delaware
CDL Practice Test

This site is available to practice and prepare to take the Delaware CDL test. These tests are free and you are able to take them as many times as you would like. You will be presented with 40 questions and you must answer 34 questions correctly to pass. There is a 50-minute time limit. You may not go back once you answer a question. Click the "Start Test" button below to begin.

1 / 40

You should keep a minimum of ____between another vehicle and the double trailer with 100 ft truck driving at 30 mph.

10 seconds

8 seconds

15 seconds

13 seconds

2 / 40

Drivers who transport route controlled radioactive materials must carry a dated certificate of radioactive materials training. This training must have ocurred within the last:

1 years

2 years

4 years

3 years

3 / 40

Select the true statement about empty trucks:

All answers listed.

They come to a stop faster when you use only the emergency brake.

They can take longer to stop than a truck with a full tank.

They have better traction on wet roads than full tanks.

4 / 40

The container for the mechanism that transforms the steering column action into wheel action is:

Locking pin

Air brake system

Steering hoses/box

Steering linkage

5 / 40

You should check that the _____are secure, caps are on tight, and is not leaking.

coolant system

fuel tanks

none of the answers listed

cb radio

6 / 40

Select the two reasons as to why special care is needed when driving a tank vehicle:

The chance of rollover and of spontaneous combustion.

None of the answers listed.

The danger of surge and the low center of gravity.

The danger of surge and the high center of gravity.

7 / 40

You should line up_____when getting ready to back under the trailer.

above 12 degrees to the right of the trailer

for the kingpin to activate on the driver's side first

directly in front of the trailer

about 12 degrees to the left of the trailer

8 / 40

How far before a railroad crossing should you stop your bus?

10 to 35 feet

50 to 75 feet

100 feet exactly

15 to 50 feet

9 / 40

Overhead inside mirror is used to:

see all of the students

see the blind spot immediately behind the bus

see the area where students exit the bus

monitor traffic that approaches and enters the blind spot area

10 / 40

What will probably happen if the converter dolly is still under the second trailer and the pintle hook is unhooked?

the engine brakes will unlock

the air lines will explode

nothing will happen

the dolly tow bar could fly up

11 / 40

What should you do if the low air pressure warning comes on for only one system in a truck or bus that has a dual air brake system?

decrease your speed and test the other system

continue on with your trip

decrease your speed and head to the closest mechanic

stop and safely park your vehicle only continue once the issue has been resolved

12 / 40

Select the true statement about convex ("spot") mirrors.

you do not need to look at them as often as flat mirrors

they make things look farther away and smaller than they actually are

they make things closer and larger than they really are

they are against the law in the majority of states

13 / 40

Why should you not use the trailer hand brake to straighten out a jack knifing trailer?

none of the answers listed

this is the only situation in which you should use the hand brake

the trailer wheels caused the skid in the first place once the trailer wheels grip the road again, the trailer will start to follow the tractor and straighten out

the tractor wheels caused the skid in the first place once the trailer wheels grip the road again, the trailer will start to push the tractor and straighten out

14 / 40

The Emergency Response Guidebook (ERG):

Is studied by emergency personnel to help keep the public safe.

Contains an index of hazardous material id numbers, which is why you must label things correctly.

All of these answers are correct.

Was created by the national department of transportation, so it is used nationwide.

15 / 40

Water is drained from the compressed air tanks because:

to keep the oil in the air compressor clean

the water could freeze in cold weather and cause braking failure

braking power is decreased due to the low boiling point of water

the water will over cool the compressor

16 / 40

Make sure that_____before you back under a trailer.

the air supply knob has been pulled out

the trailer brakes have been locked

the air brakes are in an off position

the air supply knob has been pushed it

17 / 40

Surge affects the handling of a tanker by:

None of the answers listed.

Increasing the wind drag.

Moving the truck in the direction the liquid flows in.

Allowing you to take tighter turns.

18 / 40

This object should not move more than an inch by pulled by hand with the brakes released for manual slack adjusters.

The brake chambers

The bounce absorbers

The brake pushrod

The air lines

19 / 40

Bus drivers must have a commercial driver license if they drive a vehicle designed to seat more than:

20 or more persons, excluding the driver.

10 or more persons, including the driver.

16 or more persons, including the driver.

15 or more persons, including the driver.

20 / 40

Which of these statements about speed management and braking is true?

Stopping time increases by one second for each 10 mph over 20 mph.

The total stopping distance of a bus is the distance it takes to stop once the brakes are applied.

The posted speed limit will always allow you to stop safely.

You need about four times as much stopping distance at 40 mph as at 20 mph.

21 / 40

To find out if a shipment includes a hazardous material, you should:

Check for a fence around the loading dock.

Look at the shipping papers.

Ask the driver.

Open and inspect every package and container.

22 / 40

Air tanks need to be drained:

air tanks should absolutely never be drained

to prevent water and oil from building up in the tank

to keep the tanks warm when not in use

to keep the tanks cold when not in use

23 / 40

When approaching railroad tracks, stop your bus:

15 and 50 feet before railroad crossings.

Only if you have manual transmission, then proceed with flashers on.

5-10 feet before railroad tracks.

On the tracks so you can see if the train is coming.

24 / 40

Which of the following is a recommended procedure when unloading the students?

