NCCCO MOBILE CRANE EXAM 2026/2027 | 150
Questions | Verified Answers | Grade A | Pass
Guaranteed - A+ Graded
SECTION 1: Crane Setup & Site Assessment (Q1–Q20)
Q1: A mobile crane is being set up on compacted gravel. According to ASME B30.5,
what is the minimum acceptable ground bearing pressure capacity before placing
outrigger pads or cribbing?
A. 2,000 psf
B. 3,000 psf
C. 3,500 psf [CORRECT]
D. 5,000 psf
Correct Answer: C
Rationale: ASME B30.5 requires a minimum ground bearing capacity of 3,500 psf for
standard mobile crane setup; options A and B are below the threshold and option D
exceeds typical minimums but is not the standard requirement. The ground must be
firm, drained, and graded to support the crane without settling.
Q2: During site assessment, the operator discovers underground utilities marked at the
proposed outrigger location. What is the required action per OSHA 1926.1408?
A. Proceed with setup if utilities are deeper than 3 feet
B. Contact the utility owner and ensure safe clearance before setup [CORRECT]
C. Use thicker cribbing to distribute load over utilities
D. Relocate the crane to another site without notifying anyone
Correct Answer: B
Rationale: OSHA 1926.1408 requires operators to contact utility owners and ensure safe
clearances before setting up near underground utilities; simply adding cribbing or
,guessing depths does not satisfy the standard, and relocating without notice violates
communication requirements.
Q3: When positioning a mobile crane on outriggers, what is the maximum allowable
slope for the crane to be considered "level" per NCCCO standards?
A. 0.5%
B. 1% [CORRECT]
C. 2%
D. 3%
Correct Answer: B
Rationale: NCCCO and manufacturer standards require the crane to be within 1% of level
for safe operation; exceeding 1% significantly affects load chart accuracy and stability,
making options C and D unsafe and option A unnecessarily restrictive.
Q4: On a crawler crane, the tipping axis is determined by the alignment of which
components?
A. The boom base and boom tip
B. The idler and sprocket [CORRECT]
C. The counterweight and cab
D. The track rollers and top carrier
Correct Answer: B
Rationale: On crawler cranes, the tipping axis is determined by the idler and sprocket
alignment; this defines the stability baseline, while the other options describe structural
components that do not establish the tipping plane.
Q5: What is the correct sequence for assembling a mobile crane with removable
counterweights?
A. Raise boom first, then install counterweights
B. Install counterweights before raising the boom [CORRECT]
C. Install counterweights only after load testing
D. Counterweights may be installed in any order
Correct Answer: B
Rationale: ASME B30.5 and manufacturer procedures require counterweights to be
installed before raising the boom to prevent backward tipping; raising the boom first
without counterweight creates an unstable condition.
,Q6: A crane setup requires cribbing under outrigger pads. The cribbing should be
constructed of:
A. Plywood sheets only
B. Material with sufficient strength to withstand crushing and distributed in layers no
larger than the pad [CORRECT]
C. Any available lumber regardless of grade
D. Steel plates only, as wood is prohibited
Correct Answer: B
Rationale: Cribbing must be made of material strong enough to prevent crushing and
should be distributed in layers that do not exceed the pad size to prevent tipping;
plywood alone or ungraded lumber may fail, and wood is not prohibited.
Q7: The operator's manual for a mobile crane must be:
A. Stored in the site office for reference
B. Kept in the crane cab at all times [CORRECT]
C. Left with the maintenance department
D. Memorized by the operator and not required on-site
Correct Answer: B
Rationale: OSHA 1926.1417 and ASME B30.5 require the operator's manual to be
maintained in the crane cab for immediate reference; storing it off-site or expecting
memorization does not meet regulatory requirements.
Q8: A mobile crane's windshield has a crack. Under what condition is this acceptable for
continued operation?
