CDL Practice Tests For Weight Distribution Page 4

Weight Distribution Practice Questions

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You receive a scale ticket and your drive axles are 32,200 and your trailer tandems are 35,100. 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 forward 3 holes
    4 inch spacing - slide tandems forward 5 holes
  • 6 inch spacing - slide tandems back 2 holes
    4 inch spacing - slide tandems back 4 holes
  • 6 inch spacing - slide tandems back 3 holes
    4 inch spacing - slide tandems back 5 holes
  • 6 inch spacing - slide tandems forward 2 holes
    4 inch spacing - slide tandems forward 4 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:

With 35,100 pounds on the tandems you must move a minimum of 1,100 pounds off the trailer tandems. To shift weight off the trailer tandems and onto the drive axles, you slide the trailer tandems back toward the rear of the truck.

With 6 inch spacing you're moving 400 pounds per hole so you need to move 3 holes to shift a minimum of 1,100 pounds (400 x 3 = 1,200).

With 4 inch spacing you're moving 250 pounds per hole so you need to move 5 holes to shift a minimum of 1,100 pounds (250 x 5 = 1,250).
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 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 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
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:

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
You receive a scale ticket and your drive axles are 31,700 and your trailer tandems are 35,100. Based upon a trailer with 6 inch slider rail hole spacings, what is the minimum number of holes you would have to slide the tandems to get the weight legal, and what would the final weights be?
  • Slide tandems back 3 holes - 33,900 tandems - 32,900 drives
  • Slide tandems forward 4 holes - 33,300 tandems - 33,100 drives
  • Slide tandems back 4 holes - 33,300 tandems - 33,100 drives
  • Slide tandems forward 3 holes - 33,900 tandems - 32,900 drives
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:

With 35,100 pounds on the trailer tandems you must move a minimum of 1,100 pounds off the trailer tandems. To shift weight off the trailer tandems and onto the drive axles, you slide the trailer tandems back toward the rear of the truck.

With 6 inch spacing you're moving 400 pounds per hole so you need to move 3 holes to shift a minimum of 1,100 pounds (400 x 3 = 1,200).

Prev
Next
You receive a scale ticket and your drive axles are 35,700 and your trailer tandems are 30,600. Based upon a trailer with 4 inch slider rail hole spacings, what is the minimum number of holes you would have to slide the tandems to get the weight legal, and what would the final weights be?
  • Slide tandems forward 7 holes - 33,950 drive axles - 32,350 trailer tandems
  • Slide tandems back 6 holes - 33,950 drive axles - 32,350 trailer tandems
  • Slide tandems back 7 holes - 33,750 drive axles - 32,550 trailer tandems
  • Slide tandems forward 6 holes - 33,750 drive axles - 32,550 trailer tandems
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:

With 35,700 pounds on the drive axles you must move a minimum of 1,700 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 4 inch spacing you're moving 250 pounds per hole so you need to move 7 holes to shift a minimum of 1,700 pounds (250 x 7 = 1,750).

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Next
What is the cargo's center of gravity?
  • The overall length of the cargo after being loaded into the trailer.
  • The center point of the cargo's weight.
  • The average height of the cargo above the trailer floor.
  • The distance from the front of the trailer to the center point of the cargo.
Click here to look up the answer

From The CDL Manual

The center of gravity location of the cargo is the center point of the cargo's weight. In other words, if all of the cargo in your trailer was one solid block, the center of gravity would be the point that the entire block would balance upon like a teeter totter.

TruckingTruth's Advice:

Sometimes you will load 22 pallets that all weigh the same. That makes it simple to determine the center of gravity. But often times you'll have a mixed product and you'll have to look over what's being put on the truck so you can get the weight of the cargo roughly centered between the drive axles and trailer tandems.
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Ideally, where would you like the cargo's center of gravity located?
  • About 10 feet to the rear the center point of the trailer
  • Centered between your drive axles and your trailer tandems.
  • Just slightly behind the tractor's drive axles
  • Roughly centered between the steer axle and the trailer tandems
Click here to look up the answer

From The 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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Next
What will be the ultimate limitation that prevents you from putting the trailer tandems as far to the rear of the trailer as possible?
  • The load rating of the steer tires
  • The kingpin to trailer tandem length limitations
  • The hole structure of the trailer tandem slider rail
  • The center of gravity of the cargo
Click here to look up the answer

From The CDL Manual

The kingpin to trailer tandem length limitations will prevent you from going too far back with your trailer tandems
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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?
  • About 5-10 feet in front of the trailer tandems
  • A little closer to the front than to the rear
  • About 15 feet behind the tractor drive axles
  • Directly centered above the trailer tandems
Click here to look up the answer

From The 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
If you are able to exert 200 pounds of force against an object but you are only exerting 50 pounds of force to do so, what method are you applying to make this happen?
  • Momentum
  • Centrifugal Force
  • Center of gravity
  • Leverage
Click here to look up the answer

From The CDL Manual

Using a lever on an object allows you to exert more force upon the object than the amount of force you're actually exerting against the lever itself. In other words, you might rig a lever that can lift a 250 pound boulder but requires only 50 pounds of force against the lever itself.

TruckingTruth's Advice:

Loading the cargo behind the center point of the trailer tandems exerts leverage against the trailer tandems. You will actually put more weight on the trailer tandems than the cargo loaded behind the trailer tandems actually weighs. At the same time, you'll be taking weight off the drive axles.
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Next
Where in the trailer could you place cargo so that the weight applied to the trailer tandems is greater than the weight of the cargo itself?
  • Directly above the drive axles
  • Slightly in front of the halfway point between the tractor drives and trailer tandems
  • Directly above the front axle of the trailer tandems
  • In the overhang portion of the trailer behind the center point of the trailer tandems
Click here to look up the answer

From The CDL Manual

Because the trailer pivots up and down at the kingpin above the drive axles, the floor of the trailer acts as a lever pushing down against the trailer tandems when freight is loaded into the overhang portion of the trailer. The further back you load the freight into the overhang portion of the trailer, the more leverage it creates. The net effect of this leverage is that you're putting more weight on the trailer tandems than the cargo itself weighs, and you will actually take a little bit of weight off the drive axles at the same time.
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