NCCCO Rigging Techniques & Equipment Inspection 5

Question 1

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?

Accepted Answer

6,600 lbs

Answer

Per ASME B30.9 color coding for synthetic roundslings, a purple sling has a vertical rated capacity of 6,600 lbs.

Question 2

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?

Accepted Answer

Bird-caging

Answer

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.

Question 3

According to NCCCO rigging standards, what is the minimum design factor (safety factor) required for rigging hardware such as hooks and shackles?

Accepted Answer

4:1

Answer

ASME B30.9 requires a minimum design factor of 4:1 (breaking strength to working load limit) for rigging hardware including hooks and shackles.

Question 4

When landing a load on wooden dunnage, why should the sling be kept under slight tension before the final set-down?

Accepted Answer

To prevent the sling from being pinched under the load

Answer

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.

Question 5

Which of the following is an acceptable practice when using an eye bolt for rigging?

Accepted Answer

Using a shouldered eye bolt for angular loads

Answer

Shouldered (or collared) eye bolts are designed to accept angular loads, while regular eye bolts must only be loaded in line with the shank.

NCCCO (National Commission for the Certification of Crane Operators) Practice Test

NCCCO (National Commission for the Certification of Crane Operators) Practice Test

NCCCO Rigging Techniques & Equipment Inspection 5