#1 CDL Practice Test General Knowledge for ALL 50 States – 2022 Update

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To help you prepare for the CDL General Knowledge test, we have created this practice test consisting of 50 questions. Each question is worth two points for a total of 100 possible points. A passing score is 80%. We have created both a General Knowledge Practice Quiz and a General Knowledge Practice Test.

The General Knowledge Practice Quiz reveals the correct answer during each question to help you study for the actual General Knowledge test. The General Knowledge Practice Test doesn’t reveal the correct answers until the test is over. The questions and answers are given in random order each time you retake the test. When you are finished testing, simply click on the “Get Results” button to see your test results. Clicking on the blue “List” button will reveal a list of all the questions you answered correctly and incorrectly. To take the test again, just refresh your browser window. It’s that easy.

Press the start button to begin your free General Knowledge Practice Quiz. Good luck!

General Knowledge CDL Practice Quiz

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Congratulations! You have completed the General Knowledge CDL Practice Quiz. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rated as %%RATING%%

Your answers are highlighted below.

Question 1

The most important reason for conducting a pre-trip inspection of your vehicle is:

A	to help ensure the vehicle will make it to your destination.
B	because it is a requirement for all drivers.
C	because law enforcement may inspect your vehicle on the road.
D	to ensure safety for yourself, your passengers, and other drivers.

Question 2

The trailer hand valve (also called the trolley valve or Johnson bar) should only be used when:

A	it is absolutely necessary.
B	you will be parked for a short time.
C	there is ice and snow, to prevent skidding.
D	testing the trailer brakes after hooking up to a trailer.

Question 3

A pre-trip inspection should be completed:

A	whenever you stop to refuel.
B	at least once a week.
C	before operating the vehicle.
D	if any problems occurred the last the time the vehicle was operated.

Question 4

Your stopping distance will increase by ______, if you double your speed.

A	three times
B	four times
C	half
D	two times

Question 5

Due to its size, if your vehicle cannot make a right turn without swinging into another lane, you should ______ to prevent others from passing you on the right.

A	start the turn, then back up to re-position
B	turn wide before you start the turn
C	turn right and drive over the curb
D	turn wide as you complete the turn

Question 6

The correct term for a long commercial vehicle's tendency to swing wide on turns is:

A	slidetracking.
B	sidetracking.
C	fishtailing.
D	offtracking.

Question 7

Serious vehicle skids are usually caused by:

A	driving too fast for road conditions.
B	poorly adjusted brakes.
C	driving too slow for road conditions.
D	bad tires.

Question 8

The amount of liquid to load into a tank depends on:

A	neither of these.
B	the weight of the liquid.
C	both of these.
D	the legal weight limits.

Question 9

When you are driving at night, you should:

A	drink coffee or other caffeine products to help keep you awake.
B	make sure you are driving slow enough so you can stop within the range of your headlights in case of an emergency.
C	keep your high beams on at all times.
D	roll down your window so that the fresh air will help keep you awake.

Question 10

The reason placards are used is:

A	to warn others of hazardous materials.
B	to combat terrorism.
C	to avoid mixing hazmat with food.
D	to make your vehicle look official.

Question 11

When driving on a slippery road during the day, how much space should you keep ahead of your truck?

A	The same amount of space you would on a dry road.
B	More space than is needed for ideal driving conditions.
C	One vehicle length for every 10,000 lb. of gross vehicle weight.
D	The same amount of space you would at night.

Question 12

Which of the following fires can be safely extinguished by water?

A	Electrical fire.
B	None of these fires can be safely extinguished by water.
C	Grease fire.
D	Gasoline fire.

Question 13

The two driving conditions in which you should downshift are:

A	before going up a hill and before entering a curve.
B	before starting down a hill and before entering a curve.
C	before starting down a hill and before entering a tunnel.
D	before starting down a hill and before going up a hill.

Question 14

When checking the adjustment on air brakes, slack adjusters should have ______ of travel.

A	two inches
B	one half inch
C	one inch
D	three inches

Question 15

A trailer is more likely to swing around when the trailer wheels lock up when:

A	the trailer is fully loaded or very heavy.
B	the trailer is being hauled at high speed.
C	the trailer is out of brake adjustment.
D	the trailer is empty or lightly loaded.

