CDL Practice Tests For Weight Distribution Page 3

Weight Distribution Practice Questions

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California allows 20,000 pounds maximum on the steer axle. The tread width of your tires is 11 inches, and the load rating on your steer tires is 7000 pounds. How much weight can you carry on your steer axle in California?
  • 14,000 pounds
  • None of these are correct
  • 12,000 pounds
  • 20,000 pounds
Click here to look up the answer

From The CDL Manual

Even if they allow 14,000 pounds on the steer axle, you have to have tires that are rated to carry that much weight. If your steer tires have a tire load limit of 6,000 pounds each, you can only carry 12,000 pounds on your steer axle, regardless of state laws.

TruckingTruth's Advice:

We have to find the most restrictive law to determine our maximum weight.

California allows up to 20,000 pounds on the steer axle

There is no requirement based upon tread width in California, so the width of your steer tires is irrelevant for this example

Your steer tires have a maximum load rating of 7,000 pounds each, which would therefore limit your legal steer axle weight to 14,000 pounds. This is the most restrictive of the laws, so 14,000 pounds is your legal weight limit in this case.

Next
You're in Illinois which allows up to 20,000 pounds on the steer axle. You're heading to Indiana which only allows 12,000 on the steer axle. Your steer tires have a load rating of 6,500 pounds each. What is the maximum legal weight your steer axle can be for each of the two states?
  • 13,000 pounds in Illinois
    12,000 pounds in Indiana
  • 20,000 pounds in Illinois
    12,000 pounds in Indiana
  • 20,000 pounds in Illinois
    13,000 pounds in Indiana
  • 13,000 pounds in Illinois
    13,000 pounds in Indiana
Click here to look up the answer

From The CDL Manual

Keep in mind though - even if they allow 14,000 pounds on the steer axle, you have to have tires that are rated to carry that much weight. If your steer tires have a tire load limit of 6,000 pounds each, you can only carry 12,000 pounds on your steer axle, regardless of state laws.

TruckingTruth's Advice:

We have to find the most restrictive law for each state.

Illinois

Allows 20,000 pounds on the steer axle

Your tire load rating of 6,500 means your maximum legal weight is 13,000 pounds on the steer axle.

The 13,000 pounds is the most restrictive for Illinois

Indiana

Indiana allows 12,000 on the steer axle

Your tire load rating of 6,500 means your maximum legal weight is 13,000 pounds on the steer axle.

The 12,000 pound limit imposed by Indiana on the steer axle is the most restrictive for Indiana

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Next
Which of the following are not a primary factor affecting weight distribution across the axles?
  • The position of the tractor's 5th wheel
  • The position of the trailer's tandems
  • The amount of fuel onboard and the placement of the fuel tanks
  • All of these factors affect the weight distribution across the axles
Click here to look up the answer

From The CDL Manual

The primary factors which will affect the weight distribution across a truck's axles are:

  • The position of the trailer's tandems
  • The position of the tractor's 5th wheel
  • The overall weight of the cargo in the trailer and the horizontal (front-to-back) position of its center of gravity
  • The amount of fuel onboard and the placement of the fuel tanks
Prev
Next
Which of the following has the greatest affect on the gross vehicle weight?
  • The position of the tractor's 5th wheel
  • The position of the trailer's tandems
  • None of these affect the gross vehicle weight at all
  • Moving the cargo toward the front or rear of the trailer
Click here to look up the answer

From The CDL Manual

The final key point to understand when it comes to weight transfer is that none of the methods of redistributing weight between the different sets of axles, including sliding your 5th wheel, sliding your tandems, or moving the cargo around will have any affect on your gross weight.

