NCCCO Digger Derrick Rigging
Practice Exam Fall 2026| 250
Most Tested Questions
Collection & Verified Detailed
Answers With Rationales|
Tutor Verified Success Exam)
Graded A+
1. What is the primary purpose of a sling when handling a load
with a digger derrick?
A. Increase engine power
B. Connect the load to the lifting device
C. Reduce boom length
D. Control hydraulic pressure
Rationale: A sling provides the connection between the load
and the lifting apparatus.
2. Before using a wire-rope sling, the operator should first:
A. Lubricate it heavily
B. Increase the load radius
C. Inspect it for damage and defects
D. Place it in a basket hitch
Rationale: Inspection is required to identify conditions that
could make the sling unsafe.
,3. Which sling configuration generally provides the greatest load-
control advantage when properly applied?
A. Single vertical hitch
B. Basket hitch
C. Choker with no load contact
D. Single-leg bridle with one leg unloaded
Rationale: A properly configured basket hitch can provide
greater capacity than a single vertical leg, subject to the sling
manufacturer's limits.
4. What happens to sling tension as the angle between sling legs
becomes smaller from horizontal?
A. Tension decreases
B. Tension remains unchanged
C. Tension increases
D. Tension becomes zero
Rationale: Shallower sling angles produce higher tension in
each sling leg.
5. A sling should be removed from service when it has:
A. Normal identification markings
B. Proper end fittings
C. Severe damage or an unsafe defect
D. A clean surface
Rationale: Damaged rigging must not remain in service when its
condition could compromise safe lifting.
6. What information is especially important when selecting a
sling?
A. Paint color
B. Operator's preference
C. Rated capacity for the intended hitch and configuration
D. Truck tire size
Rationale: Sling capacity depends on the sling type, size, hitch,
angle, and configuration.
,7. What is the purpose of a sling identification tag?
A. Identify the operator
B. Provide information such as rated capacity and sling
characteristics
C. Increase sling capacity
D. Replace inspection requirements
Rationale: Identification information helps the rigger select and
use the sling correctly.
8. Which condition can damage synthetic web slings?
A. Smooth rounded edges
B. Sharp edges without adequate protection
C. Proper padding
D. Correct storage
Rationale: Sharp edges can cut or severely abrade synthetic
sling material.
9. What should be placed between a synthetic sling and a sharp
load edge?
A. Loose wire
B. Hydraulic hose
C. Suitable edge protection
D. Chain lubricant
Rationale: Edge protection helps prevent cutting and abrasion
of the sling.
10. What is the primary concern when using a choker hitch?
A. The boom becomes shorter
B. The hitch can reduce sling capacity compared with a vertical
hitch
C. The load becomes weightless
D. The sling becomes self-inspecting
Rationale: Choker configurations have specific capacity
reductions that must be considered.
, 11. A shackle should be selected based primarily on its:
A. Color
B. Weight alone
C. Rated capacity and intended application
D. Manufacturer's logo size
Rationale: Shackles must have adequate rated capacity for the
load and configuration.
12. What component normally connects a shackle to a lifting
sling?
A. Tire chain
B. Shackle pin
C. Hydraulic cylinder
D. Boom stop
Rationale: The shackle pin secures the shackle body around the
connected rigging.
13. Before lifting, a shackle pin should be:
A. Removed
B. Welded permanently
C. Properly installed and secured according to the
manufacturer's instructions
D. Replaced with rope
Rationale: Correct pin installation is essential to maintaining the
shackle's intended strength.
14. Why should a load be centered beneath the lifting point
when practical?
A. To increase wind speed
B. To minimize unintended side loading and swinging
C. To increase boom deflection
D. To eliminate inspection
Rationale: Centering the load promotes balanced loading and
better control.
Practice Exam Fall 2026| 250
Most Tested Questions
Collection & Verified Detailed
Answers With Rationales|
Tutor Verified Success Exam)
Graded A+
1. What is the primary purpose of a sling when handling a load
with a digger derrick?
A. Increase engine power
B. Connect the load to the lifting device
C. Reduce boom length
D. Control hydraulic pressure
Rationale: A sling provides the connection between the load
and the lifting apparatus.
2. Before using a wire-rope sling, the operator should first:
A. Lubricate it heavily
B. Increase the load radius
C. Inspect it for damage and defects
D. Place it in a basket hitch
Rationale: Inspection is required to identify conditions that
could make the sling unsafe.
,3. Which sling configuration generally provides the greatest load-
control advantage when properly applied?
A. Single vertical hitch
B. Basket hitch
C. Choker with no load contact
D. Single-leg bridle with one leg unloaded
Rationale: A properly configured basket hitch can provide
greater capacity than a single vertical leg, subject to the sling
manufacturer's limits.
4. What happens to sling tension as the angle between sling legs
becomes smaller from horizontal?
A. Tension decreases
B. Tension remains unchanged
C. Tension increases
D. Tension becomes zero
Rationale: Shallower sling angles produce higher tension in
each sling leg.
5. A sling should be removed from service when it has:
A. Normal identification markings
B. Proper end fittings
C. Severe damage or an unsafe defect
D. A clean surface
Rationale: Damaged rigging must not remain in service when its
condition could compromise safe lifting.
6. What information is especially important when selecting a
sling?
A. Paint color
B. Operator's preference
C. Rated capacity for the intended hitch and configuration
D. Truck tire size
Rationale: Sling capacity depends on the sling type, size, hitch,
angle, and configuration.
,7. What is the purpose of a sling identification tag?
A. Identify the operator
B. Provide information such as rated capacity and sling
characteristics
C. Increase sling capacity
D. Replace inspection requirements
Rationale: Identification information helps the rigger select and
use the sling correctly.
8. Which condition can damage synthetic web slings?
A. Smooth rounded edges
B. Sharp edges without adequate protection
C. Proper padding
D. Correct storage
Rationale: Sharp edges can cut or severely abrade synthetic
sling material.
9. What should be placed between a synthetic sling and a sharp
load edge?
A. Loose wire
B. Hydraulic hose
C. Suitable edge protection
D. Chain lubricant
Rationale: Edge protection helps prevent cutting and abrasion
of the sling.
10. What is the primary concern when using a choker hitch?
A. The boom becomes shorter
B. The hitch can reduce sling capacity compared with a vertical
hitch
C. The load becomes weightless
D. The sling becomes self-inspecting
Rationale: Choker configurations have specific capacity
reductions that must be considered.
, 11. A shackle should be selected based primarily on its:
A. Color
B. Weight alone
C. Rated capacity and intended application
D. Manufacturer's logo size
Rationale: Shackles must have adequate rated capacity for the
load and configuration.
12. What component normally connects a shackle to a lifting
sling?
A. Tire chain
B. Shackle pin
C. Hydraulic cylinder
D. Boom stop
Rationale: The shackle pin secures the shackle body around the
connected rigging.
13. Before lifting, a shackle pin should be:
A. Removed
B. Welded permanently
C. Properly installed and secured according to the
manufacturer's instructions
D. Replaced with rope
Rationale: Correct pin installation is essential to maintaining the
shackle's intended strength.
14. Why should a load be centered beneath the lifting point
when practical?
A. To increase wind speed
B. To minimize unintended side loading and swinging
C. To increase boom deflection
D. To eliminate inspection
Rationale: Centering the load promotes balanced loading and
better control.