Question 16

The two main causes of tire fires are ______ and ______.

A	dual tires that touch, hot road surfaces
B	poor-quality retreads, under-inflated tires
C	under-inflated tires, dual tires that touch
D	over-heated brakes, under-inflated tires

Question 17

What three things add up to the total stopping distance for your vehicle?

A	Perception distance, response distance, and reaction distance.
B	Observation distance, reaction distance, and slowing distance.
C	Perception distance, reaction distance, and braking distance.
D	Perception distance, slowing distance, and braking distance.

Question 18

The minimum tread depth that front tires should have for safety is:

A	4/32-inch in every major groove.
B	5/32-inch in every major groove.
C	3/32-inch in every major groove.
D	2/32-inch in every major groove.

Question 19

What happens as a person's Blood Alcohol Concentration (BAC) goes up?

A	All of these things happen.
B	The drinker's brain is increasingly affected.
C	Muscle control and coordination are affected.
D	Judgment and self-control are the first to be affected.

Question 20

Whenever you are parked at the side of the road at night, you must do which of the following?

A	Keep your low beam lights on.
B	Turn on your 4-way emergency flashers to warn other drivers.
C	Warn other drivers by using your left turn signal lights.
D	Put your warning devices out within 15 minutes.

Question 21

You are operating a new truck with a manual transmission and are about to drive down a long, steep downhill grade? What should you do?

A	Use a lower gear than you would use to climb the hill.
B	Shift the truck into neutral and coast down the hill to save gas.
C	Use the same gear you would use to climb the hill.
D	Use a higher gear than you would use to climb the hill.

Question 22

Two main things to look for up ahead while driving are ______ and ______.

A	law enforcement officers, detours
B	truck stops, gas stations
C	tunnels, overpasses
D	vehicles, traffic signs

Question 23

Before backing under, when coupling a semi-trailer to your tractor, the trailer is at the right height when:

A	it will be raised slightly when the tractor is backed under it.
B	the kingpin is about 1¼ inches above the fifth wheel.
C	the end of the kingpin is at waist level.
D	the end of the kingpin is even with the top of the fifth wheel.

Question 24

Before transporting a sealed load, it is important to check that the:

A	placard numbers match the seal numbers.
B	seal is authentic.
C	load is properly secured.
D	seal is secure.

Question 25

When loading cargo, what is an important rule to remember?

A	Load more cargo toward the front of the truck for a full load.
B	Load cargo toward the rear of the truck for easier unloading.
C	Load more weight over the drive axle for better traction.
D	Load cargo weight evenly over all the axles.

Question 26

When a coolant container is part of a pressurized system, you can:

A	check the coolant level of a hot engine.
B	safely remove the radiator cap and add coolant while the engine is hot.
C	use only water in the cooling system.
D	use windshield washer fluid as coolant.

Question 27

While doing the pre-trip inspection on your vehicle's steering and exhaust system you found the following problems. Which one, if any, should be fixed before you drive the vehicle?

A	Oil on the tie rod.
B	Play in the steering wheel of more than ten degrees (two inches on a 20-inch steering wheel).
C	Play in the steering wheel of more than five degrees.
D	Too many vertical stacks.

Question 28

Rust around a lug nut is a sign that:

A	the lug nut needs to be replaced.
B	the lug nut is loose.
C	the wheel needs cleaning.
D	the lug nut is cheap.

Question 29

When backing your vehicle, why should you use a helper?

A	To watch for steering errors.
B	To prevent others from distracting you.
C	To see the blind spots you can't see.
D	To direct traffic away from you.

Question 30

Two things a driver can do to prevent a rollover are, to go slow around turns, and also:

A	downshift into the turn.
B	check to make sure that the brakes are properly balanced.
C	keep the cargo as close to the ground as possible.
D	keep two hands firmly planted on the steering wheel at all times.

Question 31

Containerized loads are:

A	exempt from height restrictions.
B	exempt from hazardous materials restrictions.
C	exempt from weight limit restrictions.
D	generally used when freight is carried part way by rail or ship.

Question 32

With regard to safe driving, what does communicating mean?

