Mobile Crane Test (New 2023/ 2024 Update) Questions and Verified Answers| 100% Correct| Graded A
Mobile Crane Test (New 2023/ 2024 Update)
Questions and Verified Answers| 100%
Correct| Graded A
QUESTION
On a mobile cranes range diagram, boom length and boom angle can be used to determine?
a. load weight
b. load radius
c. counterweights
d. gross capacity
Answer:
load radius
QUESTION
On a mobile crane, what is the weight of the stowed jib that is deducted in load chart
calculations called?
a. actual weight
b. non-deducted weight
c. effective weight
d. non-effective weight
Answer:
Effective weight (because it is behind out riggers and becomes counter weight)
QUESTION
When determining boom tip elevation for a mobile crane, the user could:
a. call the manufacturer
b. use the range diagram
c. use the wiring diagram
d. call the site supervisor
Answer:
use the range diagram
QUESTION
The term net capacity is best defined by which of the terms listed below?
a. net load plus capacity
b. capacity deductions minus gross capacity
c. net load minus gross capacity
d. gross capacity minus capacity deductions
Answer:
gross capacity minus capacity deductions
QUESTION
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?
a. effective weight increases
b. effective weight decreases
c. effective weight is reduced 85%
d. effective weight is reduced 75%
Answer:
effective weight increases
QUESTION
mobile cranes that are setup on barges, shall have a list chart provided by which of the entities
listed below?
a. crane owner
b. superintendent
c. manufacturer
d. employer
Answer:
manufacturer
QUESTION
when lifting loads on tires, mobile cranes are rated at what percentage of tipping?
a. 70%
b. 75%
c. 80%
d. 85%
Answer:
75%
QUESTION
How does the effective weight of a stowed extension relate to the actual weight of the
extension?
A. lower than the actual weight
b. depends on the boom angle
c. higher than the actual weight
d. same as the actual weight
Answer:
lower than the actual weight
(stowed is lower because it is uses as counter weight behind outriggers)
QUESTION
When load radius is between radii values, the operator must use the:
a. shorter radius
b. longer radius
c. shorter angle
d. longer angle
Answer:
Longer radius
( when it is between values always take lesser of them longer radius means lower value!)
QUESTION
Why do must crane manufacturers reduce load capacity for duty-cycle operations?
a. the maximum load is almost always known
b. dynamic loads are not encountered
c. side loading forces may occur
d. front loading forces may occur
Answer:
side loading forces may occur
(because of torque you’re putting on it working faster)
QUESTION
why should only approved attachments or extra counterweights provided by the manufacturer be
placed on the rear of crane?
a. they could cause a backward stability problem
b. the crane will develop a swing problem
c. the swing clearance will increase
d. the ground pressure will increase
Answer:
they could cause a backward stability problem
(only use things that are accepted by manufacturer)
QUESTION
A mobile cranes jib is offset 15 degrees versus its original 0 degrees offset, but the boom angle
remains unchanged. In this situation, the load radius:
a. increases
b. remains the same
c. decreases
d. cannot be determined
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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 90º 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 listed below 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 which of the following:
twisting of the main boom.
Which type of wire rope listed below 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 crane is in operation.
1⁄2 inch
Which of the following is classified as a standing wire rope?
Pendant line.
When lifting on outriggers, the floats or pads should always be:
secured to the outriggers cylinder
How many randomly broken wires in a lay length must there be on a mobile cranes 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 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 boom angle?
yes
On a mobile cranes 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 of the terms listed below?
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 of the entities listed below?
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 crane?
They could cause a backward stability problem.
A mobile crane’s jib is offset 150 versus its original 00 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 anti-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 boom to horizontal
What is the device called that automatically stops the boom when it nears the cranes maximum angle?
Boom hoist limiting
When the number of layers of wire rope on a drum increases the:
allowable line pull decreases.
On a mobile crane, side loading of the boom could be caused by which of the following?
Starting or stopping the swing to rapidly
Which person listed below, 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 to the loads center of gravity.
When determining the position to a mobile crane should be left in over night, with high winds in the forecast the operator should:
follow manufacturers recommendations
When performing a multiple crane lift it is important for the operator’s 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?
A flotation 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?
The radius 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 listed below?
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 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 condition 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 personal platforms are hoisted with a mobile crane what item listed below 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.
Which of the following correctly states the requirements 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 practicable way
Before lifting an occupied personnel platform on a jobsite the crew must ensure they perform which of the following
a) Must attend a pre-lift meeting.
b) Must fully deploy all outriggers.
c) Must perform a trial lift.
d) ALL OF THE ABOVE is the answer
Before lifting an occupied personnel platform on a jobsite, which of the following applies?
a) Must use 50% of cranes rated capacity.
b) Must trial lift anticipated load weight.
c) Must ensure rigging is dedicated to platform only.
d) ALL OF THE ABOVE Pg 74,77
Which of the following standards or regulations governs the lifting of personnel in construction?
OSHA 1926. 1431.
According to OSHA 1926.1431, which device listed below must be attached to the crane?
Anti-two-block.
According to OSHA 1926.1431, which of these hoist options 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 shall NOT swing in which direction?
Outward
OSHA 1926. 1431 states that tag lines must be used:
when necessary to control platform.
According to OSHA 1926.1431, while hoisting a personnel platform, what weather condition listed below will promptly 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?
20mph
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 operators station and 2 on the outside of the equipment
According to OSHA table T, what is the minimum clearance for 133kV power lines?
10 feet.
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 feet.
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 feet w/encroachment precautions.
According to OSHA 1926. 1411, when you encounter power lines with a voltage of 44 kV 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 50 kV or below shall be:
10 feet 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 feet w/encroachment precautions.
The term “jib offset” can be expressed as the jib angle to which mobile crane component listed below?
Boom.
On a mobile crane the term “part’s of line” refers to which item listed below?
The number of lines running thru 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.
Which statement listed below is correct about basic load rigging?
As horizontal load angle decreases, stress increases
The approximate percentage of strength of choker, vertical, and basket hitches respectively are:
75%, 100%, 200%.
According to ASME which of the following listed below shall NOT be used for the suspension system on suspended personnel platforms?
Synthetic web bridle.
When rigging a bundle of pipe or tubing, which of the following 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.
Select the correct OSHA Standard Method Hand Signal that matches the illustration.
Move slowly.
Select the correct OSHA Standard Method Hand Signal that matches the illustration.
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.
Select the correct OSHA Standard Method Hand Signal that matches the illustration.
Lower.
Select the correct OSHA Standard Method Hand Signal that matches the illustration.
Swing.
Select the correct OSHA Standard Method Hand Signal that matches the illustration.
Lower boom and raise load.
Select the correct OSHA Standard Method Hand Signal that matches the illustration.
Emergency stop. (both arms extended in the middle)
Select the correct OSHA Standard Method Hand Signal that matches the illustration.
Lower boom. (thumb down)
Select the correct OSHA Standard Method Hand Signal that matches the illustration.
Dog Everything. (both hands on stomach)
Select the correct OSHA Standard Method Hand Signal that matches the illustration.
Raise boom, lower load.
Select the correct OSHA Standard Method Hand Signal that matches the illustration.
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.
Select the correct OSHA Standard Method Hand Signal that matches the illustration.
Use main hoist
Select the correct OSHA Standard Method Hand Signal that matches the illustration.
Hoist.
Select the correct OSHA Standard Method Hand Signal that matches the illustration.
Raise boom.
Select the correct ASME Standard Hand Signal that matches the illustration.
Extend boom.