NCCCO DIGGER DERRICK OPERATOR
CERTIFICATION EXAM QUESTION AND
CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A
INSTANT DOWNLOAD PDF
1. What is the primary function of a digger derrick?
A. Transporting materials
B. Digging holes and setting poles
C. Lifting personnel only
D. Compacting soil
Rationale: Digger derricks are designed specifically to dig holes and set
utility poles while also handling limited lifting operations.
2. Before operating a digger derrick, the operator must first:
A. Check fuel level only
B. Start the engine
C. Conduct a pre-operational inspection
D. Contact the site supervisor
Rationale: A complete pre-operational inspection ensures the machine is
safe and compliant before use.
3. What component prevents the digger derrick from tipping during
operation?
A. Boom
B. Auger
C. Outriggers
D. Hook block
Rationale: Outriggers provide stability and distribute the load to prevent
tipping.
,4. Load charts for digger derricks indicate:
A. Fuel consumption
B. Maximum allowable loads at given configurations
C. Engine RPM limits
D. Tire pressure requirements
Rationale: Load charts define safe lifting capacities based on boom length,
angle, and radius.
5. When working near energized power lines, minimum approach distances
are established by:
A. Manufacturer
B. Employer policy
C. OSHA/Regulatory standards
D. Operator preference
Rationale: Regulatory standards define minimum approach distances to
prevent electrical hazards.
6. What is the purpose of the auger on a digger derrick?
A. Lift loads
B. Drill holes in the ground
C. Stabilize the truck
D. Power hydraulics
Rationale: The auger is specifically designed to drill holes for poles or
foundations.
7. Ground conditions should be evaluated to ensure:
A. Faster digging
B. Reduced fuel use
C. Adequate support for outriggers
D. Proper auger speed
Rationale: Poor ground conditions can cause outrigger failure and
instability.
8. What must be done if a load exceeds the rated capacity?
A. Lift slowly
B. Use hand signals
C. Do not lift the load
, D. Extend the boom further
Rationale: Lifting beyond rated capacity can cause equipment failure or
tip-over.
9. Who is responsible for determining if conditions are safe to operate?
A. Signal person
B. Site supervisor
C. Operator
D. Utility owner
Rationale: The operator has the final responsibility for safe operation.
10.The center of gravity of a load affects:
A. Engine speed
B. Stability and capacity
C. Hydraulic pressure only
D. Fuel efficiency
Rationale: Load stability and rated capacity depend heavily on center of
gravity.
11.What should be used to protect outriggers on soft ground?
A. Tires
B. Augers
C. Outrigger pads or cribbing
D. Buckets
Rationale: Pads or cribbing distribute weight and prevent sinking.
12.A signal person is required when:
A. Operating at night only
B. Operator’s view is obstructed
C. Lifting light loads
D. Digging holes
Rationale: Signal persons are required when the operator cannot clearly
see the load or work area.
13.Hydraulic system leaks can cause:
A. Improved performance
B. Loss of control and safety hazards
C. Higher capacity
CERTIFICATION EXAM QUESTION AND
CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A
INSTANT DOWNLOAD PDF
1. What is the primary function of a digger derrick?
A. Transporting materials
B. Digging holes and setting poles
C. Lifting personnel only
D. Compacting soil
Rationale: Digger derricks are designed specifically to dig holes and set
utility poles while also handling limited lifting operations.
2. Before operating a digger derrick, the operator must first:
A. Check fuel level only
B. Start the engine
C. Conduct a pre-operational inspection
D. Contact the site supervisor
Rationale: A complete pre-operational inspection ensures the machine is
safe and compliant before use.
3. What component prevents the digger derrick from tipping during
operation?
A. Boom
B. Auger
C. Outriggers
D. Hook block
Rationale: Outriggers provide stability and distribute the load to prevent
tipping.
,4. Load charts for digger derricks indicate:
A. Fuel consumption
B. Maximum allowable loads at given configurations
C. Engine RPM limits
D. Tire pressure requirements
Rationale: Load charts define safe lifting capacities based on boom length,
angle, and radius.
5. When working near energized power lines, minimum approach distances
are established by:
A. Manufacturer
B. Employer policy
C. OSHA/Regulatory standards
D. Operator preference
Rationale: Regulatory standards define minimum approach distances to
prevent electrical hazards.
6. What is the purpose of the auger on a digger derrick?
A. Lift loads
B. Drill holes in the ground
C. Stabilize the truck
D. Power hydraulics
Rationale: The auger is specifically designed to drill holes for poles or
foundations.
7. Ground conditions should be evaluated to ensure:
A. Faster digging
B. Reduced fuel use
C. Adequate support for outriggers
D. Proper auger speed
Rationale: Poor ground conditions can cause outrigger failure and
instability.
8. What must be done if a load exceeds the rated capacity?
A. Lift slowly
B. Use hand signals
C. Do not lift the load
, D. Extend the boom further
Rationale: Lifting beyond rated capacity can cause equipment failure or
tip-over.
9. Who is responsible for determining if conditions are safe to operate?
A. Signal person
B. Site supervisor
C. Operator
D. Utility owner
Rationale: The operator has the final responsibility for safe operation.
10.The center of gravity of a load affects:
A. Engine speed
B. Stability and capacity
C. Hydraulic pressure only
D. Fuel efficiency
Rationale: Load stability and rated capacity depend heavily on center of
gravity.
11.What should be used to protect outriggers on soft ground?
A. Tires
B. Augers
C. Outrigger pads or cribbing
D. Buckets
Rationale: Pads or cribbing distribute weight and prevent sinking.
12.A signal person is required when:
A. Operating at night only
B. Operator’s view is obstructed
C. Lifting light loads
D. Digging holes
Rationale: Signal persons are required when the operator cannot clearly
see the load or work area.
13.Hydraulic system leaks can cause:
A. Improved performance
B. Loss of control and safety hazards
C. Higher capacity
