CDL Practice Tests For Weight Distribution Page 2

Weight Distribution Practice Questions

Click On The Picture To Begin

Good Luck!

Adding or burning off fuel will mainly change the amount of weight on which axles?
  • Drive axles only
  • Steer axle and somewhat on your drive axles
  • Trailer tandems only
  • Drive axles and somewhat on your trailer tandems
Click here to look up the answer

From The CDL Manual

Adding or burning off fuel will mainly change the amount of weight on your steer axle and somewhat on your drive axles

TruckingTruth's Advice:

Most of the weight of the fuel will go on your steer axle. The percentage of weight distributed between your steer and drive axles with regard to fuel will depend on the placement of your fuel tanks.
Next
What is the main factor that will limit how far back you can slide your tandems?
  • The load rating of your drive tires
  • The maximum legal length allowed between your trailer kingpin and your trailer tandems
  • The distance between your steer axle and drive axles or "tractor length rating"
  • The overall height to length ratio of the cargo in the trailer
Click here to look up the answer

From The CDL Manual

The maximum legal length allowed between your trailer kingpin and your trailer tandems will limit how far back you can slide your tandems

TruckingTruth's Advice:

Different states have different laws regarding the maximum length allowed from your kingpin to your trailer tandems and you can look up these values in the Rand McNally Motor Carrier's Atlas
Prev
Next
You have steer tires rated at 6,150 pounds each, and you're in the state of West Virginia which says the legal limit for the steer axle is 20,000 pounds. What's the maximum legal weight you can carry on your steer axle in West Virginia?
  • 34,000 pounds
  • 12,300 pounds
  • 12,000 pounds
  • 20,000 pounds
Click here to look up the answer

From The CDL Manual

When distributing weight across a set of axles, you will ultimately be limited by the most restrictive law for any given situation. For instance, if the law states that you can carry 20,000 pounds on your steer axle, but your steer tires have a load rating of 6000 pounds each, then you can only carry a total of 12,000 pounds on your steer axle

TruckingTruth's Advice:

Your steer tires are rated at 6,150 pounds and you have two of them on your steer axle. Therefore you can carry a total of 12,300 pounds (6,150 x 2) on your steer axle. Because you can not legally exceed the load rating of your tires, the fact that West Virginia allows 20,000 pounds on the steer axle doesn't matter. You're ultimately limited by the most restrictive law, which in this case is related to exceeding the steer tire load rating.
Prev
Next
What are the two primary laws governing the placement of the tandems?
  • The tire load rating of the drive axle tires and the minimum clearance law
  • The maximum width of 8' 6" on Interstate Highways and the maximum trailer length law
  • The Bridge Formula and the maximum allowed length from Kingpin to trailer tandems.
  • The overall gross weight of the vehicle and the maximum percentage of weight on trailer tandems
Click here to look up the answer

From The CDL Manual

The two primary laws governing the placement of the tandems are the Bridge Formula and the maximum allowed length from Kingpin to trailer tandems.
Prev
Next
Why did Congress enacted the Bridge Formula in 1975?
  • To prevent over-width trucks from becoming a hazard on narrow bridges
  • To limit the weight-to-length ratio of a vehicle crossing a bridge.
  • To prevent the maximum tire load rating from being exceeded by narrow axle spacing
  • To regulate the building of bridge structures so they can support the weight of heavy modern trucks
Click here to look up the answer

From The CDL Manual

Congress enacted the Bridge Formula in 1975 to limit the weight-to-length ratio of a vehicle crossing a bridge.
Prev
Next
What is the primary goal of implementing the Bridge Formula?
  • To prevent over-length trucks from becoming a hazard on narrow bridges and tight roadways
  • To prevent overloading the trailer tandems and exceeding the load rating of the trailer tires
  • To increase the minimum strength of bridges, allowing for heavier gross vehicle weights which improves efficiency
  • To prevent putting too much weight on a relatively small area, causing damage to road surface and bridge structure.
Click here to look up the answer

From The CDL Manual

The idea (of implementing the bridge formula) was to prevent putting too much weight on a relatively small area, causing damage to road surface and bridge structure.

