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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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What is low-speed offtracking?
  • 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
  • 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 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 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.
This is a question from page 111 - click here to look up the answer

Quote From Page 0 Of The Illinois 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.
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?
  • 12,300 pounds
  • 34,000 pounds
  • 12,000 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.
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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?
  • 20,000 pounds in Illinois
    12,000 pounds in Indiana
  • 13,000 pounds in Illinois
    12,000 pounds in Indiana
  • 13,000 pounds in Illinois
    13,000 pounds in Indiana
  • 20,000 pounds in Illinois
    13,000 pounds in Indiana
This is a question from page 112 - click here to look up the answer

Quote From Page 0 Of The Illinois 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 will alter the gross vehicle weight?
  • Sliding the trailer tandems
  • Sliding the tractor 5th wheel
  • Moving the cargo toward the rear of the trailer
  • Adding more fuel to the tanks
This is a question from page 112 - click here to look up the answer

Quote From Page 0 Of The Illinois 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.

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Next
You weigh the truck immediately before and after fueling. Based on the following, determine what percentage of the weight goes to each set of axles:

Before fueling:
steer: 11,100, drives: 32,600, gross: 71,400
After fueling:
steer:11,850, drives: 32,850, gross: 72,400
  • 80% went on the steer axle
    20% went on the drive axle
  • 65% went on the steer axle
    35% went on the drive axles
  • 75% went on the steer axle
    25% went on the drive axles
  • 67% went on the steer axle
    33% went on the 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:

To determine the percentage of fuel weight added to the steer axle, take the weight added to the steer axle, divide it by the total fuel weight added (determined by the change in the gross weight), and then multiply that times 100

TruckingTruth's Advice:

To determine the percentage of fuel weight added to the steer axle, take the weight added to the steer axle (750 pounds), divide it by the total fuel weight added (1000 pounds), and then multiply that times 100

750/1000 = .75

.75 * 100 = 75% fuel weight to the steer tires

100% - 75% = 25% went on the drive axles.
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Next
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 back 3 holes
    4 inch spacing - slide tandems back 5 holes
  • 6 inch spacing - slide tandems back 2 holes
    4 inch spacing - slide tandems back 4 holes
  • 6 inch spacing - slide tandems forward 3 holes
    4 inch spacing - slide tandems forward 5 holes
  • 6 inch spacing - slide tandems forward 2 holes
    4 inch spacing - slide tandems forward 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:

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).
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Next
What is the primary goal of implementing the Bridge Formula?
  • 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 over-length trucks from becoming a hazard on narrow bridges and tight roadways
  • To prevent putting too much weight on a relatively small area, causing damage to road surface and bridge structure.
This is a question from page 111 - click here to look up the answer

Quote From Page 0 Of The Illinois 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
Based on the following figures, how much fuel can you legally add while remaining legal on the drive axles?

Percentage of fuel weight to drive axles: 30%
Weight Before Fueling: Steer: 11,275, drives: 33,750, gross: 77,220
  • 104.16 gallons of fuel
  • 110 gallons of fuel
  • 112.75 gallons of fuel
  • 88.5 gallons of fuel
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 drive axles, you can use this formula to calculate the amount of fuel you can take on:

TruckingTruth's Advice:

We know that 30% of the weight of fuel will go to the drive axles and you have 250 pounds you can add to the weight of the drive axles and remain legal. So plugging these numbers into the formula, you get:

250/30 = 8.33
8.33x100 = 833
833/8 = 104.13 gallons of fuel you can add
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Finish
Please select an option
[4,1,2,4,3,1,4,1]
8

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