NCCCO MOBILE CRANE EXAM

NCCCO MOBILE CRANE EXAM / –

VERIFIED QUESTIONS AND 100%

CORRECT ANSWERS | GRADE A

CERTIFICATION GUIDE

• What action does a signal person intend the operator to perform if they extend their

arm at shoulder height, make a fist, and stick their thumb up?

• Boom down
• Swing
• Boom up
• Extend boom

Correct Answer: C

Rationale: According to ASME B30.5 and NCCCO hand signal standards, an extended

arm at shoulder height with a fist and thumb up indicates the "boom up" command to raise the crane’s boom.

• When hoisting personnel, within what percentage of level must a telescopic boom

crane be to maintain valid load chart ratings?

• 1%
• 2%
• 5%
• 8%

Correct Answer: A

Rationale: OSHA 1926.1431 and NCCCO standards require a telescopic boom crane to be within 1% of level when hoisting personnel to ensure load chart ratings remain valid and safe.

• If a crane’s load line contacts an energized power line and there is no immediate

danger like fire, what should the operator do?

• Climb down from the cab
• Jump down, feet together
• Stay in the cab until lines are de-energized
• Move the crane away from the line

Correct Answer: C

Rationale: OSHA 1926.1408 and NCCCO guidelines state that operators must remain in the cab until the power lines are confirmed de-energized to avoid electrocution risk.

• According to OSHA 1926.1413, how many randomly distributed broken wires in

rotation-resistant rope require rope replacement?

• 1 broken wire in 6 rope diameters
• 2 broken wires in 30 rope diameters
• 3 broken wires in one strand in one lay
• 2 broken wires in 6 rope diameters

Correct Answer: D

Rationale: OSHA 1926.1413 specifies that rotation-resistant rope must be replaced if there are 2 broken wires in 6 rope diameters or 4 in 30 rope diameters. 1 / 2

• What is the net capacity of a mobile crane unless otherwise stated by the

manufacturer?

• Load chart capacity minus rigging and all attachments
• Load chart capacity plus rigging and attachments
• Load chart capacity minus unused attachments
• Load chart capacity minus rigging alone

Correct Answer: A

Rationale: NCCCO load chart interpretation requires subtracting the weight of rigging and all attachments (e.g., hook block, jib) from the gross capacity to determine net capacity.

• What may happen to a properly rigged load when lifted unless the operator

accounts for boom deflection?

• It could swing out away from the crane
• It could swing toward the crane
• It could lift vertically
• It could shift in its rigging

Correct Answer: A

Rationale: Boom deflection under load causes the load to move outward from the crane’s center, requiring the operator to adjust for stability per ASME B30.5.

• What does the Standard Method hand signal with both arms extended horizontally,

palms down, indicate?

• Swing
• Stop
• Emergency stop
• Travel

Correct Answer: B

Rationale: ASME B30.5 defines this signal as “stop,” used to halt all crane movements, ensuring clear communication on the worksite.

• Who should a crane operator respond to when receiving a “stop” signal?
• Appointed signal person only
• Project manager only
• Superintendent only
• Anyone

Correct Answer: D

Rationale: NCCCO and OSHA 1926.1419 require operators to respond to a “stop” signal from anyone, prioritizing safety over designated roles.

• Where is the tipping axis of a crawler crane located?
• Centerline of the idler or sprocket
• Depends on idler/sprocket alignment with track rollers
• Centerline of the crane cab
• Through the boom butt section

Correct Answer: B

Rationale: The tipping axis of a crawler crane varies based on whether the idler or sprocket is offset or aligned with track rollers, affecting stability calculations per ASME B30.5.

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