TruckingTruth's Advice:

A bridge is designed to handle a certain number of pounds per square inch on the surface. By creating the Bridge Formula, Congress made sure that too much weight wasn't concentrated on a small area of a bridge, causing damage to the bridge structure.
Prev
Next
What is low-speed offtracking?
  • When making a high speed turn, the momentum carried by the trailer will cause it to swing wide and possibly outside the lane of travel
  • When a trailer's tandem axles are slightly out of alignment, the rear of the trailer will track off to one side or another instead of directly behind the tractor
  • When a combination vehicle makes a low-speed turn the wheels of the rearmost trailer axle follow a path several feet inside the path of the tractor steering axle.
  • When taking off from a dead stop, the initial torque of the engine on the drivetrain will cause a slight offtracking of the tractor which could be a hazard to other traffic
Click here to look up the answer

From The CDL Manual

When a combination vehicle makes a low-speed turn - for example a 90-degree turn at an intersection - the wheels of the rearmost trailer axle follow a path several feet inside the path of the tractor steering axle. This is called low-speed offtracking.
Prev
Next
What is the main factor affecting the low-speed offtracking of a tractor trailer?
  • The ratio of the length of the tractor to the length of the trailer
  • The distance from the trailer kingpin to the center of the trailer rear axle
  • The length of the trailer, regardless of the position of the trailer tandems
  • The distance from the steer axle to the drive axles
Click here to look up the answer

From The CDL Manual

When a combination vehicle makes a low-speed turn - for example a 90-degree turn at an intersection - the wheels of the rearmost trailer axle follow a path several feet inside the path of the tractor steering axle. This is called low-speed offtracking. Excessive low-speed offtracking may make it necessary for the driver to swing wide into adjacent lanes to execute the turn (that is, to avoid climbing the inside curbs or striking fixed objects like telephone poles).

This performance attribute is affected primarily by the distance from the trailer kingpin to the center of the trailer rear axle, otherwise known as the wheelbase of the semitrailer. To prevent trucks from being too long to maneuvering safely around turns encountered in cities and towns, the maximum length allowed from the kingpin to the trailer tandems is set by the individual states.

Prev
Next
What is the maximum legal weight for the drive axles or trailer tandems?
  • 12,000 pounds
  • 34,000 pounds
  • 26,000 pounds
  • 20,000 pounds
Click here to look up the answer

From The CDL Manual

The legal weight limits for each set of axles is:

  • Steer axle varies by state
  • 34,000 for the drive axles
  • 34,000 for the trailer tandems
Prev
Next
In Oregon, the maximum weight on the steer axle is listed as 600 pounds per inch of tire tread width up to 20,000 pounds. Your steer tires have a load rating of 6,150 pounds each and are 10 inches wide. What is the maximum legal weight your steer axle can carry in Oregon?
  • 15,500 pounds
  • 20,000 pounds
  • 12,300 pounds
  • 12,000 pounds
Click here to look up the answer

From The CDL Manual

Kentucky has a limit of 700 pounds per inch of tread width. So if you have a 10 inch wide tire tread, you are allowed a maximum of 7,000 pounds per tire (700 pounds per inch x 10 inches wide) or 14,000 pounds total for the steer axle.

TruckingTruth's Advice:

You must find the most restrictive law to determine your maximum legal weight.

The maximum Oregon allows is 20,000 pounds on the steer axle

The load rating on your tires is 6,150, which would put your maximum legal weight at 12,300 pounds regardless of the fact that there are less restrictive laws.

The maximum Oregon allows by weight is 600 pounds per inch. You have 10 inch tires so that would be a maximum of 6000 pounds per tire, or 12,000 pounds on the steer axle, which is the most restrictive of the various laws. Therefore, 12,000 pounds is your legal limit in this truck in Oregon.

Prev
Finish
Please select an option
[2,2,2,3,2,4,3,2,2,4]
10

Join Us!

We have an awesome set of tools that will help you understand the trucking industry and prepare for a great start to your trucking career. Not only that, but everything we offer here at TruckingTruth is 100% free - no strings attached! Sign up now and get instant access to our member's section:
High Road Training Program Logo
  • The High Road Training Program
  • The High Road Article Series
  • The Friendliest Trucker's Forum Ever!
  • Email Updates When New Articles Are Posted

Apply For Paid CDL Training Through TruckingTruth

Did you know you can fill out one quick form here on TruckingTruth and apply to several companies at once for paid CDL training? Seriously! The application only takes one minute. You will speak with recruiters today. There is no obligation whatsoever. Learn more and apply here:

Apply For Paid CDL Training

About Us

TruckingTruth was founded by Brett Aquila (that's me!), a 15 year truck driving veteran, in January 2007. After 15 years on the road I wanted to help people understand the trucking industry and everything that came with the career and lifestyle of an over the road trucker. We'll help you make the right choices and prepare for a great start to your trucking career.

Read More

Becoming A Truck Driver

Becoming A Truck Driver is a dream we've all pondered at some point in our lives. We've all wondered if the adventure and challenges of life on the open road would suit us better than the ordinary day to day lives we've always known. At TruckingTruth we'll help you decide if trucking is right for you and help you get your career off to a great start.

Learn More