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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!

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?
  • Directly centered above the trailer tandems
  • About 5-10 feet in front of the trailer tandems
  • About 15 feet behind the tractor drive axles
  • A little closer to the front than to the rear
This is a question from page 114 - click here to look up the answer

Quote From Page 0 Of The Illinois 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.
Next
Which of the following are not a primary factor affecting weight distribution across the axles?
  • The position of the tractor's 5th wheel
  • The amount of fuel onboard and the placement of the fuel tanks
  • The position of the trailer's tandems
  • All of these factors affect the weight distribution across the axles
This is a question from page 112 - click here to look up the answer

Quote From Page 0 Of The Illinois CDL Manual:

The primary factors which will affect the weight distribution across a truck's axles are:

  • The position of the trailer's tandems
  • The position of the tractor's 5th wheel
  • The overall weight of the cargo in the trailer and the horizontal (front-to-back) position of its center of gravity
  • The amount of fuel onboard and the placement of the fuel tanks
Prev
Next
Using 7 miles per gallon as your fuel mileage and 8 pounds per gallon for the weight of fuel, how much total fuel weight will you burn off in 210 miles?
  • 270 pounds
  • 240 pounds
  • 210 pounds
  • 180 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 figure out how many gallons of fuel you'll burn off, simply divide the number of miles travelled by the miles per gallon

Number of miles travelled / miles per gallon = gallons of fuel burned off

TruckingTruth's Advice:

210 miles travelled / 7 miles per gallon = 30 gallons of fuel burned off

30 gallons x 8 pounds per gallon = 240 pounds of fuel burned off
Prev
Next
What is the main factor affecting the low-speed offtracking of a tractor trailer?
  • The length of the trailer, regardless of the position of the trailer tandems
  • The distance from the trailer kingpin to the center of the trailer rear axle
  • The distance from the steer axle to the drive axles
  • The ratio of the length of the tractor to the length of the trailer
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. Excessive low-speed offtracking may make it necessary for the driver to swing wide into adjacent lanes to execute the turn (that is, to avoid climbing the inside curbs or striking fixed objects like telephone poles).

This performance attribute is affected primarily by the distance from the trailer kingpin to the center of the trailer rear axle, otherwise known as the wheelbase of the semitrailer. To prevent trucks from being too long to maneuvering safely around turns encountered in cities and towns, the maximum length allowed from the kingpin to the trailer tandems is set by the individual states.

Prev
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 forward 2 holes
    4 inch spacing - slide tandems forward 4 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 3 holes
    4 inch spacing - slide tandems forward 5 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).
Prev
Next
Adding or burning off fuel will mainly change the amount of weight on which axles?
  • Steer axle and somewhat on your drive axles
  • Drive axles and somewhat on your trailer tandems
  • Trailer tandems only
  • Drive axles only
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.
Prev
Next
Where will the weight of fuel be distributed?
  • Entirely on your steer axle
  • Entirely on your drive axles
  • Mostly to your steer axle, with some going onto the drive axles.
  • Mostly to your drive axles, with some going onto the steer axle.
This is a question from page 115 - click here to look up the answer

Quote From Page 0 Of The Illinois CDL Manual:

The weight of the fuel in your tanks will be distributed mostly to your steer axle, with some going onto the drive axles.
Prev
Next
What is the maximum legal weight for the drive axles or trailer tandems?
  • 12,000 pounds
  • 20,000 pounds
  • 34,000 pounds
  • 26,000 pounds
This is a question from page 112 - click here to look up the answer

Quote From Page 0 Of The Illinois CDL Manual:

The legal weight limits for each set of axles is:

  • Steer axle varies by state
  • 34,000 for the drive axles
  • 34,000 for the trailer tandems
Prev
Finish
Please select an option
[4,4,2,2,3,1,3,3]
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