A	Using turn signals, 4-way flashers, headlights, and the horn.
B	Using a helper when backing up.
C	Using hand signals.
D	Using your CB radio or cell phone to inform others.

Question 33

How many red reflective triangles should be in your vehicle's emergency equipment?

A	A minimum of two.
B	A minimum of one.
C	A minimum of four.
D	A minimum of three.

Question 34

How much stopping distance does a light, empty truck require, compared to the same truck fully loaded and heavy?

A	The same amount of stopping distance.
B	Shorter stopping distance.
C	It depends on what mood you are in at the time.
D	Greater stopping distance.

Question 35

Any flatbed load must have at least ______ tie downs.

A	three
B	one
C	two
D	four

Question 36

You are exiting a highway using an offramp that curves downhill and you are driving a heavy vehicle. What should you do?

A	Turn on your four-way flashers as you approach the offramp.
B	Slow to a safe speed before the curve.
C	Downshift after you are in the curve.
D	Nothing, because the posted speed limit for the offramp is usually 10 miles per hour below the safe speed limit for the offramp.

Question 37

______ can cause a fire.

A	under inflated tires
B	eating spicy food in the truck cab
C	both loose fuel connections and under inflated tires
D	loose fuel connections

Question 38

One reason why dry bulk tanks require special care is because:

A	a dry bulk tank should only be filled halfway.
B	the load should not get wet.
C	the load can catch fire easily.
D	the load can shift.

Question 39

Which of the following methods should you use to test hydraulic brakes for leaks?

A	Pump the brake pedal 5 times; push the pedal firmly 3 seconds; the pedal should not move.
B	Pump the brake pedal 3 times; push the pedal firmly 5 seconds; the pedal should not move.
C	Move forward slowly and push firmly on the brake pedal.
D	Push the brake pedal firmly 5 seconds; listen for leaks.

Question 40

Why should know the outage needed for the liquids you carry?

A	Because it's good to know that information.
B	Because some of the heaviest liquids don’t need any.
C	Because some liquids expand more than others when they get warm.
D	Because tank baffles are not always legal with outage.

Question 41

Your ______ are the most important way to see the sides and rear of your vehicle.

A	rolled down windows
B	sunglasses
C	mirrors
D	rear view cameras

Question 42

The braking power of the spring brakes:

A	decreases when the service breaks are hot.
B	increases when the service brakes are hot.
C	depends on the service brakes being in adjustment.
D	is not affected by the condition of the service brakes.

Question 43

When driving a slow-moving vehicle on a 2-lane highway, you must pull off at the first safe turnout when the number of vehicles behind you is:

A	three or more.
B	none of these.
C	five or more.
D	seven or more.

Question 44

If your vehicle has a retarder, you should turn it off when:

A	you are driving on hilly, rural roads.
B	road conditions are excellent.
C	the road is wet, icy, or snow covered.
D	you are driving on the freeway.

Question 45

You should make emergency plans when you see a hazard because:

A	you want to have a plan to communicate the risk.
B	you want to avoid doing something all of a sudden.
C	you want to have time to act before it turns into an emergency.
D	it is a federal law.

Question 46

You know your brakes are fading when:

A	the brake pedal feels firm when you apply pressure.
B	there is a slight vibration when you press down on the brake pedal.
C	you have to push harder and harder to get the same stopping power on a downgrade.
D	you release pressure on the brake pedal and speed increases.

Question 47

If you become sleepy while driving, you should:

A	stop to sleep.
B	slap yourself in the face three times.
C	roll down the windows.
D	turn up the radio.

Question 48

Which of the following is considered a hazard?

A	Pedestrians and bicyclists.
B	A stopped transit bus.
C	Road construction zones.
D	All of these are considered a hazard.

Question 49

Wheel bearing seals should be checked for ______.

A	rubbing
B	leaks
C	rust
D	burning

Question 50

Empty trucks ______.

A	require greater stopping distance than full trucks
B	need less space ahead than full trucks
C	have better traction when stopping than full trucks
D	have the same stopping distance as full trucks

Once you are finished, click the button below. Any items you have not completed will be marked incorrect. Get Results

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Remember, the General Knowledge Practice Test doesn’t reveal the correct answers until the test is over. The questions and answers are given in random order each time you retake the test. When you are finished testing, simply click on the “Get Results” button to see your test results. Clicking on the blue “List” button will reveal a list of all the questions you answered correctly and incorrectly. To take the test again, just refresh your browser window.

