Level 8/9: Training Evaluation

What are the four types of resistance encountered in towing and recovery?

Select the design factor applied to high-performance synthetic rigging.

What is the minimum distance between two snatchblocks, in a winching layup, as wire rope is gathered by a winch?

What is the resistance factor for a wheeled casualty which is Mired to Wheel Depth?

Select the minimum boom elevation difference between two wreckers when conducting a one-lane, two wrecker, parallel uprighting recovery (Christmas Wrap) of a large commercial vehicle.

What is the resistance factor for a tracked casualty which is Mired to Body Depth?

Select the two most common causes for rigging failures.

When a casualty is located on a grade and more than one type of resistance is present, weight transfer must be calculated prior to calculating surface resistance.

When a casualty is located on a grade and more than one type of resistance is present, gradient resistance may be calculated before or after calculating surface resistance.

Select the CORRECT statement regarding weight transfer.

Line angle through a traveling snatchblock is 30°. The load on the block is consistent and does not change.  Line load will increase when the line angle through the traveling snatchblock increases to 40°.

Line load of 1,234 lbs. has been measured with a load cell.  The line passes through a fixed snatchblock at 120°.  The force on the block is 2,468 lbs.

Select the most accurate list of roles to be designated for recovery project safety.

What is the recommended W.L.L. for a 12-Ton, screw pin or bolt type shackle when the load is applied on one side, 45° to its major axis?

Select the list that correctly identifies the four hitches used in towing and recovery rigging.

A sling used to rig a basket hitch with horizontal sling angles of 30° has no more capacity than the sling’s vertical hitch rating.

The maximum included angle for an alloy screw pin or bolt-type shackle as a hoist connection is 90°.

When the center of gravity is unknown, attaching your rigging 2-½” in, for every one foot of load length can contribute to enhanced load control.

Select the most accurate method for calculating mechanical advantage in a multi-line winching layup that employs snatchblocks.

What is the maximum included angle when a sling hook has been used as a hoist connection?

Which condition is best suited for using a double wrap choker hitch to maintain load control?

A four-legged wire rope bridle assembly is rated based on the capacity of which of the following?

A four-legged alloy chain bridle assembly is rated based on the capacity of which of the following?

Select the FALSE statement concerning load control.

Select the statement that describes reeving of rigging through the winching connection.

What is the required horizontal sling angle to achieve the full basket hitch rating of any sling?

Calculate the static weight of a concrete beam with the following dimensions. Length: 4 Yards, Width: 24 Inches, Height: 3 Feet.   Concrete weighs 4,050 lbs./ yd³.

Select the CORRECT statement regarding center of gravity.

Select the correct formula for calculating the bridle sling length (hypotenuse of a right-angle triangle). The width (adjacent side length) and height (opposite side length) are known.

Which of the following methods produces the Load Angle Factor for slings connected to a load when the horizontal sling angle is less than 90°?

A Rigging Rated Capacity factor will indicate which of the following facts about a piece of rigging equipment used at a specific angle?

The U.L. value for a rigging component is the force required to break it regardless of its condition and the manner in which it is attached to a load.

The W.L.L. for a piece of rigging is calculated by dividing its U.L. by its design factor.

An empty 53’ dry van trailer has overturned onto its passenger side.  Winds are sustained at 25 mph, 90° to the driver’s side. Which of the following implications should be considered when uprighting the casualty?

An operator has rigged a 2-legged chain bridle constructed of ½” Grade 100 alloy chain to a load weighing 21,500 lbs.  The bridle’s master ring is secured to the hoist connection.  The operator measures the horizontal angle of each leg and finds them both to be 45°.  Can the sling be used to lift the load and remain within its W.L.L.?

Which of the following statements best describes why horizontal sling angles of less than 30° are not recommended for use in slings or bridles for winching or lifting applications?

Select the correct Load Angle Factor for a sling that has a 60° horizontal sling angle.

While conducting a survey of a load that needs to be raised four feet, the operator observes a center of gravity marking.  The marking is two feet from one end of the eight-foot-long load.  The operator attaches a bridle hitch with eight-foot-long legs to each end of the load.  Can the operator correctly assume that the load will be lifted level when force is applied to the hoist connection at the top of the bridle?

