NCCCO Mobile Crane Operator Test 1 4 — Questions and Answers
Question 1: Before a mobile crane operator accepts a lift assignment, the operator MUST verify:
- The lift plan has been approved by the crane manufacturer
- The weight of the load and rigging, the pick radius, and the crane configuration capacity (Correct answer)
- That a spotter is stationed at least 50 feet from the crane
- The color code on the rigging matches the load's SWL tag
Correct answer: The weight of the load and rigging, the pick radius, and the crane configuration capacity
The operator must confirm that the total load (load + rigging) at the intended radius does not exceed the crane's rated capacity in its configured setup.
Question 2: A crane operator receives conflicting hand signals from two different signalers during a critical lift. The operator should:
- Follow signals from the person closest to the load
- Follow the signal from the person with the most seniority
- Stop all movement immediately and do not resume until one designated signaler is identified (Correct answer)
- Continue the lift using the last signal received
Correct answer: Stop all movement immediately and do not resume until one designated signaler is identified
ASME B30.5 and OSHA require that only one designated signaler direct crane operations; conflicting signals require an immediate stop.
Question 3: What is the primary reason a mobile crane's outrigger pads are used?
- To anchor the crane permanently to the ground
- To distribute the outrigger load over a larger ground surface area (Correct answer)
- To provide electrical grounding for the crane structure
- To prevent the outrigger cylinder from sinking due to hydraulic leak
Correct answer: To distribute the outrigger load over a larger ground surface area
Outrigger pads spread the concentrated point load from the outrigger float over a larger area to prevent ground penetration and crane settlement.
Question 4: A 'critical lift' under NCCCO and ASME B30.5 standards is typically defined as any lift that exceeds what percentage of the crane's rated capacity?
- 50%
- 75% (Correct answer)
- 85%
- 95%
Correct answer: 75%
ASME B30.5 defines a critical lift as one that exceeds 75% of the crane's rated capacity or involves other defined risk factors.
Question 5: Which of the following best describes 'two-blocking' on a mobile crane?
- Running two separate load blocks simultaneously on the same boom
- The upper and lower load blocks making contact, causing potential wire rope failure (Correct answer)
- Using two cranes to lift a single load beyond individual capacity
- A condition where two outriggers on the same side lose ground contact
Correct answer: The upper and lower load blocks making contact, causing potential wire rope failure
Two-blocking occurs when the hook block contacts the boom tip or upper block, which can snap the wire rope and drop the load.
Question 6: When a mobile crane is traveling on a public road, the boom should be:
- Raised to maximum elevation to minimize width
- Removed and transported separately on a flatbed
- Lowered and secured in the travel position per the manufacturer's specification (Correct answer)
- Extended fully to balance the counterweight during transit
Correct answer: Lowered and secured in the travel position per the manufacturer's specification
The boom must be lowered and locked in the manufacturer-specified travel position to maintain stability and comply with height restrictions.
Question 7: The term 'net capacity' on a mobile crane load chart refers to:
- The total load the crane can lift including the hook, block, and rigging weight
- The rated capacity minus the weight of the hook block, ball, and all rigging (Correct answer)
- The maximum load the crane can lift on a 100% boom extension
- The capacity available after deducting a mandatory 25% safety factor
Correct answer: The rated capacity minus the weight of the hook block, ball, and all rigging
Net capacity is the weight available for the actual load after subtracting all below-the-hook rigging hardware weight from the rated capacity.
NCCCO Mobile Crane Operator Test 1 4
Before a mobile crane operator accepts a lift assignment, the operator MUST verify: