NCCCO Digger Derrick Operator Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of a digger derrick?
A. Transporting personnel
B. Digging post holes and lifting loads
C. Paving roads
D. Trenching underground utilities
B. Digging post holes and lifting loads
Rationale: Digger derricks are designed for digging holes for poles
and lifting materials, such as utility poles.
2. Which component stabilizes a digger derrick during operation?
A. Winch
B. Outriggers
C. Boom tip
D. Bucket
, B. Outriggers
Rationale: Outriggers extend from the chassis to provide stability and
prevent tipping during digging and lifting operations.
3. When should a pre-operation inspection be performed?
A. Once a month
B. Before each shift
C. Only after maintenance
D. Annually
B. Before each shift
Rationale: A pre-operation inspection is essential before every use to
identify hazards, defects, and ensure safe operation.
4. What does the load chart indicate?
A. Engine type
B. Maximum lifting capacities at different boom positions
C. Fuel consumption
D. Tire pressure
B. Maximum lifting capacities at different boom positions
Rationale: The load chart provides safe lifting limits based on boom
length, angle, and outrigger configuration.
5. What is the primary hazard when operating a digger derrick near
power lines?
A. Falling debris
B. Electrical contact
, C. Tire punctures
D. Engine overheating
B. Electrical contact
Rationale: Digger derricks often work near energized lines, and
contact can cause electrocution.
6. How should outriggers be positioned on uneven terrain?
A. Only partially extended
B. Fully extended and leveled
C. Not used
D. Extended on one side only
B. Fully extended and leveled
Rationale: Fully extending and leveling outriggers stabilizes the
vehicle and prevents tipping.
7. What is the correct procedure for lowering a loaded boom?
A. Rapidly release hydraulic pressure
B. Use slow, controlled movements
C. Release the load manually
D. Detach outriggers
B. Use slow, controlled movements
Rationale: Controlled movements prevent load swing and equipment
damage.
8. What is the main function of a hydraulic system in a digger derrick?
A. Cooling the engine
, B. Transmitting power to lift and extend the boom
C. Steering the tires
D. Inflating the outriggers
B. Transmitting power to lift and extend the boom
Rationale: Hydraulics convert fluid pressure into mechanical
movement for boom operations.
9. How often should outriggers be inspected?
A. Only after an accident
B. Daily or before each operation
C. Annually
D. Weekly
B. Daily or before each operation
Rationale: Inspecting outriggers daily ensures proper function and
prevents equipment failure.
10. Which personal protective equipment (PPE) is required when
operating a digger derrick?
A. Sunglasses
B. Hard hat, gloves, and safety boots
C. Casual clothing
D. Earbuds
B. Hard hat, gloves, and safety boots
Rationale: PPE protects operators from falling objects, pinch points,
and other hazards.
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of a digger derrick?
A. Transporting personnel
B. Digging post holes and lifting loads
C. Paving roads
D. Trenching underground utilities
B. Digging post holes and lifting loads
Rationale: Digger derricks are designed for digging holes for poles
and lifting materials, such as utility poles.
2. Which component stabilizes a digger derrick during operation?
A. Winch
B. Outriggers
C. Boom tip
D. Bucket
, B. Outriggers
Rationale: Outriggers extend from the chassis to provide stability and
prevent tipping during digging and lifting operations.
3. When should a pre-operation inspection be performed?
A. Once a month
B. Before each shift
C. Only after maintenance
D. Annually
B. Before each shift
Rationale: A pre-operation inspection is essential before every use to
identify hazards, defects, and ensure safe operation.
4. What does the load chart indicate?
A. Engine type
B. Maximum lifting capacities at different boom positions
C. Fuel consumption
D. Tire pressure
B. Maximum lifting capacities at different boom positions
Rationale: The load chart provides safe lifting limits based on boom
length, angle, and outrigger configuration.
5. What is the primary hazard when operating a digger derrick near
power lines?
A. Falling debris
B. Electrical contact
, C. Tire punctures
D. Engine overheating
B. Electrical contact
Rationale: Digger derricks often work near energized lines, and
contact can cause electrocution.
6. How should outriggers be positioned on uneven terrain?
A. Only partially extended
B. Fully extended and leveled
C. Not used
D. Extended on one side only
B. Fully extended and leveled
Rationale: Fully extending and leveling outriggers stabilizes the
vehicle and prevents tipping.
7. What is the correct procedure for lowering a loaded boom?
A. Rapidly release hydraulic pressure
B. Use slow, controlled movements
C. Release the load manually
D. Detach outriggers
B. Use slow, controlled movements
Rationale: Controlled movements prevent load swing and equipment
damage.
8. What is the main function of a hydraulic system in a digger derrick?
A. Cooling the engine
, B. Transmitting power to lift and extend the boom
C. Steering the tires
D. Inflating the outriggers
B. Transmitting power to lift and extend the boom
Rationale: Hydraulics convert fluid pressure into mechanical
movement for boom operations.
9. How often should outriggers be inspected?
A. Only after an accident
B. Daily or before each operation
C. Annually
D. Weekly
B. Daily or before each operation
Rationale: Inspecting outriggers daily ensures proper function and
prevents equipment failure.
10. Which personal protective equipment (PPE) is required when
operating a digger derrick?
A. Sunglasses
B. Hard hat, gloves, and safety boots
C. Casual clothing
D. Earbuds
B. Hard hat, gloves, and safety boots
Rationale: PPE protects operators from falling objects, pinch points,
and other hazards.
