NCCCO Digger Derrick Operator Practice
Exam 2026-2027- 100- Questions And
Correct Detailed Answers Questions From
Real Exams Already Graded A+
Exams of Engineering – Operator Certification
Content Covered
• Load charts and capacity calculations
• Digger derrick setup and stability
• Ground conditions and outrigger use
• Rigging fundamentals
• Hoisting and lifting operations
• Power line safety (OSHA & NCCCO standards)
• Digger derrick components and controls
• Site hazards and operational planning
1. What is the primary purpose of the load chart on a digger derrick?
A. To determine boom speed
B. To identify maximum safe lifting capacities
C. To show fuel consumption
D. To calculate digging depth
The load chart defines allowable loads based on boom length, radius, and
configuration.
,2. Which factor has the greatest effect on a digger derrick’s lifting capacity?
A. Engine horsepower
B. Wind speed
C. Operating radius
D. Tire pressure
As the operating radius increases, lifting capacity decreases significantly.
3. Before lifting a load, the operator must first ensure that:
A. The engine is fully warmed
B. The boom angle is minimal
C. Outriggers are properly deployed and set
D. The hook block is centered
Proper outrigger setup is essential for stability and safe operation.
4. When working near energized power lines, minimum approach distances
are established by:
A. ANSI B30 standards
B. Manufacturer guidelines
C. OSHA regulations
D. State traffic laws
OSHA specifies minimum clearance distances to prevent electrical contact.
5. A digger derrick is considered out of level when it exceeds:
A. 0.5 degrees
B. 1 degree
C. Manufacturer-specified limits
D. 5 degrees
Each manufacturer specifies allowable level tolerances.
6. What is the main purpose of cribbing under outriggers?
A. To reduce noise
B. To distribute the load over a larger area
C. To increase lifting height
D. To prevent corrosion
Cribbing reduces ground pressure and prevents sinking.
, 7. Which ground condition presents the greatest risk of outrigger failure?
A. Compacted gravel
B. Dry clay
C. Recently backfilled soil
D. Concrete pavement
Backfilled soil may not be compacted and can collapse under load.
8. The rated capacity of a digger derrick is based on:
A. Structural strength only
B. Hydraulic pressure
C. Stability and structural limitations
D. Operator skill
Capacity is limited by both tipping and structural limits.
9. Which component prevents overloading during lifting operations?
A. Boom hoist cylinder
B. Load block
C. Load moment indicator (LMI)
D. Hydraulic pump
The LMI warns the operator when approaching rated limits.
10.If the LMI fails during operation, the operator should:
A. Continue cautiously
B. Reduce speed
C. Stop operations immediately
D. Switch to manual mode
Operating without a functioning LMI is unsafe and prohibited.
11.What is the primary hazard when hoisting personnel with a digger derrick?
A. Hydraulic overheating
B. Electrical contact
C. Load swing
D. Reduced visibility
Personnel lifts increase exposure to electrical hazards.
Exam 2026-2027- 100- Questions And
Correct Detailed Answers Questions From
Real Exams Already Graded A+
Exams of Engineering – Operator Certification
Content Covered
• Load charts and capacity calculations
• Digger derrick setup and stability
• Ground conditions and outrigger use
• Rigging fundamentals
• Hoisting and lifting operations
• Power line safety (OSHA & NCCCO standards)
• Digger derrick components and controls
• Site hazards and operational planning
1. What is the primary purpose of the load chart on a digger derrick?
A. To determine boom speed
B. To identify maximum safe lifting capacities
C. To show fuel consumption
D. To calculate digging depth
The load chart defines allowable loads based on boom length, radius, and
configuration.
,2. Which factor has the greatest effect on a digger derrick’s lifting capacity?
A. Engine horsepower
B. Wind speed
C. Operating radius
D. Tire pressure
As the operating radius increases, lifting capacity decreases significantly.
3. Before lifting a load, the operator must first ensure that:
A. The engine is fully warmed
B. The boom angle is minimal
C. Outriggers are properly deployed and set
D. The hook block is centered
Proper outrigger setup is essential for stability and safe operation.
4. When working near energized power lines, minimum approach distances
are established by:
A. ANSI B30 standards
B. Manufacturer guidelines
C. OSHA regulations
D. State traffic laws
OSHA specifies minimum clearance distances to prevent electrical contact.
5. A digger derrick is considered out of level when it exceeds:
A. 0.5 degrees
B. 1 degree
C. Manufacturer-specified limits
D. 5 degrees
Each manufacturer specifies allowable level tolerances.
6. What is the main purpose of cribbing under outriggers?
A. To reduce noise
B. To distribute the load over a larger area
C. To increase lifting height
D. To prevent corrosion
Cribbing reduces ground pressure and prevents sinking.
, 7. Which ground condition presents the greatest risk of outrigger failure?
A. Compacted gravel
B. Dry clay
C. Recently backfilled soil
D. Concrete pavement
Backfilled soil may not be compacted and can collapse under load.
8. The rated capacity of a digger derrick is based on:
A. Structural strength only
B. Hydraulic pressure
C. Stability and structural limitations
D. Operator skill
Capacity is limited by both tipping and structural limits.
9. Which component prevents overloading during lifting operations?
A. Boom hoist cylinder
B. Load block
C. Load moment indicator (LMI)
D. Hydraulic pump
The LMI warns the operator when approaching rated limits.
10.If the LMI fails during operation, the operator should:
A. Continue cautiously
B. Reduce speed
C. Stop operations immediately
D. Switch to manual mode
Operating without a functioning LMI is unsafe and prohibited.
11.What is the primary hazard when hoisting personnel with a digger derrick?
A. Hydraulic overheating
B. Electrical contact
C. Load swing
D. Reduced visibility
Personnel lifts increase exposure to electrical hazards.
