CO Cranes & Hoisting Contractor Exam
Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2027 Q&A| Instant
Download Pdf.
1. Which condition is most important to verify before placing a mobile
crane into service on a construction site?
A. The operator has completed the daily paperwork only
B. The crane's rated capacity exceeds the weight of the operator
C. The crane is inspected, properly configured, and suitable for the
planned lift
D. The crane has operated successfully on the previous project
A crane must be inspected and confirmed suitable for the intended lift,
including configuration, capacity, ground conditions, and operating
environment.
2. What is the primary purpose of a crane load chart?
A. To determine the crane's fuel consumption
B. To establish the operator's maximum working hours
C. To identify allowable lifting capacities for specific crane configurations
and conditions
D. To determine the required number of signal persons
,A load chart establishes the crane's rated capacity based on factors such
as boom length, radius, configuration, and counterweight arrangement.
3. When determining crane capacity, what does load radius generally
mean?
A. The distance between the crane wheels
B. The length of the boom
C. The height of the hook above the ground
D. The horizontal distance from the crane's center of rotation to the
load's center of gravity or load line
Load radius is a critical capacity factor because crane lifting capacity
generally decreases as the horizontal distance from the center of
rotation increases.
4. What is the most significant reason that crane capacity may
decrease as the boom is extended?
A. The engine becomes louder
B. The crane becomes easier to steer
C. The increased radius and leverage increase overturning forces
D. The hydraulic oil becomes heavier
Extending the boom can increase operating radius and overturning
moment, reducing the crane's permissible lifting capacity.
5. Before making a critical lift, what should the lift plan establish?
A. Only the operator's name
B. Only the estimated duration of the lift
,C. Load weight, dimensions, center of gravity, crane configuration,
radius, ground conditions, and hazards
D. Only the communication method
A comprehensive lift plan addresses the technical and environmental
factors that can affect crane stability, capacity, and safe load handling.
6. What is the primary function of a crane's outrigger system?
A. To increase engine speed
B. To reduce boom length
C. To increase stability by distributing loads over a larger support area
D. To increase hook speed
Outriggers extend the crane's supporting footprint and transfer forces
into the ground, improving stability when properly deployed.
7. Why must crane outriggers be placed on suitable blocking or
cribbing when required?
A. To make the crane easier to transport
B. To reduce hydraulic pressure
C. To distribute outrigger loads and prevent excessive ground
penetration or settlement
D. To increase the crane's rated load automatically
Proper cribbing spreads concentrated outrigger forces over a larger area
and helps prevent unstable settlement of the supporting surface.
8. What should an operator do if ground conditions appear
inadequate for the planned crane setup?
, A. Increase the load slightly to test the ground
B. Operate at maximum boom length
C. Stop setup and have the ground-support condition evaluated and
corrected before lifting
D. Retract the outriggers halfway
Unstable or inadequate ground can cause crane settlement or
overturning, so lifting should not proceed until suitable support is
established.
9. What is the purpose of a crane's anti-two-block device?
A. To prevent the crane from moving while loaded
B. To prevent excessive counterweight movement
C. To help prevent the hook block or overhaul ball from contacting the
boom tip or upper block
D. To prevent the load from rotating
Two-blocking can damage hoist components and cause rope failure, so
an anti-two-block system provides important protection against this
condition.
10. What is two-blocking?
A. Connecting two cranes together
B. Using two signal persons simultaneously
C. Contact between the load block or overhaul ball and the upper block
or boom tip
D. Lifting two loads with one sling
Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2027 Q&A| Instant
Download Pdf.
1. Which condition is most important to verify before placing a mobile
crane into service on a construction site?
A. The operator has completed the daily paperwork only
B. The crane's rated capacity exceeds the weight of the operator
C. The crane is inspected, properly configured, and suitable for the
planned lift
D. The crane has operated successfully on the previous project
A crane must be inspected and confirmed suitable for the intended lift,
including configuration, capacity, ground conditions, and operating
environment.
2. What is the primary purpose of a crane load chart?
A. To determine the crane's fuel consumption
B. To establish the operator's maximum working hours
C. To identify allowable lifting capacities for specific crane configurations
and conditions
D. To determine the required number of signal persons
,A load chart establishes the crane's rated capacity based on factors such
as boom length, radius, configuration, and counterweight arrangement.
3. When determining crane capacity, what does load radius generally
mean?
A. The distance between the crane wheels
B. The length of the boom
C. The height of the hook above the ground
D. The horizontal distance from the crane's center of rotation to the
load's center of gravity or load line
Load radius is a critical capacity factor because crane lifting capacity
generally decreases as the horizontal distance from the center of
rotation increases.
4. What is the most significant reason that crane capacity may
decrease as the boom is extended?
A. The engine becomes louder
B. The crane becomes easier to steer
C. The increased radius and leverage increase overturning forces
D. The hydraulic oil becomes heavier
Extending the boom can increase operating radius and overturning
moment, reducing the crane's permissible lifting capacity.
5. Before making a critical lift, what should the lift plan establish?
A. Only the operator's name
B. Only the estimated duration of the lift
,C. Load weight, dimensions, center of gravity, crane configuration,
radius, ground conditions, and hazards
D. Only the communication method
A comprehensive lift plan addresses the technical and environmental
factors that can affect crane stability, capacity, and safe load handling.
6. What is the primary function of a crane's outrigger system?
A. To increase engine speed
B. To reduce boom length
C. To increase stability by distributing loads over a larger support area
D. To increase hook speed
Outriggers extend the crane's supporting footprint and transfer forces
into the ground, improving stability when properly deployed.
7. Why must crane outriggers be placed on suitable blocking or
cribbing when required?
A. To make the crane easier to transport
B. To reduce hydraulic pressure
C. To distribute outrigger loads and prevent excessive ground
penetration or settlement
D. To increase the crane's rated load automatically
Proper cribbing spreads concentrated outrigger forces over a larger area
and helps prevent unstable settlement of the supporting surface.
8. What should an operator do if ground conditions appear
inadequate for the planned crane setup?
, A. Increase the load slightly to test the ground
B. Operate at maximum boom length
C. Stop setup and have the ground-support condition evaluated and
corrected before lifting
D. Retract the outriggers halfway
Unstable or inadequate ground can cause crane settlement or
overturning, so lifting should not proceed until suitable support is
established.
9. What is the purpose of a crane's anti-two-block device?
A. To prevent the crane from moving while loaded
B. To prevent excessive counterweight movement
C. To help prevent the hook block or overhaul ball from contacting the
boom tip or upper block
D. To prevent the load from rotating
Two-blocking can damage hoist components and cause rope failure, so
an anti-two-block system provides important protection against this
condition.
10. What is two-blocking?
A. Connecting two cranes together
B. Using two signal persons simultaneously
C. Contact between the load block or overhaul ball and the upper block
or boom tip
D. Lifting two loads with one sling
