Rigging Techniques & Equipment Inspection 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 Rigging Techniques & Equipment Inspection flashcards as text
A rigger is preparing to lift a load using a synthetic roundsling. The sling color is purple. What is the vertical rated capacity of this sling?
Answer: 6,600 lbs
Per ASME B30.9 color coding for synthetic roundslings, a purple sling has a vertical rated capacity of 6,600 lbs.
What condition is described when a wire rope strand is pushed out of its normal position due to a kink being pulled through a block?
Answer: Bird-caging
Bird-caging occurs when a wire rope is subjected to sudden shock or a kink is pulled through a sheave, causing the outer strands to flare outward like a bird cage.
According to NCCCO rigging standards, what is the minimum design factor (safety factor) required for rigging hardware such as hooks and shackles?
Answer: 4:1
ASME B30.9 requires a minimum design factor of 4:1 (breaking strength to working load limit) for rigging hardware including hooks and shackles.
When landing a load on wooden dunnage, why should the sling be kept under slight tension before the final set-down?
Answer: To prevent the sling from being pinched under the load
Keeping slight tension on the sling during final set-down prevents it from being trapped and damaged under the load when the load contacts the dunnage.
Which of the following is an acceptable practice when using an eye bolt for rigging?
Answer: Using a shouldered eye bolt for angular loads
Shouldered (or collared) eye bolts are designed to accept angular loads, while regular eye bolts must only be loaded in line with the shank.
A rigger notices that a hook's latch does not spring back into the closed position after being depressed. What is the correct action?
Answer: Remove the hook from service until repaired
A hook with a malfunctioning latch must be removed from service because the latch is a safety device that prevents the load from accidentally disengaging.
What is the effect on a sling's working load limit when the sling angle (measured from horizontal) decreases from 90° to 30°?
Answer: The WLL decreases because horizontal tension in each sling leg increases
As sling angle decreases from vertical (90°), the tension in each sling leg must increase to support the same load, reducing the effective working load limit; at 30°, tension nearly doubles.