A. Never; any crack requires immediate replacement
B. If the crack is less than 6 inches long
C. If there is no visible distortion that interferes with safe operation [CORRECT]
D. If the operator wears safety glasses
Correct Answer: C
Rationale: OSHA 1926.1417 and manufacturer standards permit windshield cracks
provided there is no visible distortion interfering with safe operation; arbitrary length
limits or safety glasses do not address the visibility hazard.
Q9: Before making a lift, the crane operator must verify that the ground at the outrigger
location can support:
A. Only the crane's gross weight
, B. The crane's weight plus 25% dynamic load factor
C. The crane's load chart capacity at maximum radius
D. The total load including crane weight, load, and rigging at the maximum expected
reaction [CORRECT]
Correct Answer: D
Rationale: The ground must support the total load including crane weight, load, and
rigging at maximum expected outrigger reaction; considering only gross weight or
adding arbitrary percentages does not ensure adequate ground bearing capacity.
Q10: When setting up near a excavation, the crane must maintain a distance from the
edge equal to at least:
A. The depth of the excavation
B. 1.5 times the depth of the excavation
C. The depth of the excavation plus 3 feet
D. At least the depth of the excavation or use a retaining system designed by a qualified
person [CORRECT]
Correct Answer: D
Rationale: OSHA 1926.1402 requires the crane to be at least the depth of the excavation
away from the edge or use a qualified-person-designed retaining system; fixed
multipliers are not universally mandated.
Q11: During a site assessment, the operator notes soft ground conditions. What is the
appropriate response?
A. Use the on-rubber load chart instead of outrigger charts
B. Improve ground conditions or use additional cribbing/matting to distribute load
[CORRECT]
C. Reduce the load by 10% and proceed
D. Increase outrigger extension to maximum and proceed
Correct Answer: B
Rationale: Soft ground requires improved conditions or additional load distribution
through cribbing/matting; switching to on-rubber charts or arbitrary load reductions
does not address ground failure risks.
Q12: The boom angle indicator on a mobile crane must be readable from:
A. The ground near the load
B. The operator's station in the cab [CORRECT]
Questions | Verified Answers | Grade A | Pass
Guaranteed - A+ Graded
SECTION 1: Crane Setup & Site Assessment (Q1–Q20)
Q1: A mobile crane is being set up on compacted gravel. According to ASME B30.5,
what is the minimum acceptable ground bearing pressure capacity before placing
outrigger pads or cribbing?
A. 2,000 psf
B. 3,000 psf
C. 3,500 psf [CORRECT]
D. 5,000 psf
Correct Answer: C
Rationale: ASME B30.5 requires a minimum ground bearing capacity of 3,500 psf for
standard mobile crane setup; options A and B are below the threshold and option D
exceeds typical minimums but is not the standard requirement. The ground must be
firm, drained, and graded to support the crane without settling.
Q2: During site assessment, the operator discovers underground utilities marked at the
proposed outrigger location. What is the required action per OSHA 1926.1408?
A. Proceed with setup if utilities are deeper than 3 feet
B. Contact the utility owner and ensure safe clearance before setup [CORRECT]
C. Use thicker cribbing to distribute load over utilities
D. Relocate the crane to another site without notifying anyone
Correct Answer: B
Rationale: OSHA 1926.1408 requires operators to contact utility owners and ensure safe
clearances before setting up near underground utilities; simply adding cribbing or
,guessing depths does not satisfy the standard, and relocating without notice violates
communication requirements.
Q3: When positioning a mobile crane on outriggers, what is the maximum allowable
slope for the crane to be considered "level" per NCCCO standards?
A. 0.5%
B. 1% [CORRECT]
C. 2%
D. 3%
Correct Answer: B
Rationale: NCCCO and manufacturer standards require the crane to be within 1% of level
for safe operation; exceeding 1% significantly affects load chart accuracy and stability,
making options C and D unsafe and option A unnecessarily restrictive.
Q4: On a crawler crane, the tipping axis is determined by the alignment of which
components?
