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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!

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?
  • 1 hole
  • 2 holes
  • 3 holes
  • 4 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:

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).
Next
What factor has the greatest affect on how much weight is moved per hole in the tandem slider rail?
  • The distance from the drive axles to the trailer tandems
  • The amount of fuel you have onboard
  • The center of gravity of the cargo
  • 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.
Prev
Next
Sliding your 5th wheel will redistribute the weight mainly between which two sets of axles?
  • Drive axles and trailer tandems
  • Steer axle and trailer tandems
  • Steer axle and drive axles
  • Trailer tandems and rear axles
This is a question from page 110 - click here to look up the answer

Quote From Page 0 Of The Illinois CDL Manual:

Sliding your 5th wheel will redistribute the weight mainly between your steer axle and your drive axles

TruckingTruth's Advice:

Sliding the 5th wheel will generally have little or no effect on the weight of your trailer tandems
Prev
Next
Based on the following figures, how much fuel can you legally add while remaining legal on the steer axle?

Load rating of steer tires: 6,150 pounds
Percentage of fuel weight to steer axle: 80%
Steer axle weight limit in states you're travelling: 20,000 pounds
Weight Before Fueling: Steer: 11,450, drives: 33,100, gross: 76,700
  • 121.25 gallons
  • 119.5 gallons
  • 146 gallons
  • 132.81 gallons
This is a question from page 116 - click here to look up the answer

Quote From Page 0 Of The Illinois CDL Manual:

Once you know your current axle weights and the percentage of fuel weight that goes on the steer axle, you can use this formula you can calculate the amount of fuel you can take on:

TruckingTruth's Advice:

Because your steer tires are rated at 6,150 and the legal weight limit is 20,000 pounds for the steer axle in the states you're travelling in, the most restrictive law would be to not exceed the tire load rating. In this case, you can have 12,300 on your steer axle. Right now you have 11,450 on your steer axle, which means you can add 850 pounds to your steer axle and still be legal.

Because we know that 80% of the weight of fuel will go to the steer axle and you can add 850 pounds to your steer axle, we can plug the numbers into the formula above.

850/80 = 10.62
10.62 x 100 = 1062
1062/8 = 132.75 gallons of fuel you can add
Prev
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 4 holes
    4 inch spacing - slide tandems back 6 holes
  • 6 inch spacing - slide tandems back 5 holes
    4 inch spacing - slide tandems back 7 holes
  • 6 inch spacing - slide tandems forward 5 holes
    4 inch spacing - slide tandems forward 7 holes
  • 6 inch spacing - slide tandems forward 4 holes
    4 inch spacing - slide tandems forward 6 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).
Prev
Next
Why did Congress enacted the Bridge Formula in 1975?
  • To regulate the building of bridge structures so they can support the weight of heavy modern trucks
  • To prevent the maximum tire load rating from being exceeded by narrow axle spacing
  • 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.
This is a question from page 111 - click here to look up the answer

Quote From Page 0 Of The Illinois CDL Manual:

Congress enacted the Bridge Formula in 1975 to limit the weight-to-length ratio of a vehicle crossing a bridge.
Prev
Next
In the following picture, what are axles 2 and 3 commonly referred to as?
  • "drives" or "trailer drives"
  • "tandems" or "front trailer tandems"
  • "duals" or "tractor set"
  • "drives" or "drive axles"
This is a question from page 110 - click here to look up the answer

Quote From Page 0 Of The Illinois CDL Manual:

#2 and #3 together are your tractor drive tandem axles (commonly referred to as "drives" or "drive axles")

TruckingTruth's Advice:

You'll normally hear drivers refer to these two axles as your "drives". They'll say, "The other day I scaled out and my 'drives' were over by 800 pounds".
Prev
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 distance between your steer axle and drive axles or "tractor length rating"
  • The overall height to length ratio of the cargo in the trailer
  • The maximum legal length allowed between your trailer kingpin and your trailer tandems
This is a question from page 110 - click here to look up the answer

Quote From Page 0 Of The Illinois 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
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