TROCP Level 3 Prep Exam

Your client’s tandem-axle concrete mixer became disabled while driving up a 15° grade. Its drive axle tires are mired to wheel depth. Its steering tires are able to roll freely on the soft ground. The mixer has a static/gross weight of 31,860 lbs. The steering axle weighs 11,608 lbs. The drive axles weigh 20,252 lbs. Calculate the mixer’s total resistance if a winching method is employed to pull it forward, up the grade.

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<img src=”http://admin.towcert.com/app/uploads/sites/2/2021/05/Question-2-300×114.jpg” alt=”” width=”300″ height=”114″ class=”alignnone size-medium wp-image-49744″ />A wrecker has been backed into position on a 15° grade. Activation of the winching brake has caused all of its brakes to be applied. The wrecker has a static/gross weight of 34,081 lbs. The steering axle of the wrecker weighs 11,896 lbs. The drive axles of the wrecker weigh 22,185 lbs. Calculate the Anchor-ability of the wrecker assuming its brakes are the only source of resistance and the rear of the wrecker is facing downhill

A winching layup consisting of three snatchblocks and wire rope from a single winch has been assembled between a wrecker and a casualty. Two of the snatchblocks are anchored to the front of the casualty, creating four lines to the load. The line angle at each snatchblock is measured to be 10°. What is the true mechanical advantage?

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A winching layup has been assembled to pull a casualty with a total calculated resistance of 56,250 lbs. The layup includes two snatchblocks connected to the casualty, resulting in four lines to the load. The line angle at one snatchblock is measured to be 20° and 30° at the other. What will be the load on the winch to place the casualty into motion?

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You’ve been asked to construct a two-leg bridle for the purpose of decking/undecking commercial vehicles. The distance between the lifting pins on the casualty is 32”. What is the minimum length of the bridle leg in order to achieve a 2:1 ratio for veer angle?

A winch line passes through a snatchblock that is connected to a stationary anchor before being terminated at the casualty. The line angle at the stationary snatchblock is measured to be 90°. A load cell in the winching layup indicates a line load of 10,520 lbs. Calculate the force that is being placed upon the stationary anchor.

A two-leg bridle, constructed of 3/8” Grade 8 alloy chain has been connected to the end of a shipping container that is on level ground. The bridle has a veer angle ratio of 2:1. The container is known to weigh 27,400 lbs. If one end of the container is lifted one foot with the bridle, will the chain be within its working load limit?

A steel beam, weighing 18,000 lbs. is on a 15° grade. The low end of the beam needs to lifted vertically to make the beam level. Calculate the force required to lift the low end of the beam.

A screw pin shackle is considered Hard Rigging. Calculate the Ultimate Load Rating for a Screw Pin shackle having a Working Load Rating of 12 Tons.

A Grade 100 Alloy chain has been selected to create a winching bridle. The sling angle of the bridle is measured to be 25°. Is this rigging application commonly recommended for use?

A casualty weighing 22,640 lbs. is located on a 30° grade. Its tires are properly inflated. Its wheels will rotate freely. The casualty has no damage. It is located on soft ground. The layup has a mechanical advantage of 1:1. The wire rope is 3/4” Steel Core EIPS, 6 X 19 construction, with a design factor of 4:1. Will the WLL of the wire rope be exceeded when winching the casualty up the grade?

A winching layup has been assembled which includes two snatchblocks connected to the casualty and one snatchblock connected to the wrecker’s tailboard. To prevent damage to the wire rope, the winch should be disengaged when the snatchblocks on the casualty are no closer than _____” from the snatchblock on the tailboard.

A wrecker with a front axle weight of 16,500 lbs. has been rigged to lift a steel coil. The steel coil weighs 44,000 lbs. There is 340” between the center of the steering axle and the wrecker’s rear stabilizers. The distance between the rear of the stabilizers and the center of the steel coil is 132”. Can the wrecker complete the lift while keeping its steering tires in contact with the ground?

The type of resistance associated with a casualty’s tires, wheels or body making contact with material such as mud is referred to as Damage resistance.

The surface resistance factor or rate for a casualty whose tires and wheels rotate freely and are on soft grass is _____?

When making weight transfer calculations, the operator always calculates weight transfer from the front of the casualty to the rear of the casualty.

A casualty is located on a 15° grade. The entire casualty is observed to be mired to body depth. What percentage of the casualty’s weight needs to be moved in order to winch it up the grade?

Winching a casualty down a grade requires the operator to add a percentage of the casualty’s static weight to the surface resistance to compensate for gradient resistance.

To prevent wire rope damage and to achieve optimal efficiency of the wire rope, an operator should select a snatchblock having a minimum tread diameter of no less than 12 times the diameter of the wire rope.

An operator can expect a center-drive style winch to pull with MORE force or LESS force when loaded with four layers of wire rope as opposed to one layer?

After completing a Total Resistance calculation, the resistance value is divided by the Ultimate Load Rating (UL) or Breaking Strength (MBS) of the wire rope being used to determine the required number of lines to the load.

Identify the term that refers to the percentage of a casualty’s weight that needs to be moved.

The pulling force of a center-drive style winch can change depending upon the number of layers of wire rope that have been gathered onto the winch. What is the greatest amount of force an operator should ever choose to place on a wire rope?

A benefit of maintaining 2:1 veer angle for rigging is:

OSHA requires the use of high visibility safety apparel for which of the following personnel while working on or near a roadway?

The publication that provides detail in matters such as traffic control at minor incidents, high visibility safety apparel and placement of temporary traffic control devices is referred to as _____________?