A. The boom base and boom tip
B. The idler and sprocket [CORRECT]
C. The counterweight and cab
D. The track rollers and top carrier
Correct Answer: B
Rationale: On crawler cranes, the tipping axis is determined by the idler and sprocket
alignment; this defines the stability baseline, while the other options describe structural
components that do not establish the tipping plane.
Q5: What is the correct sequence for assembling a mobile crane with removable
counterweights?
A. Raise boom first, then install counterweights
B. Install counterweights before raising the boom [CORRECT]
C. Install counterweights only after load testing
D. Counterweights may be installed in any order
Correct Answer: B
Rationale: ASME B30.5 and manufacturer procedures require counterweights to be
installed before raising the boom to prevent backward tipping; raising the boom first
without counterweight creates an unstable condition.
,Q6: A crane setup requires cribbing under outrigger pads. The cribbing should be
constructed of:
A. Plywood sheets only
B. Material with sufficient strength to withstand crushing and distributed in layers no
larger than the pad [CORRECT]
C. Any available lumber regardless of grade
D. Steel plates only, as wood is prohibited
Correct Answer: B
Rationale: Cribbing must be made of material strong enough to prevent crushing and
should be distributed in layers that do not exceed the pad size to prevent tipping;
plywood alone or ungraded lumber may fail, and wood is not prohibited.
Q7: The operator's manual for a mobile crane must be:
A. Stored in the site office for reference
B. Kept in the crane cab at all times [CORRECT]
C. Left with the maintenance department
D. Memorized by the operator and not required on-site
Correct Answer: B
Rationale: OSHA 1926.1417 and ASME B30.5 require the operator's manual to be
maintained in the crane cab for immediate reference; storing it off-site or expecting
memorization does not meet regulatory requirements.
Q8: A mobile crane's windshield has a crack. Under what condition is this acceptable for
continued operation?
A. Never; any crack requires immediate replacement
B. If the crack is less than 6 inches long
C. If there is no visible distortion that interferes with safe operation [CORRECT]
D. If the operator wears safety glasses
Correct Answer: C
Rationale: OSHA 1926.1417 and manufacturer standards permit windshield cracks
provided there is no visible distortion interfering with safe operation; arbitrary length
limits or safety glasses do not address the visibility hazard.
Q9: Before making a lift, the crane operator must verify that the ground at the outrigger
location can support:
A. Only the crane's gross weight
, B. The crane's weight plus 25% dynamic load factor
C. The crane's load chart capacity at maximum radius
D. The total load including crane weight, load, and rigging at the maximum expected
reaction [CORRECT]
Correct Answer: D
Rationale: The ground must support the total load including crane weight, load, and
rigging at maximum expected outrigger reaction; considering only gross weight or
adding arbitrary percentages does not ensure adequate ground bearing capacity.
Q10: When setting up near a excavation, the crane must maintain a distance from the
edge equal to at least:
A. The depth of the excavation
B. 1.5 times the depth of the excavation
C. The depth of the excavation plus 3 feet
D. At least the depth of the excavation or use a retaining system designed by a qualified
person [CORRECT]
Correct Answer: D
Rationale: OSHA 1926.1402 requires the crane to be at least the depth of the excavation
away from the edge or use a qualified-person-designed retaining system; fixed
multipliers are not universally mandated.
Q11: During a site assessment, the operator notes soft ground conditions. What is the
appropriate response?
A. Use the on-rubber load chart instead of outrigger charts
B. Improve ground conditions or use additional cribbing/matting to distribute load
[CORRECT]
C. Reduce the load by 10% and proceed
D. Increase outrigger extension to maximum and proceed
Correct Answer: B
Rationale: Soft ground requires improved conditions or additional load distribution
through cribbing/matting; switching to on-rubber charts or arbitrary load reductions
does not address ground failure risks.
Q12: The boom angle indicator on a mobile crane must be readable from:
A. The ground near the load
B. The operator's station in the cab [CORRECT]
