Official CDL Test – ONLINE CDL SCHOOL

Online CDL Test

This test evaluates your readiness to pass the official Commercial Driver’s License (CDL) exam, ensuring you have the knowledge needed to operate safely and legally as a professional truck driver. A solid understanding of CDL requirements helps drivers avoid violations, improve safety, and enhance career opportunities.

Topics Covered:

General knowledge, air brakes, and combination vehicle rules
Pre-trip inspection procedures and vehicle control fundamentals
Hazardous materials regulations and endorsements
Hours of Service (HOS) compliance and logbook requirements
Traffic laws, road safety, and defensive driving techniques

Passing this test demonstrates your ability to meet CDL standards and operate with professionalism and skill.

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1.

What will help a drunk sober up?

Fresh air

Time

A glass of water

Coffee

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2. What is the main reason to perform a vehicle inspection?

To make sure your paint is not chipped

Employer liability

Safety

To check the cleanliness of your vehicle

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3. You don’t want to be a distracted driver, so you

avoid using your cell phone until you reach your destination.

smoke, eat, and drink only on straight portions of the road.

have all your emotionally difficult conversations in the first hour of driving.

read maps or use your phone only when there are no other vehicles around you.

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4. To maintain alertness during your trip, you should

do all of the above.

schedule your trip for the daytime hours.

avoid medications that cause drowsiness.

get 8–9 hours of sleep beforehand.

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5.

What is the penalty for driving a commercial motor vehicle (CMV) without a CDL?

A fine of up to $2,000 and mandatory jail time

A fine of up to $1,000 and possible jail time

A fine of at least $5,000 and possible jail time

A fine of up to $5,000 or possible jail time

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6. Which of the following should you check during your trip?

Mirrors

Pressure gauges

All of the above

Cargo covers

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7. What is a common cause of tire fires?

Underinflated tires

Overinflated tires

Cold tires

All of the above

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8. How can you determine if your vehicle is equipped with an anti-lock braking system (ABS)?

Check for a yellow ABS malfunction lamp on the instrument panel.

Look for wheel speed sensor wires that are coming from the rear of your brakes.

All of the above can work.

Check if your vehicle was manufactured after March 1, 1998. (Such vehicles are required to have the panel light.)

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9. How many tie-downs are required for a 20-foot load?

2

3

4

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10. If the engine is not overheated, is it completely safe to remove the radiator cap?

Yes, as long as there is no overflow.

Yes.

No

Yes, as long as the radiator isn't damaged.

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11. An anti-lock braking system (ABS) will

keep your wheels from locking when you brake hard.

increase your stopping distance.

increase your vehicle's stopping power.

let you drive faster.

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12. How many reflective warning triangles must you carry with you for emergencies?

5

3

4

2

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13.

Letting the air out of hot tires

will have no effect at all.

is a bad idea because when the tires cool off, the pressure will be too low.

will cool them down. You will be able to continue your trip sooner.

is a good idea because the extra pressure will be relieved.

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14. Which of these is NOT part of the basic method for shifting up?

Pushing in the clutch and shifting into a higher gear at the same time

Releasing the clutch

Accelerating while pressing the clutch and turning toward the driver's side

Releasing the clutch and pressing the accelerator at the same time

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15. If you are confronted by an aggressive driver, you should

avoid eye contact.

call the police from your cell phone if you can do it safely.

ignore rude gestures and refuse to react negatively.

do all of the above.

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16. Which of the following are parts of the suspension system?

Bearing plate

Pitman arm

Lock ring

All of the above

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17. If you’re driving a vehicle with an automatic transmission, when should you downshift?

If you feel you're driving too fast

If you start to get drowsy

If you're going down a steep downgrade

When your engine speed increases

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18. In which of the following two situations should you downshift?

Starting down a hill and finishing a curve

Starting up a hill and finishing a curve

Starting up a hill and entering a curve

Starting down a hill and entering a curve

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19. Total stopping distance equals

Reaction distance + braking distance + signal distance.

Reaction distance + braking distance.

Perception distance + reaction distance + braking distance.

Perception distance + reaction distance.

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20. It has just reached freezing. Which of the following areas may be slippery?

All of the above

A shaded area

A bridge

A wet-looking road

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21.

Which of the following are safe ways to communicate with others?

All of the above

Flashing your headlights at night when you're about to pass

Tapping your horn when it's legal and you're about to pass

Flashing your brake lights when you're about to slow down

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22. You should put the starter switch key into your pocket while you perform the pre-trip inspection because

it could damage the starting mechanism.

any of the above could occur.

someone could steal the truck.

someone could start and move the truck.

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23. On which of the following types of fires should you NOT use a B:C fire extinguisher?

Grease

Gasoline

Wood

Electrical

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24. How do you test a vehicle’s hydraulic brakes for leaks?

Pump the brakes 3 times. Then apply firm pressure for 5 seconds.

Pump the brakes 5 times. Then apply firm pressure for 3 seconds.

Pump the brakes 3 times. Then apply firm pressure for 10 seconds.

Apply firm pressure for 5 seconds. Then pump the brakes 3 times.

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25. Which of the following are serious traffic violations that may cause you to lose your CDL privileges?

Talking on a cell phone

All of the above

Playing music too loudly

Traveling at 15 mph or more above the posted speed limit

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26. What is the best way to figure out how many seconds of following distance you have?

Send a text message to a friend to text you back in ten seconds. See how far you have traveled in that time.

Wait until the vehicle ahead of you passes a shadow or landmark. Then count the seconds until you reach it.

Use the stopwatch on your cell phone to determine how long it takes you to reach a mile marker after the vehicle in front of you has passed it.

Get 1/4 closer to the car in front of you, then back off again. Multiply how long this took you by four to give the following distance.

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27. The minimum tread depth for tires other than the front tires is

4/32 inch.

1 inch.

2/32 inch.

8/32 inch.

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28. For how long will you lose your CDL privileges if you are convicted of a second DUI offense?

Life

Three years minimum

Ten years minimum

Five years minimum

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29. The most important hand signal you should agree on with a helper is

“Stop.”

“Turn up the music.”

“Go.”

“Faster.”

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30. How long does it take a typical tractor-trailer to clear a double railroad track?

10 seconds

More than 30 seconds

14 seconds

More than 15 seconds

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31. What are the main differences between aggressive driving and road rage?

All of the above

Whether it's intentional

The outcome of the situation

The level of anger

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32. What is the best way to check what is happening behind and to the sides of your vehicle?

Just turn your head and look at your blind spots.

Adjust your mirrors before you start your trip and check them regularly.

Stop every 50 miles and look around.

Check your reflection in other vehicles.

Your score is

The average score is 26%

0%