Core Review Flashcards
When lifting off the main boom, how is the effective weight of the fly/jib different in the erected position from that of the stowed position?
Effective weight increases. (p.13)
Who must determine maximum speed for a mobile crane to travel with a suspended load?
The competent person. (p.56)
How does the effective weight of a stowed extension relate to the actual weight of the extension?
Lower than the actual weight. (p.13)
Using a telescopic mobile crane and lifting off of the jib with the main boom partially extended, you should use ____ to determine gross capacity.
Boom angle.
If not listed in the load/capacity chart or notes for a telescopic boom crane and you are in between boom lengths, you should ______.
Use the lowest shorter or longer.
What is required to be on a mobile telescopic boom crane in order to lift a personnel platform?
Boom length indicator. (p.75)
When operating a rough terrain crane and extending the outrigger beams from the upper cab you should _____.
Make visual contact with beam and jack. (p.27)
When a mobile crane’s telescopic boom sections are required to be extended equally and they are not, the effect could be _________.
Damage to the longest extended section.
What item can be removed from a carry deck mobile crane and continue to be operational?
Jib/fly/extension. (p.62)
What is the primary reason for lifting off a boom extension mounted on a mobile telescopic boom crane?
Increase height. (p.62)
Traveling a rear engine mounted rough terrain mobile crane with a suspended load, you should position the load _______.
Over the front quadrant. (p.62)
A telescopic mobile crane is equipped with an anti two-block lock-out device. When the device is activated, which functions will be disabled?
Hoist, extend, and lower the boom. (p.18)
What device is NOT required on telescopic boom mobile cranes manufactured today?
Swing path monitor. (p.54)
Backward stability on a rough terrain mobile crane could be a problem when configured in which situation?
Over the side at a minimum radius. (p.59)
A telescopic boom mobile crane is going to lift a personnel platform. What is required to be operational on the crane?
Controlled load lowering. (p.75)
Which boom configuration can cause the most hazardous boom side-loading condition?
Long boom with minimum radius. (p.62)
According to OSHA, when is it safe to hoist loads with a mobile crane below energized power lines?
If fully extended, boom cannot reach the prohibited zone. (p.35)
A crane loses stability when its leverage on the load is _____.
Less than the load’s leverage on the crane. (p.62)
What is the design factor required when using non-rotating wire rope along and lifting personnel in a platform suspended from a mobile crane?
10 (p.77)
When should a tag line be used during the hoisting of material?
When the rotation of the load would be dangerous. (p.56)
When making a lift on outriggers, the maximum ground-bearing pressure occurs in which boom position?
Over the corner. (p.28)
A mobile crane’s jib is offset at 15 degrees versus its original 30 degree offset, but the boom angle remains unchanged. In this situation, the load radius would _____.
Decrease. (p.18)
Blocking or mats under the outrigger pads/float shall be ______.
able to sustain the load and maintain stability. (p.27)
When a telescopic boom extension is offset from the main boom, the crane’s capacity normally will be _____.
reduced. (p.18)
On mobile cranes, the boom angle indicator indicates what to the operator?
Angle of boom to horizontal. (p.17)
If working near power lines and using a tag line, which type of rope is least conductive to electricity?
Polypropylene. (p.33)
Which regulation governs the lifting of personnel with a mobile crane in construction?
OSHA 1926.1431
Backward stability of a mobile crane is tested in which configuration?
Basic boom at maximum angle with no load. (p.59)
On mobile truck cranes operating with outriggers retracted, the least stable position is when the boom is directly over the _____.
side. (p.62)
When a rough terrain crane is working on tires, backwards tipping is most likely to occur when lifting in which configuration?
Side quadrant at a short radius. (p.59)
When traveling a rough terrain mobile crane with a suspended load, what is the most important consideration?
Boom as low as possible with the load close to the surface. (p.62)
When retracting the boom on a telescopic mobile crane, the hook block and load will move in what direction?
Down. (p.62)
Rough terrain mobile crane capacities are generally greater over the _____.
front.
Mobile trick crane capacities are generally greater over the _____.
rear.
OSHA hand signal with both thumbs pointing outwards.
Extend boom. (p.72)
OSHA standard hand signal with both thumbs pointing inwards.
Retract boom. (p.72)
OSHA standard hand signal with thumb down a fingers flexing out/in.
Lower boom and raise load. (p.73)
OSHA standard hand signal with thumb up.
