NCCCO Rigging Fundamentals and Hardware 5 — Questions and Answers
Question 1: Which type of hook is specifically designed to prevent accidental release of a sling or load during a lift?
- Swivel hook
- Clevis hook
- Shank hook
- Safety latch hook (Correct answer)
Correct answer: Safety latch hook
Safety latch hooks incorporate a spring-loaded latch that must be manually depressed to open, preventing accidental sling or load release.
Question 2: When rigging a load with multiple lift points, the load should be picked up using a test lift by raising the load:
- To full hook height immediately to confirm balance
- A few inches off the ground to check balance and sling tension before proceeding (Correct answer)
- At maximum crane speed to minimize rigging stress
- Only after all personnel have left the immediate area permanently
Correct answer: A few inches off the ground to check balance and sling tension before proceeding
A trial lift a few inches off the ground lets the rigger verify load balance, sling tension, and stability before committing to the full lift.
Question 3: The minimum number of full tucks required for a proper mechanical splice in wire rope is:
- 2
- 3
- 5 (Correct answer)
- 7
Correct answer: 5
ASME B30.9 requires a minimum of 5 full tucks for a proper mechanical splice in wire rope to achieve full rated capacity.
Question 4: A turnbuckle used in a rigging assembly should always be:
- Loaded in bending to maximize flexibility
- Loaded in line (tension) along its axis only (Correct answer)
- Lubricated with grease on threads before each use mandatorily
- Overtightened to prevent loosening under dynamic loads
Correct answer: Loaded in line (tension) along its axis only
Turnbuckles are rated for axial tension loads only; side-loading or bending a turnbuckle can cause premature failure well below its rated capacity.
Question 5: What is the purpose of a tag line during a crane lift?
- To signal the crane operator to lower the load
- To attach additional rigging hardware to the hook
- To control load spin and prevent uncontrolled rotation (Correct answer)
- To measure the height of the load above the ground
Correct answer: To control load spin and prevent uncontrolled rotation
Tag lines are used by ground personnel to control load rotation and lateral movement during a lift, keeping the load positioned safely.
Question 6: When storing wire rope slings, which of the following is the correct practice?
- Coil and hang them on a clean, dry rack away from chemicals and heat (Correct answer)
- Store them on the ground in a designated area near the work site
- Submerge them in oil to prevent corrosion during long-term storage
- Fold them tightly to minimize storage space required
Correct answer: Coil and hang them on a clean, dry rack away from chemicals and heat
Wire rope slings should be coiled and hung on a clean, dry rack, away from chemicals, excessive heat, and moisture to prevent corrosion and damage.
Question 7: When a rigging component's identification tag or embossed markings are no longer legible, the correct action is to:
- Estimate the capacity based on the component's size and use it accordingly
- Contact the manufacturer to get a replacement rating
- Remove the component from service immediately (Correct answer)
- Mark the estimated capacity with a paint marker and return it to service
Correct answer: Remove the component from service immediately
If a rigging component's identification markings are illegible, it cannot be verified for safe use and must be immediately removed from service.
NCCCO Rigging Fundamentals and Hardware 5
Which type of hook is specifically designed to prevent accidental release of a sling or load during a lift?