Mobile Crane Questions Test #9 UPDATED
ACTUAL Exam Questions and CORRECT
Answers
Crane configuration includes: - CORRECT ANSWER Reeving, length, counterweight, on
outriggers, on rubber, extensions or jib stowed or mounted, off sets, wire rope type or
construction.
How does the operator determine the manufacturers recommended rope for the crane? -
CORRECT ANSWER Read the manufacturer load chart or operator manual.
Capacities above the bold line on the load chart are based on: - CORRECT
ANSWER Structural strength.
If replacing the hoist line wire rope on a crane, how do you determine the size or type of wire
rope to use? - CORRECT ANSWER Use the manufacturer's operator's manual or load
chart.
Net capacity is equal to: - CORRECT ANSWER Gross capacity minus capacity
deductions.
Which of these conditions will dramatically affect the values illustrated on load charts? -
CORRECT ANSWER All: Improper outrigger setup, Changing radius and Wind.
If a jib is erected but not being used, it is treated as a deduction from the cranes: - CORRECT
ANSWER Gross capacity.
A truck crane is rated at what percentage of its load capacity? - CORRECT
ANSWER 85%.
, When determining the "gross load" the best method is: - CORRECT ANSWER Get an
accurate load weight and add the rigging.
Tipping capacities of crawler cranes are based on what percentage of tipping? - CORRECT
ANSWER 75%
How does the operator determine if the correct load chart is being used? - CORRECT
ANSWER Matching serial number.
In a range diagram, boom length and angle can be used to determine: - CORRECT
ANSWER Load radius.
Only approved attachments or extra counterweights made by the manufacturer should be placed
on the rear of the crane because: - CORRECT ANSWER They could cause a backward
stability problem.
If not listed in the load/capacity charts for a telescopic crane and you are in between boom
length, you should: - CORRECT ANSWER Use the next longer length.
The jib capacity is 8 tons and the ball weighs 900 lbs. What is the heaviest load that can be lifted
safely? - CORRECT ANSWER 15,100 lbs.
When using load/capacity charts, what does the term "jib angle to ground" refer to? - CORRECT
ANSWER Main boom angle minus the jibs offset.
When making a lift on the main boom of an RT, the stowed lattice swing-a-way section: -
CORRECT ANSWER Should be considered part of the cranes deductions.
When you change the jib to ground angle from 40º to 30º, you have: - CORRECT
ANSWER Decreased the capacity of the jib.
ACTUAL Exam Questions and CORRECT
Answers
Crane configuration includes: - CORRECT ANSWER Reeving, length, counterweight, on
outriggers, on rubber, extensions or jib stowed or mounted, off sets, wire rope type or
construction.
How does the operator determine the manufacturers recommended rope for the crane? -
CORRECT ANSWER Read the manufacturer load chart or operator manual.
Capacities above the bold line on the load chart are based on: - CORRECT
ANSWER Structural strength.
If replacing the hoist line wire rope on a crane, how do you determine the size or type of wire
rope to use? - CORRECT ANSWER Use the manufacturer's operator's manual or load
chart.
Net capacity is equal to: - CORRECT ANSWER Gross capacity minus capacity
deductions.
Which of these conditions will dramatically affect the values illustrated on load charts? -
CORRECT ANSWER All: Improper outrigger setup, Changing radius and Wind.
If a jib is erected but not being used, it is treated as a deduction from the cranes: - CORRECT
ANSWER Gross capacity.
A truck crane is rated at what percentage of its load capacity? - CORRECT
ANSWER 85%.
, When determining the "gross load" the best method is: - CORRECT ANSWER Get an
accurate load weight and add the rigging.
Tipping capacities of crawler cranes are based on what percentage of tipping? - CORRECT
ANSWER 75%
How does the operator determine if the correct load chart is being used? - CORRECT
ANSWER Matching serial number.
In a range diagram, boom length and angle can be used to determine: - CORRECT
ANSWER Load radius.
Only approved attachments or extra counterweights made by the manufacturer should be placed
on the rear of the crane because: - CORRECT ANSWER They could cause a backward
stability problem.
If not listed in the load/capacity charts for a telescopic crane and you are in between boom
length, you should: - CORRECT ANSWER Use the next longer length.
The jib capacity is 8 tons and the ball weighs 900 lbs. What is the heaviest load that can be lifted
safely? - CORRECT ANSWER 15,100 lbs.
When using load/capacity charts, what does the term "jib angle to ground" refer to? - CORRECT
ANSWER Main boom angle minus the jibs offset.
When making a lift on the main boom of an RT, the stowed lattice swing-a-way section: -
CORRECT ANSWER Should be considered part of the cranes deductions.
When you change the jib to ground angle from 40º to 30º, you have: - CORRECT
ANSWER Decreased the capacity of the jib.
