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CDL Practice Test: Weight & Balance

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CDL Practice Test: Weight & Balance

Weight & Balance Questions

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Good Luck!

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
  • 12,000 pounds
  • 12,300 pounds
  • 20,000 pounds
This is a question from page 110 - click here to look up the answer

Quote From Page 0 Of The Illinois 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.
Next
You receive a scale ticket and your drive axles are 35,400 and your trailer tandems are 31,100. Based upon the two most common tandem slider rail hole spacings, what is the minimum number of holes you would have to slide the tandems to get the weight legal, and in which direction?
  • 6 inch spacing - slide tandems back 5 holes
    4 inch spacing - slide tandems back 7 holes
  • 6 inch spacing - slide tandems forward 4 holes
    4 inch spacing - slide tandems forward 6 holes
  • 6 inch spacing - slide tandems back 4 holes
    4 inch spacing - slide tandems back 6 holes
  • 6 inch spacing - slide tandems forward 5 holes
    4 inch spacing - slide tandems forward 7 holes
This is a question from page 113 - click here to look up the answer

Quote From Page 0 Of The Illinois 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:

With 35,400 pounds on the drive axles you must move a minimum of 1,400 pounds off the drive axles. To shift weight off the drive axles and onto the trailer tandems, you slide the trailer tandems forward toward the front of the truck.

With 6 inch spacing you're moving 400 pounds per hole so you need to move 4 holes to shift a minimum of 1,400 pounds (400 x 4 = 1,600).

With 4 inch spacing you're moving 250 pounds per hole so you need to move 6 holes to shift a minimum of 1,400 pounds (250 x 6 = 1,500).
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Next
Where will the weight of fuel be distributed?
  • Mostly to your steer axle, with some going onto the drive axles.
  • Mostly to your drive axles, with some going onto the steer axle.
  • Entirely on your steer axle
  • Entirely on your drive axles
This is a question from page 115 - click here to look up the answer

Quote From Page 0 Of The Illinois CDL Manual:

The weight of the fuel in your tanks will be distributed mostly to your steer axle, with some going onto the drive axles.
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Next
Which of the following are not a primary factor affecting weight distribution across the axles?
  • The position of the trailer's tandems
  • All of these factors affect the weight distribution across the axles
  • The amount of fuel onboard and the placement of the fuel tanks
  • The position of the tractor's 5th wheel
This is a question from page 112 - click here to look up the answer

Quote From Page 0 Of The Illinois 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
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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 amount of fuel you have onboard
  • The distance from the drive axles to the trailer tandems
  • The distance between the locking pin holes
This is a question from page 113 - click here to look up the answer

Quote From Page 0 Of The Illinois 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.
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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?
  • 12,000 pounds
  • 12,300 pounds
  • 15,500 pounds
  • 20,000 pounds
This is a question from page 112 - click here to look up the answer

Quote From Page 0 Of The Illinois 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.

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Next
If unsure of the exact location of the center of gravity of your cargo, where would you rather have the center of gravity located if you couldn't get it centered?
  • A little closer to the front than to the rear
  • About 15 feet behind the tractor drive axles
  • About 5-10 feet in front of the trailer tandems
  • Directly centered above the trailer tandems
This is a question from page 114 - click here to look up the answer

Quote From Page 0 Of The Illinois CDL Manual:

If unsure of the exact location of the center of gravity of your cargo, you'd rather have the load a little closer to the front than to the rear. You can slide the trailer tandems forward as far as you would like to compensate for too much weight on the nose of the trailer, but the kingpin to trailer tandem length limitations will prevent you from going too far back with your trailer tandems.

TruckingTruth's Advice:

A lot of times you'll be loading mixed cargo which will make it quite difficult to determine the exact center of gravity of the load. So when you're making your best guess, try to make sure it's a little forward of the center point between the drive axles and trailer tandems. That will give you the best chance of being able to adjust the trailer tandems so that the load will be legal.
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Next
Ideally, where would you like the cargo's center of gravity located?
  • About 10 feet to the rear the center point of the trailer
  • Roughly centered between the steer axle and the trailer tandems
  • Just slightly behind the tractor's drive axles
  • Centered between your drive axles and your trailer tandems.
This is a question from page 114 - click here to look up the answer

Quote From Page 0 Of The Illinois CDL Manual:

You'll want to have the cargo loaded into the trailer so that the center of gravity is centered between your drive axles and your trailer tandems.

TruckingTruth's Advice:

If the center of gravity of the cargo is too far to the front or rear of the vehicle, it is entirely possible that you will not be able to get your axle weights legal without reloading the cargo itself.
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