CDL Practice Tests: Dominate The CDL Exam!

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Question #102 (1 of 10)

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If someone is tailgating you, which of following is a bad idea:

  • Increase following distance
  • Avoid quick lane changes
  • Avoid tricks
  • Stab the brakes one time quickly to alert the driver behind you he's too close

If you are being tailgated, do the following to reduce the chances of a crash:

  • Avoid quick changes. If you have to slow down or turn, signal early and reduce speed gradually.
  • Increase your following distance. Opening up room in front of you will help you avoid having to make sudden speed or direction changes. It also makes it easier for the tailgater to get around you.
  • Do not speed up. It is safer to be tailgated at a low speed than a high speed.
  • Avoid tricks. Do not turn on your taillights or flash your brake lights. Follow the suggestions above.
I believe the most important thing a professional driver can do for safety is to maintain a large following distance. Give yourself a ton of space in front of your vehicle and you'll have more time to react in an emergency.
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Question #301 (2 of 10)

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Which of the following statements are true about the parking brake control knob?

  • None of these are correct
  • Push the parking brake control knob in to apply the parking brakes and pull it out to release. The control will be a yellow, diamond-shaped knob labeled “parking brakes” on newer vehicles.
  • Pull the parking brake control knob out to apply the parking brakes and push it in to release. The control will be a yellow, diamond-shaped knob labeled “parking brakes” on newer vehicles.
  • Pull the parking brake control knob out to apply the parking brakes and push it in to release. The control will be a red, octagon-shaped knob labeled “trailer air supply” on newer vehicles.
Pull the parking brake control knob out to apply the parking brakes and push it in to release. The control will be a yellow, diamond-shaped knob labeled “parking brakes” on newer vehicles.
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Question #517 (3 of 10)

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When checking the steering box components under the hood, what should you check for?

  • Look for any missing nuts, bolts and cotter keys
  • All these are correct
  • Check for power steering fluid leaks or damage to power steering hoses
  • Check that the steering box is securely mounted and not leaking

Steering Box/Hoses

  • Check that the steering box is securely mounted and not leaking. Look for any missing nuts, bolts and cotter keys.
  • Check for power steering fluid leaks or damage to power steering hoses.
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Question #253 (4 of 10)

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What is a stop light switch?

  • A switch that activates a fuel increase for pulling away from a dead stop, like at stop lights or stop signs.
  • It's a switch inside the tractor's fuel tanks that shuts off the fuel pumps when the tanks are nearly full
  • An electric switch that works by air pressure. The switch turns on the brake lights when you put on the air brakes.
  • A switch that turns off the running lights when the brake lights are activated

5.1.12 – Stop Light Switch

Drivers behind you must be warned when you put your brakes on. The air brake system does this with an electric switch that works by air pressure. The switch turns on the brake lights when you put on the air brakes.

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Question #587 (5 of 10)

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You start driving for the day at 6:00 am. How long can you drive before you must take a 30-minute break?

  • Until 2:00 pm
  • Until 10:00 am
  • Until 11:00 am
  • Until 12:00 pm
There are times when you will be required to take a 30-minute break. If you drive 8 consecutive hours with no breaks, you are not allowed to drive a CMV until a 30-minute break is taken. You may perform other on-duty tasks but you cannot drive. The 30-minute break can be taken as an off-duty break or it can also be satisfied during a time period of performing on-duty tasks. It can also be taken as a combination of on-duty and off-duty time. It could also be satisfied in the sleeper berth. Any combination of the three could suffice for a legal break. You could take 15 minutes on duty time fueling, then another 15 minutes off duty to run into the truck stop to relieve your bladder and purchase a snack and a drink. That would legally suffice for your 30-minute break.
You must take a 30 minute break from driving after 8 consecutive hours of driving. Remember, you can meet the 30-minute break requirement by using any combination of on-duty time, off-duty time, or sleeper berth. You can not drive again until you've gone 30 consecutive minutes without driving.
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Question #823 (6 of 10)

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A steel coil weighing 21,000 lbs requires how much securement against forward movement?

  • 10,000 lbs
  • 10,500 lbs
  • 21,000 lbs
  • 16,800 lbs
  • The forward force (80% of the cargo weight) represents braking while driving straight ahead.
  • The rearward force (50% of the cargo weight) represents vehicle acceleration or braking in reverse.
  • The side-to-side or lateral force (50% of the cargo weight) represents traveling on a curve, ramp or changing lanes.
  • The vertical force (20% of the cargo weight)) represents cargo vibration during transport. This requirement is satisfied when the cargo is "Fully Contained"
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Question #512 (7 of 10)

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When doing an emergency system check on air brake systems, how do you begin the test?