Press the start button to begin your free General Knowledge Practice Test. Good luck!

General Knowledge CDL Practice Test

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Congratulations! You have completed the General Knowledge CDL Practice Test. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rated as %%RATING%%

Your answers are highlighted below.

Question 1

Before backing under, when coupling a semi-trailer to your tractor, the trailer is at the right height when:

A	the end of the kingpin is even with the top of the fifth wheel.
B	it will be raised slightly when the tractor is backed under it.
C	the kingpin is about 1¼ inches above the fifth wheel.
D	the end of the kingpin is at waist level.

Question 2

The braking power of the spring brakes:

A	increases when the service brakes are hot.
B	decreases when the service breaks are hot.
C	is not affected by the condition of the service brakes.
D	depends on the service brakes being in adjustment.

Question 3

Which of the following methods should you use to test hydraulic brakes for leaks?

A	Pump the brake pedal 5 times; push the pedal firmly 3 seconds; the pedal should not move.
B	Push the brake pedal firmly 5 seconds; listen for leaks.
C	Pump the brake pedal 3 times; push the pedal firmly 5 seconds; the pedal should not move.
D	Move forward slowly and push firmly on the brake pedal.

Question 4

Serious vehicle skids are usually caused by:

A	driving too fast for road conditions.
B	driving too slow for road conditions.
C	bad tires.
D	poorly adjusted brakes.

Question 5

______ can cause a fire.

A	underinflated tires
B	loose fuel connections
C	overinflated tires
D	both loose fuel connections and under inflated tires

Question 6

The reason placards are used is:

A	to warn others of hazardous materials.
B	to avoid mixing hazmat with food.
C	to make your vehicle look official.
D	to combat terrorism.

Question 7

How much stopping distance does a light, empty truck require, compared to the same truck fully loaded and heavy?

A	Shorter stopping distance.
B	It depends on what mood you are in at the time.
C	Greater stopping distance.
D	The same amount of stopping distance.

Question 8

You are operating a new truck with a manual transmission and are about to drive down a long, steep downhill grade? What should you do?

A	Shift the truck into neutral and coast down the hill to save gas.
B	Use the same gear you would use to climb the hill.
C	Use a higher gear than you would use to climb the hill.
D	Use a lower gear than you would use to climb the hill.

Question 9

While doing the pre-trip inspection on your vehicle's steering and exhaust system you found the following problems. Which one, if any, should be fixed before you drive the vehicle?

A	Oil on the tie rod.
B	Too many vertical stacks.
C	Play in the steering wheel of more than five degrees.
D	Play in the steering wheel of more than ten degrees (two inches on a 20-inch steering wheel).

Question 10

Containerized loads are:

A	exempt from height restrictions.
B	exempt from hazardous materials restrictions.
C	exempt from weight limit restrictions.
D	generally used when freight is carried part way by rail or ship.

Question 11

With regard to safe driving, what does communicating mean?

A	Using turn signals, 4-way flashers, headlights, and the horn.
B	Using a helper when backing up.
C	Using hand signals.
D	Using your CB radio or cell phone to inform others.

Question 12

What happens as a person's Blood Alcohol Concentration (BAC) goes up?

A	Judgment and self-control are the first to be affected.
B	Muscle control and coordination are affected.
C	The drinker's brain is increasingly affected.
D	All of these things happen.

Question 13

Which of the following is considered a hazard?

A	All of these are considered a hazard.
B	Pedestrians and bicyclists.
C	Road construction zones.
D	A stopped transit bus.

Question 14

Why should know the outage needed for the liquids you carry?

A	Because tank baffles are not always legal with outage.
B	Because some liquids expand more than others when they get warm.
C	Because some of the heaviest liquids don’t need any.
D	Because it's good to know that information.

Question 15

When backing your vehicle, why should you use a helper?

A	To direct traffic away from you.
B	To see the blind spots you can't see.
C	To prevent others from distracting you.
D	To watch for steering errors.

