NCCCO Digger Derrick Operator Practice Exam
Questions With Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
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1. What is the primary purpose of a digger derrick?
A. Lifting personnel only
B. Excavating trenches
C. Digging holes and setting poles
D. Transporting materials
Answer: C
Rationale: A digger derrick is specifically designed for drilling
holes and setting poles, particularly in utility work such as power
line installation.
2. What document provides critical load limits for a digger derrick?
A. Maintenance log
B. Operator’s manual and load chart
C. Work schedule
, D. Inspection checklist
Answer: B
Rationale: The operator’s manual and load chart provide
essential information about the equipment’s rated capacities
and safe operation limits.
3. What must be done before operating a digger derrick?
A. Check fuel only
B. Conduct a pre-operation inspection
C. Start the engine immediately
D. Notify supervisor only
Answer: B
Rationale: A pre-operation inspection ensures all components
are functioning properly and safely before use.
4. What is the main hazard when working near power lines?
A. Noise exposure
B. Electrocution
C. Slips and falls
D. Equipment overheating
Answer: B
, Rationale: Contact with energized lines can result in severe injury
or death due to electrocution.
5. What does “radius” refer to in load charts?
A. Height of the boom
B. Distance from the center of rotation to the load
C. Length of the auger
D. Weight of the load
Answer: B
Rationale: Radius is the horizontal distance from the crane’s
center of rotation to the load and directly affects capacity.
6. What is the function of outriggers?
A. Increase engine power
B. Improve visibility
C. Stabilize the equipment
D. Lift the load
Answer: C
Rationale: Outriggers provide stability by distributing weight and
preventing tipping.
, 7. When should outriggers be fully extended?
A. Only when lifting heavy loads
B. Whenever possible during operations
C. Only on uneven ground
D. Never
Answer: B
Rationale: Fully extended outriggers maximize stability and
lifting capacity.
8. What is a common cause of equipment tipping?
A. Low fuel
B. Overloading
C. Clean controls
D. Proper setup
Answer: B
Rationale: Exceeding rated capacity can destabilize the
equipment, leading to tipping.
9. What should be used under outriggers on soft ground?
A. Metal sheets
B. Outrigger pads
Questions With Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of a digger derrick?
A. Lifting personnel only
B. Excavating trenches
C. Digging holes and setting poles
D. Transporting materials
Answer: C
Rationale: A digger derrick is specifically designed for drilling
holes and setting poles, particularly in utility work such as power
line installation.
2. What document provides critical load limits for a digger derrick?
A. Maintenance log
B. Operator’s manual and load chart
C. Work schedule
, D. Inspection checklist
Answer: B
Rationale: The operator’s manual and load chart provide
essential information about the equipment’s rated capacities
and safe operation limits.
3. What must be done before operating a digger derrick?
A. Check fuel only
B. Conduct a pre-operation inspection
C. Start the engine immediately
D. Notify supervisor only
Answer: B
Rationale: A pre-operation inspection ensures all components
are functioning properly and safely before use.
4. What is the main hazard when working near power lines?
A. Noise exposure
B. Electrocution
C. Slips and falls
D. Equipment overheating
Answer: B
, Rationale: Contact with energized lines can result in severe injury
or death due to electrocution.
5. What does “radius” refer to in load charts?
A. Height of the boom
B. Distance from the center of rotation to the load
C. Length of the auger
D. Weight of the load
Answer: B
Rationale: Radius is the horizontal distance from the crane’s
center of rotation to the load and directly affects capacity.
6. What is the function of outriggers?
A. Increase engine power
B. Improve visibility
C. Stabilize the equipment
D. Lift the load
Answer: C
Rationale: Outriggers provide stability by distributing weight and
preventing tipping.
, 7. When should outriggers be fully extended?
A. Only when lifting heavy loads
B. Whenever possible during operations
C. Only on uneven ground
D. Never
Answer: B
Rationale: Fully extended outriggers maximize stability and
lifting capacity.
8. What is a common cause of equipment tipping?
A. Low fuel
B. Overloading
C. Clean controls
D. Proper setup
Answer: B
Rationale: Exceeding rated capacity can destabilize the
equipment, leading to tipping.
9. What should be used under outriggers on soft ground?
A. Metal sheets
B. Outrigger pads
