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

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 2

Any flatbed load must have at least ______ tie downs.

A	one
B	two
C	three
D	four

Question 3

The reason placards are used is:

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

Question 4

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

Question 5

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 6

With regard to safe driving, what does communicating mean?

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

Question 7

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 8

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 9

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, reaction distance, and braking distance.
D	Perception distance, response distance, and reaction distance.

Question 10

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 11

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 12

Empty trucks ______.

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

Question 13

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	keep the cargo as close to the ground as possible.
D	check to make sure that the brakes are properly balanced.

Question 14

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

Question 15

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 16

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 17

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

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

Question 18

The braking power of the spring brakes:

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

Question 19

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

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

Question 20

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 21

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

A	two times
B	four times
C	half
D	three times

Question 22

Which of the following is considered a hazard?

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

Question 23

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

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

Question 24

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 25

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

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

Question 26

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

Question 27

______ 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 28

You know your brakes are fading when:

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

Question 29

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 empty or lightly loaded.
C	the trailer is being hauled at high speed.
D	the trailer is fully loaded or very heavy.

Question 30

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

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

Question 31

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 32

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 33

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 some liquids expand more than others when they get warm.
D	Because it's good to know that information.

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	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 35

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 36

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	Downshift after you are in the curve.
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	Turn on your four-way flashers as you approach the offramp.

Question 37

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 38

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 39

Serious vehicle skids are usually caused by:

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

Question 40

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.

Question 41

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

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

Question 42

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 43

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	before operating the vehicle.
D	at least once a week.

Question 44

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

Question 45

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

Question 46

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.

Question 47

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

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

Question 48

Wheel bearing seals should be checked for ______.

A	leaks
B	rubbing
C	burning
D	rust

Question 49

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

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

Question 50

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	Play in the steering wheel of more than five degrees.
D	Oil on the tie rod.

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"Dude, Go Back to Truck Driving School" because you FAILED!

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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

When you are driving at night, you should:

A	drink coffee or other caffeine products to help keep you awake.
B	keep your high beams on at all times.
C	roll down your window so that the fresh air will 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 2

Any flatbed load must have at least ______ tie downs.

A	four
B	two
C	three
D	one

Question 3

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	More space than is needed for ideal driving conditions.
D	The same amount of space you would at night.

Question 4

Containerized loads are:

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

Question 5

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 6

The reason placards are used is:

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

Question 7

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 8

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 fully loaded or very heavy.
C	the trailer is empty or lightly loaded.
D	the trailer is being hauled at high speed.

Question 9

Wheel bearing seals should be checked for ______.

A	rust
B	burning
C	leaks
D	rubbing

Question 10

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 11

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 12

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

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

Question 13

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	Slow to a safe speed before the curve.
D	Downshift after you are in the curve.

Question 14

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

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

Question 15

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

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

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	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 17

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 18

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.

Question 19

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

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

Question 20

Empty trucks ______.

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

Question 21

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

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

Question 22

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 lug nut is cheap.
D	the wheel needs cleaning.

Question 23

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

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

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	Play in the steering wheel of more than five degrees.
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	Oil on the tie rod.

Question 25

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 26

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 27

Serious vehicle skids are usually caused by:

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

Question 28

______ can cause a fire.

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

Question 29

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

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

Question 30

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 31

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

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

Question 32

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

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

Question 33

Which of the following is considered a hazard?

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

Question 34

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

Question 35

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

A	three times
B	half
C	two times
D	four times

Question 36

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 37

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

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

Question 38

You know your brakes are fading when:

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

Question 39

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 40

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 41

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 tank baffles are not always legal with outage.
C	Because some of the heaviest liquids don’t need any.
D	Because it's good to know that information.

Question 42

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 43

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

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

Question 44

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, response distance, and reaction distance.
D	Perception distance, reaction distance, and braking distance.

Question 45

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	5/32-inch in every major groove.
D	2/32-inch in every major groove.

Question 46

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

Question 47

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

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

Question 48

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

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

Question 49

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

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

Question 50

A pre-trip inspection should be completed:

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

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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