NCCCO Rigging Fundamentals and Hardware

Question 1

What is the rated capacity of a wire rope sling used in a basket (U-wrap) configuration at an included angle of 120 degrees (60 degrees from vertical for each leg)?

Accepted Answer

Approximately 1.73 times the single-leg vertical capacity

Answer

At an included angle of 120 degrees (60 degrees from vertical per leg), the basket hitch capacity is approximately 1.73 times a single vertical leg due to the geometry. As the angle increases further, capacity decreases rapidly.

Question 2

A synthetic web sling is found to have a cut that has penetrated approximately 40% of the sling width. What is the correct action?

Accepted Answer

Remove the sling from service immediately — any cut penetrating the sling body is a removal criterion per ASME B30.9

Answer

ASME B30.9 requires removing synthetic web slings from service when cuts, tears, or abrasion remove material from the load-bearing webbing. Any cut penetrating the webbing warrants removal.

Question 3

When using a shackle in a rigging application, what is the correct orientation and securing method for the screw pin?

Accepted Answer

The pin should be fully seated and moused (safety wired or taped) to prevent rotation and backing out under load

Answer

Rigging shackle screw pins must be fully tightened and moused with wire, tape, or a cotter pin to prevent the pin from backing out under repeated loading and unloading cycles.

Question 4

What information is required on a wire rope sling's identification tag per ASME B30.9?

Accepted Answer

Manufacturer's name, rated capacity for each hitch type, and sling diameter or construction

Answer

ASME B30.9 requires wire rope slings to be tagged with the manufacturer's name, sling rated capacity (for each configuration — vertical, choker, basket), and the sling's construction (diameter, classification).

Question 5

A rigger is sizing a wire rope sling for a straight vertical (single-leg) lift of a 10,000-lb structural beam. Which factor is most critical in selecting the sling?

Accepted Answer

The sling's rated capacity in the vertical hitch configuration must equal or exceed the total load weight

Answer

The fundamental sling selection criterion is that the sling's rated capacity in the configuration being used must meet or exceed the total load weight including all below-the-hook hardware.

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

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

NCCCO Rigging Fundamentals and Hardware