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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!

What are the Federal standards for the gross vehicle weight of a 5 axle commercial vehicle?
  • 60,000 pounds
  • 22,000 pounds
  • 80,000 pounds
  • 65,000 pounds
This is a question from page 109 - click here to look up the answer

Quote From Page 0 Of The Illinois CDL Manual:

  • 20,000 pounds single axle weight
  • 34,000 pounds tandem axle weight
  • 80,000 pounds gross vehicle weight
  • Bridge Formula Calculations
Next
If you slide the 5th wheel toward the nose of the tractor, what will be the effect?
  • You will increase the weight on the steer axle and take weight off the drive axles
  • You will decrease the weight on the steer axle and it will have no effect on the drive axles
  • You will decrease the weight on the steer axle and take weight off the drive axles
  • You will increase the weight on the steer axle and increase the weight on the drive axles
This is a question from page 118 - click here to look up the answer

Quote From Page 0 Of The Illinois CDL Manual:

If you slide the 5th wheel toward the nose of the tractor you will increase the weight on the steer axle and take weight off the drive axles.
Prev
Next
What can be the result of too much weight on the back of the trailer?
  • The steering will feel "heavy" and sluggish
  • A "pendulum effect" causing the rear of the trailer to sway back and forth while driving down the highway or jackknife going around a curve
  • You won't be able to fuel up properly without being overweight
  • The steer tires won't grip properly
This is a question from page 109 - click here to look up the answer

Quote From Page 0 Of The Illinois CDL Manual:

Too much weight toward the back of the trailer can lead to a "pendulum effect", causing the rear of the trailer to sway back and forth while driving down the highway or jackknife going around a curve

TruckingTruth's Advice:

Balancing the weight of your truck properly across the axles is a legal requirement because there are so many safety factors involved.
Prev
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
    13,000 pounds in Indiana
  • 13,000 pounds in Illinois
    12,000 pounds in Indiana
  • 20,000 pounds in Illinois
    12,000 pounds in Indiana
  • 13,000 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

Prev
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
  • Leverage
  • Center of gravity
This is a question from page 114 - click here to look up the answer

Quote From Page 0 Of The Illinois 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
Using the following numbers for your calculations, how much weight will come off your steer axle?

Miles per gallon: 7
Miles travelled: 280
Percenatage of fuel weight on steer axle: 80%
  • 256 pounds
  • 280 pounds
  • 310 pounds
  • 300 pounds
This is a question from page 117 - click here to look up the answer

Quote From Page 0 Of The Illinois CDL Manual:

To calculate the percentage of a value, you simply multiply the total value times the percentage you're looking for, and then divide by 100.

TruckingTruth's Advice:

If you're getting 7 miles per gallon and you travel 280 miles:

280/7 = 40 gallons of fuel

40 gallons x 8 pounds per gallon = 320 pounds of total fuel burned off

Since 80% of the weight of fuel goes on our steer axle, we need to know what 80% of 320 is:

80 x 320 / 100 = 256 pounds coming off the steer axle
Prev
Next
Which of the following will alter the gross vehicle weight?
  • Moving the cargo toward the rear of the trailer
  • Sliding the trailer tandems
  • Adding more fuel to the tanks
  • Sliding the tractor 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 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
What is the primary goal of implementing the Bridge Formula?
  • To increase the minimum strength of bridges, allowing for heavier gross vehicle weights which improves efficiency
  • To prevent putting too much weight on a relatively small area, causing damage to road surface and bridge structure.
  • To prevent over-length trucks from becoming a hazard on narrow bridges and tight roadways
  • To prevent overloading the trailer tandems and exceeding the load rating of the trailer tires
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
Finish
Please select an option
[3,1,2,2,3,1,3,2]
8

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