Weight Distribution Practice Questions
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What are the four basic weight limits?
- single axle, tandem axle, single tire, eight tire
- single axle, tandem axle, bridge formula, and gross vehicle
- double spacing, single axle, bridge forumula, overweight
- single tire, bridge formula, tri-axle, gross vehicle
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From The CDL Manual
There are four basic weight limits: single axle, tandem axle, bridge formula, and gross vehicle.
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What is the Federal standard for the weight limit on a single axle?
- 20,000 pounds
- 15,000 pounds
- 12,000 pounds
- 22,000 pounds
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From The CDL Manual
- 20,000 pounds single axle weight
- 34,000 pounds tandem axle weight
- 80,000 pounds gross vehicle weight
- Bridge Formula Calculations
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What is the Federal Standard for maximum weight on a tandem axle vehicle?
- 30,000 pounds
- 27,000 pounds
- 34,000 pounds
- 37,000 pounds
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From The CDL Manual
- 20,000 pounds single axle weight
- 34,000 pounds tandem axle weight
- 80,000 pounds gross vehicle weight
- Bridge Formula Calculations
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What are the Federal standards for the gross vehicle weight of a 5 axle commercial vehicle?
- 22,000 pounds
- 65,000 pounds
- 80,000 pounds
- 60,000 pounds
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From The CDL Manual
- 20,000 pounds single axle weight
- 34,000 pounds tandem axle weight
- 80,000 pounds gross vehicle weight
- Bridge Formula Calculations
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What can be the result of too much weight on the back of the trailer?
- The steer tires won't grip properly
- You won't be able to fuel up properly without being overweight
- 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
- The steering will feel "heavy" and sluggish
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From The 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.
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In the following picture, what are axles 2 and 3 commonly referred to as?
- "drives" or "drive axles"
- "duals" or "tractor set"
- "tandems" or "front trailer tandems"
- "drives" or "trailer drives"
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From The 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".
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In the following picture, what are axles 4 and 5 commonly referred to as?
- "back set" or "rear tandems"
- "trailer set" or "back tandems"
- "trailer drives" or "back tandems"
- "tandems" or "trailer tandems"
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From The CDL Manual
#4 and #5 together are your trailer tandem axles (commonly referred to as "tandems" or "trailer tandems")
TruckingTruth's Advice:
You'll generally hear drivers refer to these axles as simply "tandems". They'll say "The load I had yesterday was loaded incorrectly and I was overweight on my 'tandems' ".
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Which of the following techniques will not change the weight distribution across your axles?
- Raising the center of gravity height of the load
- Adding or burning off fuel
- Sliding your trailer tandems forward or backward
- Changing the weight distribution of the cargo along the length of the trailer
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From The CDL Manual
There are several ways to distribute or redistributing the overall weight of the vehicle across the different sets of axles. You will affect weight distribution by:
- Changing the weight distribution of the cargo along the length of the trailer, or moving the cargo around after the truck has been loaded. This will distribute the weight mainly between your drive axles and trailer tandems
- Sliding your trailer tandems forward or backward will redistribute the weight mainly between your drive axles and trailer tandems
- Sliding your 5th wheel will redistribute the weight mainly between your steer axle and your drive axles
- Adding or burning off fuel will mainly change the amount of weight on your steer axle and somewhat on your drive axles also, depending upon the placement of your fuel tanks.
TruckingTruth's Advice:
If you move the center of gravity either toward the front or rear of the trailer, it will change the weight distribution across the axles. But raising or lowering the center of gravity of the load will not change its weight distribution across the axles.
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Sliding your trailer tandems forward or backward will redistribute the weight mainly between which two sets of axles?
- Steer axle and drive axles
- Steer axle and trailer tandems
- None of these answers are correct
- Drive axles and trailer tandems
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From The CDL Manual
Sliding your trailer tandems forward or backward will redistribute the weight mainly between your drive axles and trailer tandems
TruckingTruth's Advice:
You may find a slight change in the weight of your steer axle after sliding your tandems, but it won't be very much and it's rarely much of a concern.
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Sliding your 5th wheel will redistribute the weight mainly between which two sets of axles?
- Drive axles and trailer tandems
- Steer axle and drive axles
- Steer axle and trailer tandems
- Trailer tandems and rear axles
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From The 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
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