South Dakota General Knowledge Practice Test

This is our South Dakota 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

______ can cause a fire.

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

Question 2

The braking power of the spring brakes:

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

Question 3

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 have a plan to communicate the risk.
C	it is a federal law.
D	you want to avoid doing something all of a sudden.

Question 4

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

Question 5

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

A	four times
B	three times
C	two times
D	half

Question 6

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	The same amount of stopping distance.
C	Greater stopping distance.
D	Shorter stopping distance.

Question 7

Empty trucks ______.

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

Question 8

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

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

Question 9

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 10

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 being hauled at high speed.
D	the trailer is out of brake adjustment.

Question 11

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

Question 12

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

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

Question 13

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

Question 14

With regard to safe driving, what does communicating mean?

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

Question 15

Wheel bearing seals should be checked for ______.

A	leaks
B	burning
C	rubbing
D	rust

Question 16

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	use only water in the cooling system.
C	check the coolant level of a hot engine.
D	use windshield washer fluid as coolant.

Question 17

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

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

Question 18

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

Question 19

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

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

Question 20

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

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

Question 21

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

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

Question 22

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

Question 23

Rust around a lug nut is a sign that:

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

Question 24

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

Question 25

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

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

Question 26

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	turn wide before you start the turn
D	start the turn, then back up to re-position

Question 27

Containerized loads are:

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

Question 28

If you become sleepy while driving, you should:

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

Question 29

The reason placards are used is:

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

Question 30

Which of the following is considered a hazard?

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

Question 31

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	Oil on the tie rod.
C	Too many vertical stacks.
D	Play in the steering wheel of more than five degrees.

Question 32

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

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

Question 33

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 34

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	make sure you are driving slow enough so you can stop within the range of your headlights in case of an emergency.
D	drink coffee or other caffeine products to help keep you awake.

Question 35

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

Question 36

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

Question 37

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

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

Question 38

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 39

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

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

Question 40

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	because it is a requirement for all drivers.
D	to help ensure the vehicle will make it to your destination.

Question 41

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 42

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	downshift into the turn.
C	check to make sure that the brakes are properly balanced.
D	keep two hands firmly planted on the steering wheel at all times.

Question 43

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

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

Question 44

Any flatbed load must have at least ______ tie downs.

A	one
B	three
C	two
D	four

Question 45

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

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

Question 46

Serious vehicle skids are usually caused by:

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

Question 47

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 48

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 49

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	Push the brake pedal firmly 5 seconds; listen for leaks.
D	Move forward slowly and push firmly on the brake pedal.

Question 50

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

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

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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

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 2

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	Put your warning devices out within 15 minutes.
C	Turn on your 4-way emergency flashers to warn other drivers.
D	Keep your low beam lights on.

Question 3

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	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 even with the top of the fifth wheel.

Question 4

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

Question 6

Serious vehicle skids are usually caused by:

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

Question 7

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

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

Question 8

Which of the following is considered a hazard?

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

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

Question 10

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 11

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

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

Question 12

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

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

Question 13

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

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

Question 14

The braking power of the spring brakes:

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

Question 15

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 16

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

Question 17

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

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

Question 18

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

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

Question 19

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

Question 20

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

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

Question 21

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 22

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

Question 23

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 24

If you become sleepy while driving, you should:

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

Question 25

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 26

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

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

Question 27

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

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

Question 28

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

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

Question 29

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 30

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

A	four times
B	two times
C	three times
D	half

Question 31

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 32

You know your brakes are fading when:

A	there is a slight vibration when you press down on the brake pedal.
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	the brake pedal feels firm when you apply pressure.

Question 33

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

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

Question 34

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	Nothing, because the posted speed limit for the offramp is usually 10 miles per hour below the safe speed limit for the offramp.
C	Downshift after you are in the curve.
D	Slow to a safe speed before the curve.

Question 35

Any flatbed load must have at least ______ tie downs.

A	one
B	three
C	two
D	four

Question 36

______ can cause a fire.

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

Question 37

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 38

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

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

Question 39

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

A	Load more weight over the drive axle for better traction.
B	Load cargo weight evenly over all the axles.
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 40

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	Shorter stopping distance.
D	The same amount of stopping distance.

Question 41

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	One vehicle length for every 10,000 lb. of gross vehicle weight.
C	The same amount of space you would at night.
D	The same amount of space you would on a dry road.

Question 42

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 43

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 44

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

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

Question 45

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 46

Wheel bearing seals should be checked for ______.

A	burning
B	leaks
C	rubbing
D	rust

Question 47

Rust around a lug nut is a sign that:

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

Question 48

Empty trucks ______.

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

Question 49

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	to ensure safety for yourself, your passengers, and other drivers.
D	because law enforcement may inspect your vehicle on the road.

Question 50

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	testing the trailer brakes after hooking up to a trailer.
C	it is absolutely necessary.
D	you will be parked for a short time.

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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