Rigging Fundamentals and Hardware 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 Rigging Fundamentals and Hardware flashcards as text
What effect does a sling angle have on the tension in each leg of a two-leg bridle sling?
Answer: As the sling angle decreases from vertical, each leg must carry more than the simple load share, increasing leg tension
As sling legs become more horizontal (smaller angle from horizontal), the tension in each leg increases significantly beyond the simple load share, due to the vector components of the forces.
What does a wire rope sling's 'rated load' depend upon, and where is it specified?
Answer: Rated load depends on rope construction, diameter, configuration, and sling angle; it is specified on the sling identification tag and in manufacturer's data
Wire rope sling rated loads depend on rope construction, diameter, end termination type, sling configuration, and hitch type; all are specified on the sling's required identification tag and in manufacturer documentation.
What is a shackle's 'working load limit' (WLL), and what marks must be present on a rated shackle?
Answer: WLL is the maximum load assigned by the manufacturer for the intended application; shackles must be marked with the manufacturer's name, WLL, and size
WLL is the maximum load a shackle is rated for in its intended use. ASME B30.26 requires shackles to be marked with the manufacturer's name or trademark, the WLL, and size.
When using a choker hitch with a synthetic web sling around a load with sharp edges, what protection must be used?
Answer: Corner protectors, padding, or edge guards must be used to protect the sling from cuts that can reduce its load capacity
Synthetic slings are vulnerable to cuts and abrasion from sharp edges, which can drastically reduce their rated capacity. Corner protectors, edge guards, or padding must be used wherever the sling contacts sharp edges.
A synthetic round sling has a blue colored core sleeve. According to ASME B30.9 color coding, what is its vertical hitch rated capacity range?
Answer: 2,100 to 5,300 lbs
According to ASME B30.9, blue color-coded synthetic round slings are rated at 2,100 to 5,300 lbs in a vertical hitch (the exact value is marked on the sling tag).
What is the difference between a 'mechanical advantage' rigging system and a 'single line' rigging system?
Answer: A mechanical advantage system uses multiple parts of line (block and tackle) to reduce the tension in the hauling line; a single line applies the full load to one rope part
A mechanical advantage system (block and tackle) uses multiple rope parts to distribute load, reducing tension in any single rope part. A single-line system applies the full load to one rope with no mechanical advantage.