RSP Rigging Procedures & Equipment 2 — Questions and Answers
Question 1: What is the minimum number of wire rope clips required to secure a loop in a 1-inch diameter wire rope?
- 2 clips
- 3 clips
- 4 clips (Correct answer)
- 6 clips
Correct answer: 4 clips
ASME B30.26 requires a minimum of 4 wire rope clips for a 1-inch diameter wire rope termination.
Question 2: When a shackle is used in a rigging assembly, the pin should be:
- Finger-tight only to allow rotation
- Fully tightened and then backed off a quarter turn
- Fully tightened and moused with seizing wire (Correct answer)
- Left loose so the load can center itself
Correct answer: Fully tightened and moused with seizing wire
Shackle pins must be fully tightened and secured (moused) with wire or a cotter pin to prevent the pin from unscrewing under dynamic loading.
Question 3: Which sling hitch applies the GREATEST stress on a sling of a given rated capacity?
- Straight (vertical) hitch
- Basket hitch
- Choker hitch (Correct answer)
- Double-wrap basket hitch
Correct answer: Choker hitch
A choker hitch reduces the sling's working load limit to approximately 75% of the rated capacity due to the bend and angle applied at the choke point.
Question 4: A wire rope sling shows a 'birdcage' deformation. The correct action is to:
- Reduce the load and continue using it
- Straighten the rope with a hammer before use
- Remove it from service immediately (Correct answer)
- Apply lubrication and retest
Correct answer: Remove it from service immediately
A birdcage (wires or strands pushed outward) is a disqualifying condition; the sling must be removed from service immediately.
Question 5: The term 'fleet angle' in rigging refers to:
- The horizontal distance between a crane and its load
- The angle between the rope and the centerline of a sheave (Correct answer)
- The angle formed between two sling legs
- The inclination of a crane boom from vertical
Correct answer: The angle between the rope and the centerline of a sheave
Fleet angle is the angle formed between the rope and the centerline of a drum or sheave; excessive fleet angle causes uneven wear and rope damage.
Question 6: When rigging a load with two sling legs at a 120-degree included angle between them, the tension in each sling leg is:
- Equal to the load weight
- Less than the load weight
- Greater than the load weight (Correct answer)
- Zero because the angles cancel out
Correct answer: Greater than the load weight
At a 120-degree included angle, each sling leg carries more than the load weight; tension increases dramatically as the angle between legs increases beyond 90 degrees.
Question 7: Which type of wire rope construction is MOST resistant to abrasion on the outer surface?
- 6×37 IWRC
- 6×7 FC (Correct answer)
- 19×7 rotation-resistant
- 6×19 IWRC
Correct answer: 6×7 FC
6×7 FC (fiber core) rope has fewer, larger outer wires, making it more resistant to surface abrasion despite being less flexible.
RSP Rigging Procedures & Equipment 2
What is the minimum number of wire rope clips required to secure a loop in a 1-inch diameter wire rope?