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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!

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 back 7 holes - 33,750 drive axles - 32,550 trailer tandems
  • Slide tandems forward 6 holes - 33,750 drive axles - 32,550 trailer tandems
  • Slide tandems back 6 holes - 33,950 drive axles - 32,350 trailer tandems
  • Slide tandems forward 7 holes - 33,950 drive axles - 32,350 trailer tandems
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 35,700 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).

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 hole structure of the trailer tandem slider rail
  • The center of gravity of the cargo
  • The kingpin to trailer tandem length limitations
This is a question from page 114 - click here to look up the answer

Quote From Page 0 Of The Illinois 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
Adding or burning off fuel will mainly change the amount of weight on which axles?
  • Drive axles and somewhat on your trailer tandems
  • Drive axles only
  • Trailer tandems only
  • Steer axle and somewhat on your 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:

Adding or burning off fuel will mainly change the amount of weight on your steer axle and somewhat on your drive axles

TruckingTruth's Advice:

Most of the weight of the fuel will go on your steer axle. The percentage of weight distributed between your steer and drive axles with regard to fuel will depend on the placement of your fuel tanks.
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Next
What are the Federal standards for the gross vehicle weight of a 5 axle commercial vehicle?
  • 80,000 pounds
  • 22,000 pounds
  • 65,000 pounds
  • 60,000 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
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Next
Which of the following techniques will not change the weight distribution across your axles?
  • Adding or burning off fuel
  • Raising the center of gravity height of the load
  • Changing the weight distribution of the cargo along the length of the trailer
  • Sliding your trailer tandems forward or backward
This is a question from page 110 - click here to look up the answer

Quote From Page 0 Of The Illinois 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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Next
If you slide the 5th wheel toward the nose of the tractor, what will be the effect?
  • 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 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 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
Sliding your trailer tandems forward or backward will redistribute the weight mainly between which two sets of axles?
  • Steer axle and drive axles
  • None of these answers are correct
  • Steer axle and trailer tandems
  • Drive axles and 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:

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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Next
What is the correct method of determining what percentage of fuel is distributed between the steer axle and the drive axles?
  • Weigh the truck immediately after fueling, then run exactly 100 miles, and then re-weigh the truck to see what percentage of the added weight came off the steer axles.
  • Weigh the truck, then immediately fuel up, and then immediately re-weigh the truck to see what percentage of the added weight went to the steer axle, and what percentage went to the drive axles.
  • Weigh the truck after running 100 miles, then immediately fuel up, and then re-weigh the truck to see what percentage of the added weight went to the steer axle, and what percentage went to the drive axles.
  • Weigh the truck, then drive exactly 100 miles, and then re-weigh the truck to see what percentage of the added weight went to the steer axle, and what percentage went to 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:

In order to accurately determine what percentage of fuel weight goes to your steer axle versus your drive axles you can simply weight the truck, then immediately fuel up, and then immediately re-weigh the truck to see what percentage of the added weight went to the steer axle, and what percentage went to the drive axles.
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