NCCCO Digger Derrick Operator Exam
With Actual Questions & Verified
Answers, Plus Explained
Rationales/Expert Verified For
Guaranteed Pass 2026/Latest
Updated/Instant Download Pdf
1. What is the primary purpose of a digger derrick?
A) Lifting heavy steel beams
B) Drilling holes and setting poles
C) Excavating large areas
D) Transporting materials
B) Drilling holes and setting poles
Rationale: Digger derricks are designed specifically for drilling holes
and setting utility poles, not for general lifting or excavation.
2. Which type of soil condition requires special attention when
operating a digger derrick?
A) Sandy soil
B) Clay soil
C) Rocky soil
D) All of the above
D) All of the above
Rationale: Each soil type affects stability differently. Operators must
adjust technique based on soil condition to prevent tip-overs.
, 3. What does the term "outriggers" refer to on a digger derrick?
A) Hydraulic lifts
B) Stabilizing legs
C) Drill bits
D) Boom attachments
B) Stabilizing legs
Rationale: Outriggers extend from the vehicle to stabilize it during
drilling and lifting operations.
4. Before operating a digger derrick, you should:
A) Check the fuel level only
B) Conduct a pre-operation inspection
C) Start the machine immediately
D) Consult only the operator manual
B) Conduct a pre-operation inspection
Rationale: A thorough pre-operation inspection ensures the machine
is safe and fully operational, reducing the risk of accidents.
5. Which is the safest position for the digger derrick during pole
installation?
A) On a slope
B) Fully supported on outriggers
C) With one outrigger retracted
D) Parked on uneven ground
B) Fully supported on outriggers
Rationale: Proper use of outriggers provides maximum stability and
prevents tip-over hazards.
6. What is the purpose of a load chart?
A) To determine fuel efficiency
B) To identify lifting capacities at various boom positions
, C) To measure soil compaction
D) To schedule maintenance
B) To identify lifting capacities at various boom positions
Rationale: Load charts guide operators on safe lifting limits based on
boom angle, extension, and load weight.
7. Which factor is most critical in preventing digger derrick tip-
overs?
A) Operator experience
B) Weather conditions
C) Proper outrigger placement and leveling
D) Fuel type
C) Proper outrigger placement and leveling
Rationale: Stability is primarily achieved through correct outrigger
deployment and leveling, regardless of experience.
8. When drilling a hole, the digger derrick auger should be operated
at:
A) Maximum speed for all soils
B) Controlled speed appropriate to soil type
C) Only with reverse rotation
D) Intermittent short bursts only
B) Controlled speed appropriate to soil type
Rationale: Different soil conditions require adjusted speeds to avoid
equipment damage or unsafe drilling.
9. Which PPE is required when operating a digger derrick?
A) Hard hat, safety glasses, gloves
B) Only steel-toed boots
C) Hearing protection only
D) No PPE required
, A) Hard hat, safety glasses, gloves
Rationale: Standard PPE protects operators from falling objects,
debris, and equipment hazards.
10. What is the function of the boom on a digger derrick?
A) Stabilizing the vehicle
B) Drilling and lifting loads
C) Steering the vehicle
D) Operating the outriggers
B) Drilling and lifting loads
Rationale: The boom provides reach and lifting capacity for poles and
other loads.
11. How should an operator respond if the digger derrick begins
to tip?
A) Increase boom extension
B) Retract outriggers
C) Stop operations immediately and lower the boom
D) Continue drilling
C) Stop operations immediately and lower the boom
Rationale: Halting operations and lowering the boom reduces risk of a
tip-over.
12. Which is the primary hazard when working near overhead
power lines?
A) Tip-over
B) Electrocution
C) Soil collapse
D) Equipment wear
With Actual Questions & Verified
Answers, Plus Explained
Rationales/Expert Verified For
Guaranteed Pass 2026/Latest
Updated/Instant Download Pdf
1. What is the primary purpose of a digger derrick?
A) Lifting heavy steel beams
B) Drilling holes and setting poles
C) Excavating large areas
D) Transporting materials
B) Drilling holes and setting poles
Rationale: Digger derricks are designed specifically for drilling holes
and setting utility poles, not for general lifting or excavation.
2. Which type of soil condition requires special attention when
operating a digger derrick?
A) Sandy soil
B) Clay soil
C) Rocky soil
D) All of the above
D) All of the above
Rationale: Each soil type affects stability differently. Operators must
adjust technique based on soil condition to prevent tip-overs.
, 3. What does the term "outriggers" refer to on a digger derrick?
A) Hydraulic lifts
B) Stabilizing legs
C) Drill bits
D) Boom attachments
B) Stabilizing legs
Rationale: Outriggers extend from the vehicle to stabilize it during
drilling and lifting operations.
4. Before operating a digger derrick, you should:
A) Check the fuel level only
B) Conduct a pre-operation inspection
C) Start the machine immediately
D) Consult only the operator manual
B) Conduct a pre-operation inspection
Rationale: A thorough pre-operation inspection ensures the machine
is safe and fully operational, reducing the risk of accidents.
5. Which is the safest position for the digger derrick during pole
installation?
A) On a slope
B) Fully supported on outriggers
C) With one outrigger retracted
D) Parked on uneven ground
B) Fully supported on outriggers
Rationale: Proper use of outriggers provides maximum stability and
prevents tip-over hazards.
6. What is the purpose of a load chart?
A) To determine fuel efficiency
B) To identify lifting capacities at various boom positions
, C) To measure soil compaction
D) To schedule maintenance
B) To identify lifting capacities at various boom positions
Rationale: Load charts guide operators on safe lifting limits based on
boom angle, extension, and load weight.
7. Which factor is most critical in preventing digger derrick tip-
overs?
A) Operator experience
B) Weather conditions
C) Proper outrigger placement and leveling
D) Fuel type
C) Proper outrigger placement and leveling
Rationale: Stability is primarily achieved through correct outrigger
deployment and leveling, regardless of experience.
8. When drilling a hole, the digger derrick auger should be operated
at:
A) Maximum speed for all soils
B) Controlled speed appropriate to soil type
C) Only with reverse rotation
D) Intermittent short bursts only
B) Controlled speed appropriate to soil type
Rationale: Different soil conditions require adjusted speeds to avoid
equipment damage or unsafe drilling.
9. Which PPE is required when operating a digger derrick?
A) Hard hat, safety glasses, gloves
B) Only steel-toed boots
C) Hearing protection only
D) No PPE required
, A) Hard hat, safety glasses, gloves
Rationale: Standard PPE protects operators from falling objects,
debris, and equipment hazards.
10. What is the function of the boom on a digger derrick?
A) Stabilizing the vehicle
B) Drilling and lifting loads
C) Steering the vehicle
D) Operating the outriggers
B) Drilling and lifting loads
Rationale: The boom provides reach and lifting capacity for poles and
other loads.
11. How should an operator respond if the digger derrick begins
to tip?
A) Increase boom extension
B) Retract outriggers
C) Stop operations immediately and lower the boom
D) Continue drilling
C) Stop operations immediately and lower the boom
Rationale: Halting operations and lowering the boom reduces risk of a
tip-over.
12. Which is the primary hazard when working near overhead
power lines?
A) Tip-over
B) Electrocution
C) Soil collapse
D) Equipment wear
