must be replaced? a) 1 b) 2 c) 3 d) 6 - Solution A) 1 When operating a mobile crane, you inspect your running wire rope at least: a) daily b) weekly c) monthly d) yearly - Solution C) monthly Rotation resistant wire rope has a design factor of: a) 2.5 to 1 b) 3 to 1 c) 3.5 to 1 d) 5 to 1 - Solution D) 5 to 1 Line pull is: a) the amount of weight a drum will hoist for a given layer b) the amount of weight required to pull the line off a drum c) the amount of tension required to initially install rope on a drum d) the amount of wire rope necessary to fill a drum - Solution a) the amount of weight a drum will hoist for a given layer The length of a telescopic boom is measured from the: a) Center of the hinge pin to the center of the head sheave pins b) End of the heel section to the tip of the sheaves c) Center of the heel section to the center of the head section d) Tip of the head section to the ground - Solution A) center of the hinge pin to the center of the head sheave pins A crane's rated capacity is based upon: a) structural and stability b) structural and load capacities c) tipping and radius d) stability and boom angle - Solution A) structural and stability
