Basics Of Rigging Trivia Exam: Quiz!

Explanation
If the rigging on the hook is 1/2 inch off-center, it means that the load is not evenly distributed. This imbalance can reduce the load-carrying capacity of the hook. The correct answer of 80% suggests that the hook can still carry 80% of its maximum load despite the off-center rigging. This means that the rigging imbalance has a moderate impact on the load-carrying capacity, reducing it by 20%.

Explanation
The correct answer is "Approx..10,000lb." because each timber weighs approximately 625lb (10,000lb divided by 16).

Explanation
When using a 2 part bridle with a sling angle of 45 degrees, the size of the rigging needed to lift a load of 31,000 pounds is 1 1/4. The sling angle affects the capacity of the rigging, and a 45-degree angle reduces the capacity by approximately 30%. Therefore, the rigging size needs to be larger to compensate for the reduced capacity and ensure the safe lifting of the load. In this case, 1 1/4 is the appropriate size to handle the 31,000-pound load with a 45-degree sling angle.

Explanation
If a wire rope shows evidence of heat damage, it is crucial to take it out of service immediately. Heat damage can weaken the wire rope, making it unsafe to use. Continuing to use the damaged wire rope can lead to catastrophic failure, causing accidents and injuries. Therefore, it is essential to remove the wire rope from service to prevent any potential hazards.

Explanation
Kiewit's policy does not allow for chains to be used for general rigging.

Explanation
The correct answer is a capacity stamped on the spreader bar and a design drawing showing correct configuration. These items are necessary before using a spreader bar to ensure that it is safe and suitable for the intended lifting operation. The capacity stamped on the spreader bar indicates the maximum weight it can safely handle, while the design drawing shows the correct configuration to ensure proper usage. Both of these items are crucial for ensuring the safety and effectiveness of the spreader bar during lifting operations.

Explanation
The given answer, "All of the above," is correct because any of the mentioned conditions can indicate a wire rope that needs to be taken out of service. If there are 3 broken wires in one strand of a lay, it indicates potential weakness and compromise of the rope's strength. Similarly, if there are 6 broken wires in one entire lay, it further highlights the deterioration of the rope. Kinking, birdcaging, or distortion of the wire rope can also lead to reduced strength and reliability. Therefore, any of these conditions warrant removing the wire rope from service to ensure safety.

Explanation
The Basic Guidelines include never exceeding the W.L.L. (Working Load Limit), always using a tag line, and never getting under the load. These guidelines are important for ensuring safety and preventing accidents when working with heavy loads. By following these guidelines, workers can minimize the risk of overloading equipment, maintain control of the load, and avoid being in a dangerous position underneath the load. Therefore, the correct answer is "all of the above" as all three statements are part of the Basic Guidelines.

Explanation
Side loading a round pin shackle can cause it to fail under load. Round pin shackles are designed to be loaded in-line with the pin, not at an angle. When a round pin shackle is side loaded, it puts stress on the pin and can cause it to bend or break. This can lead to the shackle coming apart and potentially causing injury or damage. Therefore, it is important to never side load a round pin shackle to ensure safety and prevent accidents.

Explanation
Softeners are sometimes needed to avoid damaging rigging and/or equipment. Softeners are materials or devices that are used to cushion or protect the rigging or equipment from excessive force or pressure. They can be used to distribute the load more evenly, reduce friction, absorb shock, or provide a buffer between the rigging and equipment. By using softeners, potential damage to the rigging or equipment can be minimized, ensuring their longevity and safe operation.

Explanation
When all legs of the sling are equally spaced around the center of gravity, the load will be evenly distributed among all the legs. This means that each sling will bear an equal portion of the load, and there will be no teetering or uneven loading. Therefore, the statement that the sling sizes should be based on only four legs is incorrect. The correct answer is FALSE.

Explanation
A higher sling angle refers to the angle at which the sling is attached to the load being lifted. When using a 2 part bridle, a higher sling angle means that the load is being lifted more vertically, which allows for greater lifting capacity. This is because a higher sling angle reduces the load on each individual sling leg, distributing the weight more evenly and increasing the overall lifting capacity. Therefore, having a higher sling angle is indeed better when using a 2 part bridle.