CCO PRACTICE EXAM Study for Crane
Questions with Answers (100% Correct
Answers)
When working on rubber, cranes are rated at what percentage of tipping:
a) 70%
b) 75%
c) 80%
d) 85%
Ans: 75%
When a crane is working "on outriggers" the only time they should be less than fully
extended is when:
a) working alongside the highway and cannot block a lane
b) you are handling light loads
c) the main boom is being lifted
d) there is a load chart for this operation
Ans: there is a load chart for this operation
A truck crane set up with the outriggers extended and set, and tires touching the
ground, the operator should refer to what load chart:
a) intermediate chart
b) over the front chart
c) on rubber chart
d) 85% of the main chart
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,Ans: on rubber chart
Blocking paced under the ends of crawler tracks will:
a) increase the crane's stability when operating over front or back
b) increase the crane's stability when operating over side
c) stop crane from traveling unexpectedly
d)stop crane from sliding unexpectedly
Ans: increase the crane's stability when operating over front or back
What quadrant produces the least amount of ground pressure on a lattice crawler:
a) corner
b) side
c) front
d) rear
Ans: side
During assembly where should you attach slings to lift boom sections:
a) to the top of main chords
b) to the top end fittings
c) 2 feet from end of section
d) center of boom section
Ans: to the top end fittings
When a lattice boom truck crane is set up 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
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, d) placed on the mats
Ans: secured to the outriggers
A truck crane operating with outriggers fully extended and set, but does not have a
front outrigger, the operator should:
a) operate over the front with caution
b) refer to the manufacturer's 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
Ans: refer to the manufacturer's working area diagram
When a crane is operating on properly set outriggers, the tipping axis is located at the:
a) radius of the counterweight
b) center pin of the crane
c) boom heel pins
d) point where the outriggers touch the ground
Ans: 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 operator's cab for better vision
Ans: distribute the downward force of the float over a larger area
A crane loses stability when its leverage on the load is:
a) less than a load's leverage on the crane
b) 70% of the load's leverage on the crane
© 2025 All rights reserved
Questions with Answers (100% Correct
Answers)
When working on rubber, cranes are rated at what percentage of tipping:
a) 70%
b) 75%
c) 80%
d) 85%
Ans: 75%
When a crane is working "on outriggers" the only time they should be less than fully
extended is when:
a) working alongside the highway and cannot block a lane
b) you are handling light loads
c) the main boom is being lifted
d) there is a load chart for this operation
Ans: there is a load chart for this operation
A truck crane set up with the outriggers extended and set, and tires touching the
ground, the operator should refer to what load chart:
a) intermediate chart
b) over the front chart
c) on rubber chart
d) 85% of the main chart
© 2025 All rights reserved
,Ans: on rubber chart
Blocking paced under the ends of crawler tracks will:
a) increase the crane's stability when operating over front or back
b) increase the crane's stability when operating over side
c) stop crane from traveling unexpectedly
d)stop crane from sliding unexpectedly
Ans: increase the crane's stability when operating over front or back
What quadrant produces the least amount of ground pressure on a lattice crawler:
a) corner
b) side
c) front
d) rear
Ans: side
During assembly where should you attach slings to lift boom sections:
a) to the top of main chords
b) to the top end fittings
c) 2 feet from end of section
d) center of boom section
Ans: to the top end fittings
When a lattice boom truck crane is set up 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
© 2025 All rights reserved
, d) placed on the mats
Ans: secured to the outriggers
A truck crane operating with outriggers fully extended and set, but does not have a
front outrigger, the operator should:
a) operate over the front with caution
b) refer to the manufacturer's 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
Ans: refer to the manufacturer's working area diagram
When a crane is operating on properly set outriggers, the tipping axis is located at the:
a) radius of the counterweight
b) center pin of the crane
c) boom heel pins
d) point where the outriggers touch the ground
Ans: 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 operator's cab for better vision
Ans: distribute the downward force of the float over a larger area
A crane loses stability when its leverage on the load is:
a) less than a load's leverage on the crane
b) 70% of the load's leverage on the crane
© 2025 All rights reserved