Raise boom. (p.72)
OSHA standard hand signal with palms moving out/in direction.
Wheel travel. (p.72)
OSHA standard hand signal with finger rotating and pointing up.
Hoist. (p.72)
What is the purpose of placing mats or cribbing under outrigger floats?
Distribute the force over a larger area.
Where is the best location for leveling a crane?
Upperworks
Before leveling a mobile crane on outriggers, an operator should ensure _____.
there is no weight of the crane bearing on any tires.
Operating a mobile crane with a long boom, on uneven ground, what support condition should be considered?
Keeping a 90 degree angle between cylinder rod and pad.
When may blocking(cribbing) be placed under outrigger beams on mobile cranes?
Never approved.
Mobile cranes should be level to within what percent of grade?
1%
Timber crane mats work best when they are _____.
bolted together.
When arriving in the crane at the job site, the operator should first determine the condition of the _____.
access roads.
What surface would NOT be a good location for assembly or setup of a mobile crane?
Above underground vaults.
Each outrigger pad and its blocking should be sufficient to support _____.
the total weight of the crane and its load.
How does high wind affect a mobile crane with a long boom?
Introduces side load onto the boom.
When is the only time the outrigger beams should be less than fully extended?
The load chart indicates that this is allowed
What is the primary purpose for a rooster sheave or auxiliary boom point sheave?
Separate the load hoist lines.
Eccentric main boom tip reeving causes what?
Twisting of the main boom.
Which type of wire rope is installed on most cranes?
Right regular lay.
The hoist drum flange shall extend a minimum of _____ over the top layer of wire rope at all times while the crane is in operation.
1/2 inch
What is classified as a standing wire rope?
Pendant line.
When lifting on outriggers, the floats or pads should always be ______.
secured to the outrigger’s cylinder.
How many randomly broken wires in a lay length must there be in a mobile crane’s hoist line before it should be removed from service?
6.
What is the minimum design factor required for a right regular lay, boom or hoist wire rope?
3.5
On a mobile crane, how many broken wires are permitted at the end connection of a pendant line before it must be taken out of service?
1.
Type 1 rotation resistant hoist wire rope has a design factor of____.
5 to 1
It is important to know when lubricating crane hoist wire rope that the lubricant must _______.
not hinder visual inspection.
How often is the competent person required to inspect the running wire ropes on a mobile crane?
Each shift.
On mobile cranes, how many broken wires must be present in one strand of one lay for running wire rope to be removed from service?
3.
How many randomly distributed broken wires in rotation-resistant hoist wire rope are considered for replacement?
2 broken wires in 6 rope diameters.
According to OSHA, what is the minimum number of full wraps of wire rope that must remain on hoist drums in all service conditions?
2.
On whose recommendations should a mobile crane preventative maintenance program be developed?
Crane manufacturer.
On a mobile crane, the measurement for the load radius is the distance from the center of gravity of the suspended load to the _____.
center of rotation of the crane.
On a mobile crane, should the load be applied when determining the proper hook angle?
Yes.
On a mobile crane’s range diagram, boom length and boom angle can be used to determine ______.
Load radius.
On a mobile crane, what is the weight of the stowed jib that is deducted in load chart calculations called?
Effective weight.
When determining boom tip elevation for a mobile crane, the user could ____.
use the range diagram.
The term net capacity is best defined by which term?
Gross capacity minus capacity deductions.
When lifting off the main boom, how is the effective weight of the fly/jib different in the erected position from that of the stowed position?
Effective weight increases.
Mobile cranes that are setup on barges shall have a list chart provided by which entity?
Manufacturer.
When lifting loads on tires, mobile cranes are rated at what percentage of tipping?
75%.
How does the effective weight of a stowed extension relate to the actual weight of the extension?
Lower than the actual weight.
When load radius is between radii values, the operator must use the ____.
Longer radius.
Why do most crane manufacturers reduce load capacity for duty cycle operations?
Side loading forces may occur.
Why should only approved attachments or extra counterweights provided by the manufacturer be placed on the rear of the crane?
They could cause a backward stability problem.
A mobile crane’s jib is offset 15 degrees versus its original 0 degree offset, but the boom angle remains unchanged. In this situation, the load radius _____.
increases.
What is the difference between an anti-two-block warning device and an ant-two-block prevention device?
Warning device only warns, but prevention devices will stop the functions.
How can the LMI’s boom length or load radius reading be verified?