Question 16

If your vehicle has a retarder, you should turn it off when:

A	road conditions are excellent.
B	the road is wet, icy, or snow covered.
C	you are driving on hilly, rural roads.
D	you are driving on the freeway.

Question 17

Whenever you are parked at the side of the road at night, you must do which of the following?

A	Turn on your 4-way emergency flashers to warn other drivers.
B	Put your warning devices out within 15 minutes.
C	Warn other drivers by using your left turn signal lights.
D	Keep your low beam lights on.

Question 18

The correct term for a long commercial vehicle's tendency to swing wide on turns is:

A	offtracking.
B	sidetracking.
C	fishtailing.
D	slidetracking.

Question 19

Any flatbed load must have at least ______ tie downs.

A	four
B	one
C	two
D	three

Question 20

The two driving conditions in which you should downshift are:

A	before starting down a hill and before going up a hill.
B	before going up a hill and before entering a curve.
C	before starting down a hill and before entering a curve.
D	before starting down a hill and before entering a tunnel.

Question 21

When a coolant container is part of a pressurized system, you can:

A	safely remove the radiator cap and add coolant while the engine is hot.
B	check the coolant level of a hot engine.
C	use only water in the cooling system.
D	use windshield washer fluid as coolant.

Question 22

You know your brakes are fading when:

A	you have to push harder and harder to get the same stopping power on a downgrade.
B	you release pressure on the brake pedal and speed increases.
C	there is a slight vibration when you press down on the brake pedal.
D	the brake pedal feels firm when you apply pressure.

Question 23

If you become sleepy while driving, you should:

A	stop to sleep.
B	turn up the radio.
C	slap yourself in the face three times.
D	roll down the windows.

Question 24

The most important reason for conducting a pre-trip inspection of your vehicle is:

A	to ensure safety for yourself, your passengers, and other drivers.
B	to help ensure the vehicle will make it to your destination.
C	because it is a requirement for all drivers.
D	because law enforcement may inspect your vehicle on the road.

Question 25

When driving on a slippery road during the day, how much space should you keep ahead of your truck?

A	The same amount of space you would at night.
B	One vehicle length for every 10,000 lb. of gross vehicle weight.
C	More space than is needed for ideal driving conditions.
D	The same amount of space you would on a dry road.

Question 26

The minimum tread depth that front tires should have for safety is:

A	4/32-inch in every major groove.
B	2/32-inch in every major groove.
C	3/32-inch in every major groove.
D	5/32-inch in every major groove.

Question 27

You are exiting a highway using an offramp that curves downhill and you are driving a heavy vehicle. What should you do?

A	Downshift after you are in the curve.
B	Nothing, because the posted speed limit for the offramp is usually 10 miles per hour below the safe speed limit for the offramp.
C	Slow to a safe speed before the curve.
D	Turn on your four-way flashers as you approach the offramp.

Question 28

Your ______ are the most important way to see the sides and rear of your vehicle.

A	rear view cameras
B	sunglasses
C	rolled down windows
D	mirrors

Question 29

Wheel bearing seals should be checked for ______.

A	leaks
B	burning
C	rubbing
D	rust

Question 30

Rust around a lug nut is a sign that:

A	the lug nut needs to be replaced.
B	the lug nut is cheap.
C	the wheel needs cleaning.
D	the lug nut is loose.

Question 31

Before transporting a sealed load, it is important to check that the:

A	seal is secure.
B	load is properly secured.
C	seal is authentic.
D	placard numbers match the seal numbers.

Question 32

One reason why dry bulk tanks require special care is because:

A	the load can catch fire easily.
B	the load should not get wet.
C	the load can shift.
D	a dry bulk tank should only be filled halfway.

Question 33

How many red reflective triangles should be in your vehicle's emergency equipment?

A	A minimum of two.
B	A minimum of four.
C	A minimum of three.
D	A minimum of one.

Question 34

The two main causes of tire fires are ______ and ______.

A	dual tires that touch, hot road surfaces
B	under-inflated tires, dual tires that touch
C	poor-quality retreads, under-inflated tires
D	over-heated brakes, under-inflated tires

Question 35

Empty trucks ______.

