Telescoping Boom and Jib Configuration Flashcards
7 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 7 Telescoping Boom and Jib Configuration flashcards as text
Common jib offset angles available on most mobile telescoping cranes include:
Answer: 0°, 15°, 30°, and 45°
Most mobile crane manufacturers provide rated capacities at 0°, 15°, 30°, and 45° offset angles, with 0° providing the greatest capacity and 45° the least.
When wind speed exceeds the manufacturer's operational limit during jib operations, the operator should:
Answer: Secure the load and discontinue crane operations until wind conditions improve
A jib significantly increases the crane's wind-exposed surface area; exceeding rated wind speeds creates dynamic loading that can exceed structural limits, requiring work stoppage.
Which document is the authoritative source for whether a specific crane can telescope its boom while a load is suspended?
Answer: The crane manufacturer's load chart and operational manual
OSHA references the manufacturer's documentation for configuration-specific operational limits; only the manufacturer's manual specifies if and how power telescoping under load is permitted for that crane model.
When adding a jib increases the crane's total system height, the operator must:
Answer: Re-evaluate overhead power line clearances for the new taller configuration
The jib adds height to the maximum boom-tip elevation, which can eliminate previously acceptable clearances from power lines or other overhead hazards.
When a swingaway jib is in the 'cradled' travel position, it means the jib is:
Answer: Folded back and secured alongside the main boom for transport
The cradled position stores the jib alongside the main boom using manufacturer-provided brackets or straps, keeping it within legal transport dimensions and preventing damage.
When a crane's boom configuration changes from the setup used to originally calculate outrigger requirements, the operator must:
Answer: Recalculate ground bearing pressure and outrigger requirements for the new configuration
Changes in boom length, jib attachment, or counterweight alter the load distribution on outriggers; ground bearing pressure must be recalculated to prevent mat sinking or ground failure.
Before using any boom extension or jib attachment, what is the minimum required inspection?
Answer: A visual inspection for deformation, cracks, missing or damaged pins, and worn connections
Pre-use visual inspection is required by OSHA and NCCCO standards to identify any damage, missing hardware, or wear that could cause failure; NDT methods are reserved for periodic or post-incident inspections.