NCCCO Sling Types and Load Distribution 3

Question 1

When using a two-leg bridle sling at a 60-degree angle from horizontal, the tension in each leg compared to a vertical hitch is approximately:

Accepted Answer

1.15 times the load per leg

Answer

At 60 degrees from horizontal, the tension factor is approximately 1.15, so each leg carries slightly more than the load divided by two.

Question 2

A wire rope sling with a kinked or birdcaged section should be:

Accepted Answer

Removed from service immediately

Answer

Kinked or birdcaged wire rope slings are permanently damaged and must be removed from service because their rated capacity is significantly compromised.

Question 3

Which sling type is most susceptible to damage from ultraviolet (UV) light exposure?

Accepted Answer

Synthetic web slings

Answer

Synthetic web slings made from nylon or polyester degrade when exposed to prolonged UV light, weakening the fibers and reducing rated capacity.

Question 4

When a load is lifted with an unbalanced center of gravity using a single vertical hitch, the risk is:

Accepted Answer

Load tipping or swinging uncontrollably

Answer

A single vertical hitch on an off-center load will cause the load to tip or swing because it cannot resist rotational forces.

Question 5

The D/d ratio for wire rope slings refers to:

Accepted Answer

Bend radius of the fitting divided by wire rope diameter

Answer

The D/d ratio is the diameter of curvature (bend) divided by the wire rope diameter; lower ratios cause efficiency loss and must meet minimum requirements.

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

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

NCCCO Sling Types and Load Distribution 3