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

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

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

Question 2

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

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

Question 3

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

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

Question 4

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 more weight over the drive axle for better traction.
C	Load cargo toward the rear of the truck for easier unloading.
D	Load cargo weight evenly over all the axles.

Question 5

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

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

Question 6

With regard to safe driving, what does communicating mean?

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

Question 7

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 tunnel.
D	before starting down a hill and before entering a curve.

Question 8

If you become sleepy while driving, you should:

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

Question 9

Rust around a lug nut is a sign that:

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

Question 10

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

A	the kingpin is about 1¼ inches above the fifth wheel.
B	it will be raised slightly when the tractor is backed under it.
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 11

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

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

Question 12

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

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

Question 13

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

Question 14

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

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

Question 15

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

A	half
B	three times
C	two times
D	four times

Question 16

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

Question 17

Empty trucks ______.

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

Question 18

Containerized loads are:

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

Question 19

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

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

Question 20

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

Question 21

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

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

Question 22

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

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

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

Question 24

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	All of these things happen.
D	Muscle control and coordination are affected.

Question 25

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	Slow to a safe speed before the curve.
C	Turn on your four-way flashers as you approach the offramp.
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 26

______ can cause a fire.

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

Question 27

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

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

Question 28

Wheel bearing seals should be checked for ______.

A	rubbing
B	leaks
C	burning
D	rust

Question 29

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	there is a slight vibration when you press down on the brake pedal.
C	the brake pedal feels firm when you apply pressure.
D	you release pressure on the brake pedal and speed increases.

Question 30

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

Question 31

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

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

Question 32

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

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

Question 33

Any flatbed load must have at least ______ tie downs.

A	three
B	four
C	one
D	two

Question 34

When you are driving at night, you should:

A	make sure you are driving slow enough so you can stop within the range of your headlights in case of an emergency.
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	keep your high beams on at all times.

Question 35

A pre-trip inspection should be completed:

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

Question 36

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

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

Question 37

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

A	downshift into the turn.
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	keep the cargo as close to the ground as possible.

Question 38

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

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

Question 39

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

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

Question 40

Serious vehicle skids are usually caused by:

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

Question 41

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 42

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

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

Question 43

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 44

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 lower gear than you would use to climb the hill.
D	Use a higher gear than you would use to climb the hill.

Question 45

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

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

Question 46

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

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

Question 47

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

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

Question 48

The braking power of the spring brakes:

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

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

The reason placards are used is:

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

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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

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	there is ice and snow, to prevent skidding.
C	you will be parked for a short time.
D	it is absolutely necessary.

Question 2

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

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

Question 3

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	4/32-inch in every major groove.
D	2/32-inch in every major groove.

Question 4

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

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

Question 5

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

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

Question 6

When you are driving at night, you should:

A	roll down your window so that the fresh air will help keep you awake.
B	keep your high beams on at all times.
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 7

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

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

Question 8

______ can cause a fire.

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

Question 9

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

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

Question 10

The two driving conditions in which you should downshift are:

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

Question 11

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

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

Question 12

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

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

Question 13

A pre-trip inspection should be completed:

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

Question 14

Empty trucks ______.

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

Question 15

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

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

Question 16

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

Question 17

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	keep the cargo as close to the ground as possible.
C	downshift into the turn.
D	keep two hands firmly planted on the steering wheel at all times.

Question 18

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 19

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

Question 20

The braking power of the spring brakes:

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

Question 21

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

A	three times
B	four times
C	half
D	two times

Question 22

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

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

Question 23

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

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

Question 24

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	Oil on the tie rod.
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 25

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 26

Serious vehicle skids are usually caused by:

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

Question 27

With regard to safe driving, what does communicating mean?

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

Question 28

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 29

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

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

Question 30

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 31

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 empty or lightly loaded.
D	the trailer is out of brake adjustment.

Question 32

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 the freeway.
D	you are driving on hilly, rural roads.

Question 33

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	Pump the brake pedal 5 times; push the pedal firmly 3 seconds; the pedal should not move.
D	Move forward slowly and push firmly on the brake pedal.

Question 34

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

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

Question 35

Which of the following is considered a hazard?

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

Question 36

You know your brakes are fading when:

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

Question 37

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

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

Question 38

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 39

Containerized loads are:

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

Question 40

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	More space than is needed for ideal driving conditions.
C	The same amount of space you would at night.
D	The same amount of space you would on a dry road.

Question 41

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

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

Question 42

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

Question 43

The reason placards are used is:

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

Question 44

Wheel bearing seals should be checked for ______.

A	rust
B	rubbing
C	burning
D	leaks

Question 45

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

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

Question 46

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	because law enforcement may inspect your vehicle on the road.
C	to help ensure the vehicle will make it to your destination.
D	because it is a requirement for all drivers.

Question 47

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

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

Question 48

Any flatbed load must have at least ______ tie downs.

A	one
B	two
C	three
D	four

Question 49

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

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

Question 50

If you become sleepy while driving, you should:

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

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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