Use the following load specifications to calculate the weight of the HEAVY end of a load that needs to be lifted off of a flatbed trailer.  The static weight is 10,000 lbs. The total length is 40 feet.  The center of gravity is 11 feet from one end.  Use the formula: Long Side Weight= (Total Weight ÷ Total Length) x Short Side Length as a part of your calculation to determine the weight of the HEAVY end.

A recovery team has constructed a “Clothes Line” rigging layup to lift a casualty.  The snatchblock on the “Clothes Line” rigging is supporting 3,429 lbs.  After lifting the casualty off of the ground, the angle at the snatchblock is 120°. Select the most accurate line load from below for the “Clothes Line” that is supporting the snatchblock.

Which of the following statements IS a benefit of using a spreader bar to lift a load?

Reeving of slings between the upper rigging connections of a spreader bar and the hoist connection is recommended to maintain positive load control.

Select the minimum distance an operator should maintain between a rotator boom and a power line energized with 440 Volts.

Calculate and select the minimum distance between a rotator boom and a power line energized with 230kV.

Once a rotator wrecker has been leveled on its outrigger pads, it will always remain level throughout the entire lift.

A rotator that is not leveled front to rear and side to side can lose control of a suspended load.

An operator can safely assume the rotator ring gear and turret is level when the toolbox mounted clinometers indicate 0° for both axes.

Body twist and vibration can lead to inaccuracy of toolbox mounted clinometers in rotator wreckers.

Which of the following statements is true regarding cribbing/matting beneath an outrigger pad, float or foot?

Horizontal extension and retraction of outriggers are recommended to be done in which of the following conditions?

An operator would consider creating small gaps between cribbing/matting segments when setting up on moist ground conditions.

As the operator of a rotator wrecker, you’ve been asked to lower a pre-cast concrete headwall into an excavation.  The excavated pit has not been reinforced.  The pit measures 20 feet long, 10 feet wide and 10 feet deep.  Select the most correct statement regarding truck placement from the choices below.

Deploying an outrigger float, pad or foot overtop of underground utilities is acceptable so long as the cribbing/matting surface area is two times the surface area of the float, pad or foot.

When setting up a rotator to lift and rotate with a load that is approaching its rated load lift capacity, an informed operator would consider which of the following practices?

A rotator outrigger float, pad or foot that raises off of the cribbing, matting or supporting surface while conducting a lift is an indication of which of the following conditions?

An operator’s attitude can play a significant role in the success or failure of a job requiring the use of a rotator wrecker.

A ground compression force calculation has been completed as a part of a pre-work survey.  The calculation indicates that one outrigger will exert a force of 38,880 lbs. on the supporting surface.  A soil analysis indicates that the ground will support 30 psi.  Calculate and select the minimum square inches of cribbing/matting to support the outrigger from the choices below.

It is not currently recommended to winch a casualty toward the rear of the rotator wrecker when the rotator’s outriggers are horizontally extended and in contact with the supporting surface.

‘A’ is equal to the downward force on the non-lift side outriggers of a rotator wrecker. ‘B’ is equal to the downward force on the lift side outriggers of a rotator wrecker.  Use the formulas below to calculate the ground compression force on the outriggers.

A= [(GVW x LSD) – (C x OH)] ÷ TD

B= GVW + C – A 

Load weight (C)= 12,000 lbs.  

Rotator static weight (GVW)= 66,250 lbs.  

Overhang (OH)= 97” 

Distance between outrigger floats (TD)= 198” 

Center of turret to lift side outrigger (LSD)= 102”

Rated Load Lift Capacity is the theoretical weight a rotator can lift in specific configurations which causes the non-lift side outrigger pads to lose contact with the supporting surface.

A spreader bar is designed to resist a crushing or compression load across its horizontal components.  Calculate the crush or compression force on a spreader bar whose top rigging has been installed with 45° horizontal sling angles and is supporting a static load of 28,000 lbs.

It is widely recommended that one continuous loop sling be used to form the top rigging of a spreader bar.