Millwright Certification Rigging Techniques 2

Question 1

What is the purpose of a tag line when performing a crane lift?

Accepted Answer

To control the load's rotation and prevent it from spinning or swinging during the lift

Answer

To identify the load's weight

Answer

To increase the crane's lifting capacity

Answer

To measure the height of the lift

Question 2

What is the safe working load (SWL) of a sling, and how does it relate to the breaking strength?

Accepted Answer

SWL is the maximum load a sling can safely lift, calculated by dividing the breaking strength by a safety factor (typically 5:1 for wire rope slings)

Answer

SWL and breaking strength are the same value

Answer

SWL is always double the breaking strength

Answer

SWL is determined by the sling color

Question 3

How does the sling angle affect the load on each leg of a multi-leg sling arrangement?

Accepted Answer

As the sling angle from vertical decreases (spreads wider), the load on each sling leg increases due to the horizontal force component

Answer

Angle has no effect on sling loading

Answer

Wider angles reduce the load on each sling leg

Answer

Sling angle only affects balance, not load

Question 4

What is a basket hitch, and when is it appropriate to use?

Accepted Answer

A sling passed under the load with both ends attached to the hook, doubling the sling capacity for loads that are stable and balanced

Answer

A hitch used only for lifting baskets

Answer

A decorative knot for lifting

Answer

A basket hitch is the same as a choker hitch

Question 5

Before performing any lift, what is the first thing a rigger must determine?

Accepted Answer

The weight of the load, including the weight of rigging hardware attached to it

Answer

The color of the crane

Answer

The time of day

Answer

The names of all personnel in the area

Question 6

What is the danger of using a damaged or kinked wire rope sling?

Accepted Answer

Damage concentrates stress at the defect, drastically reducing the sling's capacity below its rating and creating an unpredictable failure point

Answer

It may change color

Answer

Damaged slings are stronger because they have been work-hardened

Answer

Kinked slings just look bad but work fine