North Carolina General Knowledge Practice Test

This is our North Carolina General Knowledge Practice Quiz and Practice Test compiled of 50 questions each. Each question is worth two points for a total of 100 possible points. A passing score is 80%.

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

Start

Congratulations! You have completed the General Knowledge CDL Practice Quiz. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rated as %%RATING%% Pass your CDL Knowledge Exam the first time! Click here to get the Complete CDL Cheat Sheet Study Package for all 50 states!

Your answers are highlighted below.

Question 1

A pre-trip inspection should be completed:

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

Question 2

The reason placards are used is:

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

Question 3

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	five or more.
D	none of these.

Question 4

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 three.
D	A minimum of four.

Question 5

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

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

Question 6

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 the same gear you would use to climb the hill.
B	Shift the truck into neutral and coast down the hill to save gas.
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 7

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

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

Question 8

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	Put your warning devices out within 15 minutes.
D	Warn other drivers by using your left turn signal lights.

Question 9

You know your brakes are fading when:

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

Question 10

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

Question 11

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

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

Question 12

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

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

Question 13

If you become sleepy while driving, you should:

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

Question 14

Empty trucks ______.

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

Question 15

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

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

Question 16

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

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

Question 17

Any flatbed load must have at least ______ tie downs.

A	two
B	three
C	four
D	one

Question 18

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

A	check to make sure that the brakes are properly balanced.
B	downshift into the turn.
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 19

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 20

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

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

Question 21

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

Question 22

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

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

Question 23

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

Question 24

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 25

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

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

Question 26

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	Greater stopping distance.
C	Shorter stopping distance.
D	It depends on what mood you are in at the time.

Question 27

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

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

Question 28

The braking power of the spring brakes:

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

Question 29

Wheel bearing seals should be checked for ______.

A	rust
B	rubbing
C	leaks
D	burning

Question 30

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

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

Question 31

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

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

Question 32

______ can cause a fire.

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

Question 33

Rust around a lug nut is a sign that:

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

Question 34

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

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

Question 35

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

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

Question 36

Serious vehicle skids are usually caused by:

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

Question 37

When you are driving at night, you should:

A	roll down your window so that the fresh air will 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	drink coffee or other caffeine products to help keep you awake.

Question 38

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 wide as you complete the turn
D	turn right and drive over the curb

Question 39

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 ten degrees (two inches on a 20-inch steering wheel).
D	Play in the steering wheel of more than five degrees.

Question 40

With regard to safe driving, what does communicating mean?

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

Question 41

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

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

Question 42

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

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

Question 43

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

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

Question 44

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

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

Question 45

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

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

Question 46

Containerized loads are:

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

Question 47

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

A	four times
B	half
C	three times
D	two times

Question 48

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

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

Question 49

Which of the following is considered a hazard?

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

Question 50

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

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

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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

Start

Congratulations! You have completed the General Knowledge CDL Practice Test. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rated as %%RATING%% Pass your CDL Knowledge Exam the first time! Click here to get the Complete CDL Cheat Sheet Study Package for all 50 states!

Your answers are highlighted below.

Question 1

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

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

Question 2

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

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

Question 3

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

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

Question 4

Any flatbed load must have at least ______ tie downs.

A	two
B	one
C	three
D	four

Question 5

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 6

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

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

Question 7

Serious vehicle skids are usually caused by:

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

Question 8

Containerized loads are:

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

Question 9

A pre-trip inspection should be completed:

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

Question 10

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

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

Question 11

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

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

Question 12

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

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

Question 13

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

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

Question 14

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

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

Question 15

When you are driving at night, you should:

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

Question 16

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

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

Question 17

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 18

______ can cause a fire.

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

Question 19

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

Question 20

Which of the following is considered a hazard?

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

Question 21

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 22

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 as you complete the turn
C	turn wide before you start the turn
D	turn right and drive over the curb

Question 23

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

Question 24

If you become sleepy while driving, you should:

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

Question 25

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

A	Load cargo weight evenly over all the axles.
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 more cargo toward the front of the truck for a full load.

Question 26

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

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

Question 27

With regard to safe driving, what does communicating mean?

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

Question 28

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

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

Question 29

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

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

Question 30

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 31

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

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

Question 32

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	All of these things happen.
D	The drinker's brain is increasingly affected.

Question 33

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

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

Question 34

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

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

Question 35

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

A	two times
B	three times
C	half
D	four times

Question 36

Rust around a lug nut is a sign that:

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

Question 37

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

Question 38

The braking power of the spring brakes:

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

Question 39

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

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

Question 40

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

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

Question 41

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

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

Question 42

Empty trucks ______.

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

Question 43

Wheel bearing seals should be checked for ______.

A	rubbing
B	leaks
C	rust
D	burning

Question 44

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

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

Question 45

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 tank baffles are not always legal with outage.
D	Because some liquids expand more than others when they get warm.

Question 46

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

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

Question 47

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

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

Question 48

The reason placards are used is:

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

Question 49

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 50

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	Warn other drivers by using your left turn signal lights.
C	Keep your low beam lights on.
D	Put your warning devices out within 15 minutes.

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.

1	2	3	4	5
6	7	8	9	10
11	12	13	14	15
16	17	18	19	20
21	22	23	24	25
26	27	28	29	30
31	32	33	34	35
36	37	38	39	40
41	42	43	44	45
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"Dude, Go Back to Truck Driving School" because you FAILED!

"A Bad Truck Driver" because you FAILED!

"An Amateur Truck Driver" because you FAILED! "An Amateur Truck Driver!"

"A Good Truck Driver" because you PASSED!

"A Truck Driving Pro" because you PASSED!

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