Actual measurements.
On mobile cranes, what does the boom angle indicator show the operator?
Angle of the boom to horizontal.
What is the device called that automatically stops the boom when it nears the crane’s maximum angle?
Boom hoist limiting.
When the number of layers of wire rope on a drum increases, the _____.
allowable line pull decreases.
In a mobile crane, side loading of the boom could be caused by what?
Starting or stopping the swing too rapidly.
Which person has the responsibility for determining the correct weight of a load?
Lift director.
What must an operator do when an operator leaves the controls of the crane for an extended period of time?
Apply all brakes and dogs, and lower the load to the ground.
Abruptly stopping a rapid swing on a long boom mobile crane will produce what major effect?
Collapsing the boom.
When should a tag line be used during the hoisting of material?
When the rotation of the load would be dangerous.
What percentage of the rated capacity of a mobile crane must be used when lifting with two cranes attached to the same load?
75%
When lifting a load with two mobile cranes, it is very important to ____.
keep the hoist lines of both cranes vertical.
If lifting a load with two mobile cranes of different rated capacities, the crane with the larger rated capacity should _____.
be hooked at a distance closer the load’s center of gravity.
When determining the position a mobile crane should be left in over night, with high winds in the forecast the operator should ______.
follow the manufacturer’s recommendations.
When performing a multiple crane lift, it is important for the operators of each crane to understand that _____.
the weight may increase if the other crane lands the load.
When lifting loads that are submerged under water with a mobile crane, what is one of the conditions that the operator should be familiar with?
Load will increase when lifting the load out of the water.
When lifting over water with a personnel platform, what are the occupants of the platform required to wear?
Floatation device.
If a mobile crane is NOT set up level and the operator swings the load from the high side to the low side, what effect will that have on the radius?
Radius will increase.
Increasing the distance from the crane’s center of gravity to the tipping axis will have what effect on a mobile crane?
Increase stability.
Backward stability of a mobile crane is tested in which configuration?
Basic boom at maximum angle with no load.
What is the minimum pitch diameter used for sheaves in a boom hoist reeving system using rotation resistant wire rope?
Not less than 18 times rope diameter.
When can capacity altering modifications be made to mobile cranes?
When permission is given by the crane manufacturer.
A crane is at the point of instability when the crane’s leverage on the load equals _____.
100% of the load’s leverage on the crane.
Who must determine maximum speed for a mobile crane to travel with a suspended load?
The competent person.
Deflection of the boom while operating a mobile crane will increase ____.
load radius.
A sudden start or stop of the hoisting function while operating a mobile crane can produce a ______.
dynamic load.
When traveling with a suspended load on a mobile crane climbing an incline, the load should be carried in which direction?
Uphill.
Which mobile crane boom configuration can cause the most hazardous side-loading for the crane?
Long boom with minimum radius.
When preparing to hoist a load, the load block hook should be positioned _____.
directly above the load’s center of gravity.
When making a lift on outriggers, the maximum ground-bearing pressure occurs in which boom position?
Over the corner.
When personnel platforms are hoisted with a mobile crane, what item must be provided?
An anti two-block device.
Personnel platforms suspended on the hook of a mobile crane must not exceed what percentage of a crane’s capacity at any given radius?
50%
When proof testing a personnel platform to 125% of its rated capacity, how long must the platform be suspended?
5 minutes.
What is the requirement for hooks used to hoist employees on a crane-supported personnel platform?
Hooks shall have a latch that closes and locks.
OSHA permits hoisting of personnel by a crane as long as the employer can show ____.
there is no less hazardous or practical way.
Before lifting an occupied personnel platform on a job site, the crew must ensure they perform ______.
pre-lift meeting, fully deploy all outriggers, and performs trial lift.
Before lifting an occupied personnel platform on a job site you must _____.
use 50% of crane’s rated capacity, trial lift anticipated load weight, and ensure rigging is dedicated to platform only.
Which of the following standards or regulations governs the lifting of personnel in construction?
OSHA 1926.1431
According to OSHA 1926.1431, which device must be attached to the crane?
Anti two-block.
According to OSHA 1926.1431, which hoist option is prohibited?
Hoist free fall.
Inside the personnel platform, except for gates, how much of the perimeter must contain a grab rail for the occupants?
100 percent.
According to OSHA 1926.1431, during personnel platform hoisting operations, access gates should not swing in which direction?
Outward.
