Question 1

A web sling gets its strength based on its width, not its length.

Accepted Answer

The strength of a web sling is determined by its width, as a wider sling can distribute the weight of the load over a larger surface area, reducing stress on any one point of the sling. Length can still be important for ensuring proper coverage and securing the load, but it does not affect the strength of the sling in the same way as width.

Question 2

Medium to heavy loads can be lifted using&#10;A) block and tackle.&#10;B) slings.&#10;C) knots and hitches.&#10;D) hoists.

Accepted Answer

Hoists are specifically designed for lifting medium to heavy loads and are the most efficient and safest choice for this type of task. Block and tackle and slings can be used for lifting, but they are better suited for lighter loads. Knots and hitches are not appropriate for lifting heavy loads as they can slip or fail under pressure.

Question 3

A choker hitch has less lifting capacity than a basket hitch.

Accepted Answer

A choker hitch is a type of rigging method where the sling or rope is wrapped around the load and then fed through the choke point to create a loop. This creates a point load on the sling, reducing its capacity compared to a basket hitch where the load is supported on all sides. Therefore, a choker hitch has less lifting capacity than a basket hitch.

Question 4

The use of tackle, equipment, or machinery fitted for a specific purpose is called&#10;A) hoisting.&#10;B) rigging.&#10;C) lifting.&#10;D) block and tackle.

Accepted Answer

The use of tackle, equipment, or machinery fitted for a specific purpose is called rigging. Hoisting and lifting are specific actions that may be accomplished through rigging, but do not encompass the entirety of rigging. Block and tackle is a specific type of rigging that utilizes pulleys and ropes to increase the mechanical advantage of lifting heavy loads.

Question 5

A basket hitch has twice the lifting capacity of a vertical leg hitch.

Accepted Answer

A basket hitch distributes the load evenly across two legs of the sling, effectively doubling the lifting capacity compared to a vertical leg hitch, which uses only one leg of the sling.

Question 6

Construction cranes can lift loads of up to&#10;A) 100 tons or more.&#10;B) 200 tons or more.&#10;C) 300 tons or more.&#10;D) more than 500 tons.

Accepted Answer

Construction cranes are capable of lifting loads ranging from 10 to over 3000 tons. However, the average maximum lifting capacity of a standard construction crane is around 300 tons. Thus, the best answer is C, which states "300 tons or more."

Question 7

The wider the angle between the legs of a bridle hitch, the lower the lifting capacity.

Accepted Answer

This is true because when the angle between the legs of a bridle hitch is wider, it creates more horizontal tension and less vertical tension, resulting in a lower lifting capacity. As the angle becomes narrower, the vertical tension increases, allowing for a higher lifting capacity.

Question 8

A mechanical device used in the plumbing industry to move relatively lightweight objects through leverage is called a ____.&#10;A) hitch&#10;B) crane&#10;C) come-along&#10;D) permanent hoist

Accepted Answer

A come-along is a portable hand-operated winch or cable hoist that is commonly used in the plumbing industry for moving relatively lightweight objects with the help of leverage. Options A, B, and D are not as commonly used in the plumbing industry for this purpose.

Question 9

Knowing the weight of the object is all that is needed to make a safe lift.

Accepted Answer

While knowing the weight of the object is a crucial factor in making a safe lift, other factors such as the size, shape, center of gravity, and the presence of any hazardous materials must also be considered. Additionally, proper lifting techniques and equipment must be used to ensure a safe lift.

Question 10

In general, the best hitch to use for plumbing hoisting operations is the&#10;A) half hitch.&#10;B) timber hitch.&#10;C) clove hitch.&#10;D) cat's paw.

Accepted Answer

The clove hitch is commonly used in plumbing hoisting operations because it is easy to tie and untie, and it holds well under tension, making it suitable for securing pipes and other cylindrical objects.

Deck 21: Hoisting and Rigging