MASS MASS Test Rigging and Slings 1 — Questions and Answers
Question 1: What is the primary purpose of a rigging inspection before a lift?
- To determine the load's center of gravity
- To identify defects that could cause failure during the lift (Correct answer)
- To calculate the headroom needed
- To measure the rope diameter
Correct answer: To identify defects that could cause failure during the lift
Pre-lift inspections identify defects such as cuts, kinks, or corrosion that could cause rigging to fail under load.
Question 2: Which sling type offers the greatest flexibility and is best suited for irregular-shaped loads?
- Wire rope sling
- Chain sling (Correct answer)
- Web sling
- Roundsling
Correct answer: Chain sling
Chain slings are highly flexible, durable, and conform well to irregular load shapes while withstanding heat and abrasion.
Question 3: What does the term 'Working Load Limit' (WLL) mean in rigging?
- The maximum load a sling can carry under ideal conditions (Correct answer)
- The weight of the rigging hardware itself
- The load applied during proof testing
- The breaking strength divided by 10
Correct answer: The maximum load a sling can carry under ideal conditions
Working Load Limit is the maximum load a piece of rigging equipment is rated to carry under normal, intended conditions.
Question 4: When a sling is used in a basket hitch, how does the rated load capacity change compared to a straight vertical hitch?
- It decreases by 50%
- It remains the same
- It increases up to 2 times (Correct answer)
- It increases by 10%
Correct answer: It increases up to 2 times
A basket hitch distributes the load across two legs, which can increase the rated capacity up to twice that of a single vertical hitch.
Question 5: Which condition requires a wire rope sling to be immediately removed from service?
- Minor surface oxidation
- Six randomly distributed broken wires in one lay (Correct answer)
- Slight stiffness after storage
- Visible rope twist from previous use
Correct answer: Six randomly distributed broken wires in one lay
ASME B30.9 requires removal of wire rope slings with six or more randomly distributed broken wires in one rope lay.
Question 6: What is the correct action if a synthetic web sling shows cuts, burns, or chemical damage?
- Reinforce it with tape and continue use
- Reduce the rated load by 25% and continue
- Remove it from service and destroy it (Correct answer)
- Return it to the manufacturer for repair
Correct answer: Remove it from service and destroy it
Synthetic web slings with cuts, burns, or chemical damage must be removed from service and destroyed to prevent accidental reuse.