Calculate the Tow Capacity of a tandem axle tow truck equipped with a 25-ton recovery boom. The distance from the centerline between the drive axles to the center of the underlift fork receiver is 128”. The distance from the centerline of the steering axle to the centerline between the drive axles is 290”. The drive axles of the wrecker weight 24,000 lbs. The steering axle weighs 14,000 lbs.

You, the towing operator, are always responsible for your own actions.

Within the context of air cushion recovery for loaded, commercial combination vehicles, the use of a low pressure air cushion under a truck cab for the purpose of up-righting is a questionable practice.

After completing the recovery a disabled unit, an operator should perform a walk-around inspection before towing the disabled vehicle from the scene.

For casualties with static weights greater than 26,000 lbs., rigging attachments should be to the frame during recovery operations.

It is an acceptable practice to step over a wire rope that is under tension.

When towing a dual tire/wheel equipped casualty from the front, it is a questionable practice to tow the unit with a flat inside tire.

Placing yourself between the rear of a wrecker and the front of a casualty to direct the operator into position for a lift and tow operation is an acceptable practice.

The boom elevation function on most hydraulic wreckers is designed to bypass or stall before damage to the recovery boom occurs.

During which circumstance is it acceptable for a towing and recovery operator to use a tow truck to close a lane of traffic?

As the temperature of hydrualic fluid increases beyond its specified temperature range, which of the following occurs?

With the PTO engaged and the engine idling on a hydraulic wrecker, the hydraulic fluid will:

Rear spades on a heavy-duty wrecker can be used to:

The landing legs of your client’s 53 ft. van trailer, laden with 44,000 lbs. of cargo has sunken through an asphalt parking lot. The most acceptable practice while vertically lifting with a hydraulic wrecker includes which of the following?

The survey of a incident involving a tractor and trailer reveals the following findings. The casualty’s gross combination weight is 68,000 lbs. The passenger side tires are in a soft ditch, mired to wheel depth. The driver side tires are at the edge of the pavement. The wrecker is positioned 75 feet in front of the casualty and offset by one truck width. The wiching lines are secured to the front of the tractor. Which of the following results is most likely when the winches are engaged?

A heavy-duty wrecker, returning from an incident recovery with a tractor and 53 ft. trailer in tow, makes a right hand turn. The trailer will:

The survey of a casualty reveals that a winching method is required to recover it to level ground. A lack of space prevents optimal positioning of the wrecker in line with the casualty. Which of the following methods will NOT enhance the side-pulling performance of the heavy-duty wrecker?

An operator is preparing to upright an overturned single-axle tank truck. The tank has a 2,000 gallon capacity and is filled with 1,000 gallons of water. Which of the following actions will contribute to a safer recovery of the casualty?

Upon arriving at the scene of an overturned commercial vehicle you observe that the casualty has blocked the entire roadway. After introducing yourself to the law enforcement officer in charge, you are asked to hurry up and clear the interstate highway as quickly as possible. Which of the following are acceptable practices in this circumstance?

A propane tanker is safest to handle when it is:

A tractor and trailer has overturned on flat, level ground. The static weight of the casualty is 80,000 lbs. Assuming the center of gravity is located in the center of the combination, a force equal to ________ is required to begin uprighting the casualty.

When positioning a rotator wrecker on a bridge to execute a recovery, an informed operator would consider making which of the following calculations?

What percentage of a wrecker’s uladen steering axle weight should be retained to safely lift and tow?

A concrete mixer, loaded with 9 cubic yards of concrete is mired to body depth on a job site. The response time to the incident is one hour. Upon arriving at the incident site, an informed operator would consider doing which of the following first?

A survey reveals that a tractor and loaded refrigerated trailer has rolled backward down a grade at a truck stop. The trailer is loaded with 43,000 lbs. of produce. The trailer tires are on soft ground. The landing legs have broken through the pavement. The tractor’s tires are on the paved surface. The tractor is in line with the trailer. Which of the following is the most favorable positioning for heavy-duty wrecker(s) to recover the combination vehicle?

A survey reveals that a commercial motor vehicle has overturned on its right side. The driver of the CMV has been taken from the scene by ambulance. An informed operator would consider which of the following actions prior to uprighting the casualty?

Your client has requested that your recover their D-6 CAT Dozer equipped with a 4-way blade. The dozer is mired to idler depth in soft clay mud. Which of the following rigging solutions represents best practice for this type of recovery?

When deploying long lengths of wire rope from a winch, what is the minimum number of wraps of wire rope that must be left on the winch drum prior to engaging the winch?

Which of the following would be the most capable anchor/deadman?

The survey of an overturned, loaded 53′ trailer reveals structural damage to the trailer’s upper rail. Which of the following actions would contribute to enhanced stability of the trailer during the recovery?

A shipping container, 40 feet in length has overturned on level ground. It has a center of gravity located in the center of the container. The chassis has been disconnected from the container and recovered separately. The container will not begin to upright until:

As it pertains to towing and recovery vehicle chassis specifications, the acronym RBM stands for:

A correct step toward effective Traffic Incident Management is to:

Horizontal sling angles of less than 30° are not recommended for use in bridles constructed for horizontal winching or verical lifting because:

You have been dispatched to recover a dump truck, stuck in sand at a construction area. The survey reveals that it is loaded with stone. The only access for the recovery is in front of the casualty. Therefore, it must be winched forward. There are no hooks, shackles or receivers on the front to attach rigging. Which of the following options is the most acceptable solution for attaching a winch line(s) to the casualty?

An MC306, 9,000 gallon capacity fuel tanker has overturned. A replacement tanker has arrived so the fuel can be off-loaded from the casualty. Before off-load pumping begins, an informed operator would first ensure:

An MC331, Propane transport vehicle has overturned and is laying on its side. The vessel is filled to 90% capacity. Approximately what percentage of the liquid propane can be removed through the liquid and (or) vapor valves?