TruckingTruth's Advice:

The only way to affect the gross vehicle weight is to add or remove weight from the vehicle. The methods of weight transfer we've discussed will move weight from one area of the vehicle to another, but will not affect the gross weight of the vehicle itself.
Prev
Next
Which of the following will alter the gross vehicle weight?
  • Sliding the tractor 5th wheel
  • Adding more fuel to the tanks
  • Sliding the trailer tandems
  • Moving the cargo toward the rear of the trailer
Click here to look up the answer

From The CDL Manual

The final key point to understand when it comes to weight transfer is that none of the methods of redistributing weight between the different sets of axles, including sliding your 5th wheel, sliding your tandems, or moving the cargo around will have any affect on your gross weight.

The only way to affect the gross vehicle weight would be to add or remove weight from the vehicle. Adding or burning off fuel, or adding or removing cargo would be two examples of ways to alter the gross vehicle weight.

Prev
Next
Sliding your trailer tandems toward the front or back of the vehicle will primarily change the weight distribution between which sets of axles?
  • It only removes weight from the trailer tandems
  • The steer axle and the trailer tandems
  • The tractor's drive axles and the steer axle
  • The tractor's drive axles and the trailer tandems.
Click here to look up the answer

From The CDL Manual

Sliding your trailer tandems toward the front or back of the vehicle will primarily change the weight distribution between the tractor's drive axles and the trailer tandems.
Prev
Next
What affect will sliding the trailer tandems forward have on the weight distribution?
  • You will take weight off the tractor's drive axles and put more weight on the steer axle
  • You will put more weight on the trailer tandems and take weight off the tractor's drive axles
  • You will put more weight on the steer axle and take weight off the tractor's drive axles
  • You will put less weight on the trailer tandems and put more weight on the tractor's drive axles
Click here to look up the answer

From The CDL Manual

By sliding the trailer tandems forward, you will put more weight on the trailer tandems and take weight off the tractor's drive axles.
Prev
Next
What factor has the greatest affect on how much weight is moved per hole in the tandem slider rail?
  • The center of gravity of the cargo
  • The distance from the drive axles to the trailer tandems
  • The amount of fuel you have onboard
  • The distance between the locking pin holes
Click here to look up the answer

From The CDL Manual

The distance between the locking pin holes on the trailer will be the main factor affecting how much weight is moved per hole. This distance varies between the different trailer manufacturers, and the larger the distance between the holes, the more weight will be shifted with each hole.
Prev
Next
What are the two most common tandem slider rail hole spacings, and roughly how much weight is transferred per hole?
  • 6 inches apart - 250 pounds per hole
    10 inches apart - 500 pounds per hole
  • 6 inches apart - 350 pounds per hole
    8 inches apart - 550 pounds per hole
  • 4 inches apart - 450 pounds per hole
    6 inches apart - 200 pounds per hole
  • 4 inches apart - 250 pounds per hole
    6 inches apart - 400 pounds per hole
Click here to look up the answer

From The CDL Manual

The two main hole spacings you'll find are 4 inches and 6 inches. You can estimate that you will move 250 pounds per hole for 4 inch spacing, and 400 pounds per hole for 6 inch spacing.

TruckingTruth's Advice:

There will be some variance here, but generally speaking these are very good estimates and they work very well. You'll learn to recognize the spacing by glancing at them eventually, but in the beginning you might want to measure quick so you know how far to slide the tandems.
Prev
Next
Your trailer has a 6 inch hole spacing in the tandem slider rail and your trailer tandems are 900 pounds overweight. What is the minimum number of holes you will have to slide the tandems to get the tandems within legal limits?
  • 3 holes
  • 1 hole
  • 4 holes
  • 2 holes
Click here to look up the answer

From The CDL Manual

The two main hole spacings you'll find are 4 inches and 6 inches. You can estimate that you will move 250 pounds per hole for 4 inch spacing, and 400 pounds per hole for 6 inch spacing.

TruckingTruth's Advice:

6 inch hole spacing means you'll move approximately 400 pounds per hole. In order to move a minimum of 900 pounds, you have to move at least 3 holes (400 x 3 = 1200).
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