A	require greater stopping distance than full trucks
B	have better traction when stopping than full trucks
C	need less space ahead than full trucks
D	have the same stopping distance as full trucks

Question 36

Which of the following fires can be safely extinguished by water?

A	Grease fire.
B	None of these fires can be safely extinguished by water.
C	Electrical fire.
D	Gasoline fire.

Question 37

When you are driving at night, you should:

A	drink coffee or other caffeine products to help keep you awake.
B	roll down your window so that the fresh air will help keep you awake.
C	make sure you are driving slow enough so you can stop within the range of your headlights in case of an emergency.
D	keep your high beams on at all times.

Question 38

When driving a slow-moving vehicle on a 2-lane highway, you must pull off at the first safe turnout when the number of vehicles behind you is:

A	three or more.
B	seven or more.
C	none of these.
D	five or more.

Question 39

What three things add up to the total stopping distance for your vehicle?

A	Perception distance, slowing distance, and braking distance.
B	Observation distance, reaction distance, and slowing distance.
C	Perception distance, reaction distance, and braking distance.
D	Perception distance, response distance, and reaction distance.

Question 40

Two things a driver can do to prevent a rollover are, to go slow around turns, and also:

A	keep the cargo as close to the ground as possible.
B	keep two hands firmly planted on the steering wheel at all times.
C	check to make sure that the brakes are properly balanced.
D	downshift into the turn.

Question 41

A trailer is more likely to swing around when the trailer wheels lock up when:

A	the trailer is out of brake adjustment.
B	the trailer is being hauled at high speed.
C	the trailer is empty or lightly loaded.
D	the trailer is fully loaded or very heavy.

Question 42

Your stopping distance will increase by ______, if you double your speed.

A	three times
B	two times
C	half
D	four times

Question 43

You should make emergency plans when you see a hazard because:

A	you want to avoid doing something all of a sudden.
B	you want to have time to act before it turns into an emergency.
C	you want to have a plan to communicate the risk.
D	it is a federal law.

Question 44

The amount of liquid to load into a tank depends on:

A	both of these.
B	the weight of the liquid.
C	neither of these.
D	the legal weight limits.

Question 45

Due to its size, if your vehicle cannot make a right turn without swinging into another lane, you should ______ to prevent others from passing you on the right.

A	turn wide before you start the turn
B	turn right and drive over the curb
C	start the turn, then back up to re-position
D	turn wide as you complete the turn

Question 46

When checking the adjustment on air brakes, slack adjusters should have ______ of travel.

A	two inches
B	three inches
C	one inch
D	one half inch

Question 47

The trailer hand valve (also called the trolley valve or Johnson bar) should only be used when:

A	testing the trailer brakes after hooking up to a trailer.
B	it is absolutely necessary.
C	there is ice and snow, to prevent skidding.
D	you will be parked for a short time.

Question 48

A pre-trip inspection should be completed:

A	whenever you stop to refuel.
B	before operating the vehicle.
C	if any problems occurred the last the time the vehicle was operated.
D	at least once a week.

Question 49

When loading cargo, what is an important rule to remember?

A	Load more cargo toward the front of the truck for a full load.
B	Load cargo toward the rear of the truck for easier unloading.
C	Load cargo weight evenly over all the axles.
D	Load more weight over the drive axle for better traction.

Question 50

Two main things to look for up ahead while driving are ______ and ______.

A	truck stops, gas stations
B	law enforcement officers, detours
C	tunnels, overpasses
D	vehicles, traffic signs

Once you are finished, click the button below. Any items you have not completed will be marked incorrect. Get Results

There are 50 questions to complete.

←

List

→

Return

Shaded items are complete.

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16	17	18	19	20
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Our free CDL practice tests have been created to work perfectly on high-end mobile devices, such as smart phones and tablets, as well as desktop computers so, feel free to take our CDL practice tests on your smart phone to refresh your memory while you are waiting in line at the DMV.

Below you will see links to state-specific CDL Cheat Sheets and CDL Help Guides that will guide you through the process of obtaining your Commercial Learner’s Permit and Commercial Driver’s License.

Here at Truck Driving Schools Info we give you the tools you need to “Know Before You Go!”.

Check out the CDL Exam Answer Sheets and CDL Help Guides available for all 50 states.

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