Mobile Crane Operator 4 Flashcards
6 cards from real NCCCO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Mobile Crane Operator 4 flashcards as text
When is a pick-and-carry operation permitted on a mobile crane, and what restrictions apply?
Answer: Pick-and-carry is only permitted when the crane is specifically rated for it by the manufacturer, using the on-rubber traveling load chart
Pick-and-carry operations require the crane to be specifically rated for traveling with a suspended load, and must use the manufacturer's traveling load chart (typically only 25-35% of static rated capacity).
What is a suspended personnel platform (man basket) and what specific requirements apply to its use with a mobile crane?
Answer: Personnel platforms must meet ASME B30.23 requirements, require engineering supervision, a pre-lift meeting, load tests, and are only permitted when no safer alternative exists
Crane-lifted personnel platforms are highly regulated under OSHA 29 CFR 1926.1431, requiring pre-lift tests, pre-lift meetings, qualified engineer design, and demonstration that no safer alternative means exists.
What does the term 'working radius' mean and how is it precisely measured for load chart use?
Answer: Working radius is the horizontal distance from the crane's rotation centerline to the center of the suspended load
Working radius (load radius) is the horizontal distance measured from the crane's vertical rotation axis (center pin or turntable centerline) to the center of the hook and load, used directly to determine rated capacity from the load chart.
What is the correct crane configuration for a critical lift (lift exceeding 75% of rated capacity)?
Answer: Critical lifts require a written lift plan prepared by a qualified person, a pre-lift meeting, additional inspections, and may require engineering sign-off
Critical lifts require a detailed written lift plan, pre-lift meeting with all participants, thorough equipment inspection, and often engineering review to document that all safety requirements are met.
Why must a crane operator read and understand the specific load chart for the crane model being operated?
Answer: Each crane model has unique structural and stability characteristics; using another crane's chart can result in dangerous overloads
Each crane model has unique dimensions, counterweight configurations, boom properties, and structural capacities that result in different rated capacities; using a chart from a different model can result in serious overloads.
What must a crane operator do when they receive a signal they do not understand?
Answer: Stop all crane movement immediately and communicate with the signal person to clarify the signal before resuming operations
OSHA and industry standards require that crane operators stop all movement immediately when they receive a signal they cannot clearly understand, and must not resume operations until the signal is clarified and understood.