OSHA 1926.1431 states that tag lines must be used ______.
when necessary to control the platform.
According to OSHA 1926.1431, while hoisting a personnel platform, what weather condition will prompt discontinue the operation?
Dangerous.
While hoisting employees in a personnel platform, direct communication must be maintained between the signal person and who?
Operator.
According to OSHA 1926.1431, at what wind speed must a qualified person be consulted?
20 mph.
If working near power lines and using a tag line, which type of rope is least conductive to electricity?
Polypropylene.
When working near power lines with a mobile crane, where does OSHA require caution stickers be installed on all equipment?
At operator’s station and 2 on the outside of the equipment.
According to OSHA table T, what is the minimum clearance for 133kV power lines?
10’
According to OSHA, when working near power lines, when is a dedicated spotter required?
When crane operator is unable to see the warning line of signs.
According to OSHA’s table T, what clearance should a mobile crane IN TRANSIT keep while going under 445kV lines?
16’
According to OSHA, when is it safe to hoist loads with a mobile crane below energized power lines?
When the fully extended boom can’t reach the prohibited zone.
According to OSHA 1926.1408, when operating near high voltage power lines, what clearance shall be required when the rating of the lines is 275kV?
20’ w/encroachment precautions.
According to OSHA 1926.1411, when you encounter power lines with a voltage of 44kV and the crane is TRAVELING, according to Table T, what is the minimum required clearance?
6’
According to OSHA 1926.1408, the minimum clearance between any part of the crane and power lines rated 50kV or below shall be ______.
10’ w/encroachment precautions.
According to OSHA 1926.1408, for power lines rated 100 kV, the minimum clearance between the crane and any lines shall be ______.
15’ w/encroachment precautions.
The term “jib offset” can be expressed as the jib angle to which mobile crane component?
Boom.
On a mobile crane, the term “parts of line” refers to which item?
The number of lines running through the load block and boom point sheaves.
According to OSHA, mobile crane load block hooks must not have a twist in excess of _____.
0 degrees.
According to OSHA, mobile crane load block hooks must not have a throat opening in excess of ______.
5% of its original size.
What is the design factor for grade 80 chain slings?
4.
What grade alloy steel chain should be used for hoisting slings?
80.
Loads rigged using a basket hitch should be ____ to prevent slippage.
balanced
When slings encounter sharp edges on loads to be lifted, riggers shall ensure that slings are ______.
protected or padded.
According to OSHA, quadruple sling bridle ratings are the same as ____.
triple sling bridle ratings.
When correctly installing U-bolt type wire rope clips, the U portion of the clip shall be on ______.
the dead or short end.
True or False. As horizontal load angle decreases, stress increases.
True.
The approximate percentage of strength of choker, vertical, and basket hitches respectively are _____.
75%, 100%, 200%.
According to ASME, what shall NOT be used for the suspension system on suspended personnel platforms?
Synthetic web bridle.
When rigging a bundle of pipe or tubing, what would provide the best contact between sling and load?
Double wrap choker.
What is the angle between the top of the load and the sling leg referred to in sling load charts?
Horizontal sling angle.
When installing a wedge socket, it must be attached with the load line pulling in a straight line from the ____.
pin.
For any signal other than emergency stop, who is permitted to give hand signals to the crane operator during a lift?
A qualified signal person.
OSHA Standard Method Hand Signal with upward rotating finger below palm.
Move slowly.
OSHA hand signal with fist above elbow over palm.
Use whipline.
What is the first element of voice signals given to a crane operator prior to the lift?
Function and direction.
According to OSHA, each series of voice signals contain how many elements?
Three.
OSHA hand signal with finger rotating pointing down.
Lower.
OSHA hand signal with arm out and palm down.
Swing.
OSHA hand signal with both arms moving in/out horizontally.
Emergency stop.
OSHA hand signal with both hands holding opposite forearm.
Dog everything.
OSHA hand signal with one arm moving in/out horizontally.
Stop.
When directing a crane using voice signals, the transmission must be through a channel that is _____.
dedicated.
Before commencing lifting operations, the operator and signal person must contact and identify each other when using which form of communication?
Voice signals.
According to OSHA, where must a signal chart be posted?
On the equipment or in the area of the hoisting operation.
How many audible travel signals are there?
3.
OSHA hand signal with fist on top of head.
Use main hoist.
OSHA hand signal with thumb pointing outwards while other hand holds tag line.
Extend boom.