  • Turn electrical power off and begin fanning off the air pressure by rapidly applying and releasing the foot brake
  • Turn off the electrical power and begin fanning off the air pressure by pulling out the red parking brake knob
  • Turn the engine on and begin fanning off the air pressure by rapidly applying and releasing the foot brake
  • Turn electrical power on and begin fanning off the air pressure by rapidly applying and releasing the foot brake
Emergency System Check. Turn electrical power on and begin fanning off the air pressure by rapidly applying and releasing the foot brake. Low air warning devices (buzzer, light, other) should activate before air pressure drops below 60 psi. Continue to fan off the air pressure. Normally within the range of 20-45 psi on a tractor-trailer combination vehicle, the tractor parking valve and parking brake valve should close (pop out). On other combination vehicle types and single vehicle types, the parking brake valve should close (pop out).
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Question #674 (8 of 10)

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Sliding the 5th wheel will change the weight distribution almost exclusively between which sets of axles?

  • The steer axle and the trailer tandems
  • The steer axle and the drive axles
  • The steer axle is the only one affected by fuel
  • The drive axles and the trailer tandems
Sliding the 5th wheel will change the weight distribution almost exclusively between the steer axle and the drive axles.
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Question #180 (9 of 10)

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The A:B:C type fire extinguisher is designed to work on:

  • plastics and recyclables
  • Electrical fires and burning liquids, burning wood, paper, and cloth
  • metals or combustible gases
  • wood, paper, or cardboard
The A:B:C type is designed to work on burning wood, paper and cloth as well as electrical fires and burning liquids
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Question #288 (10 of 10)

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Describe controlled braking:

  • Apply the brakes as hard as you can without locking the wheels. Keep steering wheel movements very small while doing this. If you need to make a larger steering adjustment or if the wheels lock, release the brakes. Re-apply the brakes as soon as you can.
  • Apply the brakes as hard as you can so that the wheels lock. Keep the wheels locked and the steering wheel movements very small while doing this. If you need to make a larger steering adjustment, release the brakes. Re-apply the brakes as soon as you can.
  • None of these are correct
  • Turn the wheel while applying the brakes hard enough to lock the drive tires. The drive tires locking will produce more grip on the roadway, giving you more braking force and more control.

Controlled Braking. With this method, you apply the brakes as hard as you can without locking the wheels. Keep steering wheel movements very small while doing this. If you need to make a larger steering adjustment or if the wheels lock, release the brakes. Re-apply the brakes as soon as you can.

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CDL Practice Tests

Our CDL practice tests are designed to help test your knowledge of the CDL Manual and sharpen your skills for taking the CDL permit and endorsement exams. They are not designed to teach you the knowledge necessary to pass the exams. Please do not try to memorize CDL practice tests in order to get your CDL. There's a better way.

Our High Road CDL Training Program is by far the easiest and most effective way to learn the materials necessary for passing your written CDL exams and preparing for a great start to your career. We strongly suggest using the High Road (which is 100% free!) to learn the CDL manual before using our CDL practice questions to test your knowledge.

How to Pass CDL Permit Test the First Time

The Class A CDL permit exam consists of a multiple choice test covering 20 different areas related to commercial driving. To prepare for this test, it is important to do practice tests beforehand. Knowing your personal study habits, getting enough rest, and eating a healthy breakfast will also set you up for success.

Tips For Passing the Commercial Driver's License (CDL) Permit Test

  • Practice Makes Perfect: The best way to both mentally and physically prepare for the written exam is to take practice tests. Start out with open-book tests and gradually work your way up to giving yourself a time limit. Finally, before the big day, take a practice exam as if it were the real thing without any help. This will give you a good indication of how well you understand the material.
  • Understand Instead of Memorize: Memorizing information can be helpful for the written exam, but the key to being fully prepared is to understand the material rather than just memorizing it. Understanding the material will allow you to answer questions correctly no matter how they are worded.
  • Real World Applications: When struggling to understand concepts, create real-world scenarios to make the information more relevant to your life. Doing this will make it easier to remember come test time.
  • Utilize Study Strategies: Utilizing study strategies such as flashcards, songs, rhymes, and phrases can help you remember the material.
  • Be Fresh and Alert: The night before the exam, get a good night's sleep and eat a filling breakfast on the morning of the exam. This will ensure you are fresh and alert to take your exam.
  • Begin Early and Space out Your Studying: It is important to give yourself ample time before the exam to get familiar with the material and get your mind ready for the big day. Consider taking a training course online or in-person, if it's required. Shop around for a course that works best for you.
  • By following these tips, you will be well prepared for your written CDL exam and on your way to a successful career.

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