Position yourself outside of the bus in front of crossover mirror to supervise unloading.

Let the students begin moving to the front of the bus before it's fully stopped to maximize efficiency.

Tell students to remain seated until they are told to exit.

Put the transmission in neutral gear and put on the brakes.

25 / 40

A tank trailer should never be fully loaded due to:

The liquid can expand causing a leak from the trailer.

The movement is stronger.

The will be more shifting of the load.

The baffles aren't as effective.

26 / 40

Take extra caution when driving smooth bore tanks during:

Driving into the wind.

All answers listed.

Stops and starts.

Drive down or up an incline.

27 / 40

While driving on a clear night with low beam headlights, you should be able to stop within:

Half of a football field.

2 lengths of your vehicle.

The distance you can see ahead of you.

The distance you will travel in the next 20 seconds.

28 / 40

To avoid rollover when going through a curve, the best thing to do is:

Drive at a speed below the posted speed limit.

Drive at a speed higher than the posted speed limit.

Ride the brakes through the curve.

Pump the brakes through the curve.

29 / 40

Select the true statement in regards to your brake function when your ABS fails

you will have no control over your truck as the brakes will not be functioning

you will need to pull over immediately

the abs will need to be repaired but the brakes will function normally

there is a huge fire risk

30 / 40

What must vehicles with air brakes have?

an air pressure gauge that shows how much air is used by the brake chambers for braking

an air pressure gauge that shows the pressure available for braking

a minimum of 2 air tanks

all of these answers are correct

31 / 40

When using turn signals, which of the following should be avoided?

signal just before you start to make a turn

signal before you exit

signal when you want to change lanes

signal when you are merging into traffic

32 / 40

When driving with multiple trailers, which one should be right behind the tractor?

the trailer with the heaviest load

the trailers shortest in length

the trailer with the smallest road

the trailer longest in length

33 / 40

For what reason do you keep the starter switch key in your pocket during the pre-trip inspection?

so you don't lose it

you will need it to open the side box

you will need it to inspect the trailer

so no one moves the vehicle while you are inspecting underneath it

34 / 40

You should___when driving down a long steep hill.

use the engine brakes only

repeatedly pump the brake pedal

begin braking once the vehicle is 10 mph above safe speed

release the brake once the vehicle is traveling 5 mph below the safe speed

35 / 40

Select the true statement in regards to what the fifth wheel should be checked for.

if there is any missing or damaged parts

if it is properly greased

all answers listed

if the jaws are open

36 / 40

Shifting into a lower gear and removing your foot off of the accelerator to slow your vehicle is known as?

engine braking

brake fade

anti-lock braking

double clutching

37 / 40

What is the value of the overhead rear-view mirror inside of the bus?

To provide visibility directly in the back of the bus.

To check blind spots.

To monitor passenger activity.

To monitor the driver's appearance.

38 / 40

Which of the following is a reason to evacuate the school bus?

A child set off a stink bomb inside the bus.

The bus abs warning light is on.

The bus is stalled on a shoulder of a 4-lane divided highway and it is getting hot inside.

The bus is stalled on a rail road track, but there is no train in sight.

39 / 40

You should back up slowly until____when coupling the trailer.

the cargo inside the trailer shifts

the fifth wheel has just touched the trailer

the tractor comes in contact with the front of the trailer

the rear wheels are visible in the mirror

40 / 40

Which contains more alcohol: a 12-ounce glass of 5% beer, a 5-ounce glass of 12% wine or a 1 1/2-ounce shot of 80 proof liquor?

they all contain the same amount of alcohol

12-ounce glass of 5% beer

1 1/2-ounce shot of 80 proof liquor

5-ounce glass of 12% wine

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CDL Practice Test

How To Get A delaware Commercial Drivers License

Those who are 18 years of age and older can apply for their CDL. To receive privileges for out-of-state driving, doubles/triples, hazmat, and transporting vehicles, residents must be at least the legal age of 21 years old. All CDL applicants are required to comply with the MCSR 49 CFR 391.41 section of the Federal Codes regarding commercial driving medical requirements. Individuals must present a medical examiner’s certificate at the time of their CDL application.

Any of the following will automatically disqualify an applicant from receiving their CDL:

Having a revoked, suspended, canceled, or denied driver’s license.
Being convicted in the past 24 months of driving impaired in a commercial vehicle.
Having disqualified CDL privileges in another state.
Possessing more than one operator’s license.

All applicants are required to complete an on-site vision test, knowledge test(s), and a practical skills test. All tests must be successfully passed before a Delaware resident can be issued their CDL.

Endorsements
S – School Bus
X – Tank and Hazmat
T – Doubles and Triples
P – Passenger
N – Tank Vehicles
H – Hazardous Materials

Hit the Open Road

delaware CDL License Test Tips

Delaware residents must complete, at the minimum, one knowledge test to be considered eligible for a CDL. Depending on the Class and the Endorsements that are sought, individuals may have to undergo additional testing. All tests must be passed with a score of 80 percent or more. General knowledge tests for Class B and C drivers are 50 questions. Those seeking their Class A will have 50 general knowledge questions with an additional 20 questions about combination driving. Endorsements and the Air Brake Restriction Removal require additional knowledge tests that are between 20 and 30 questions each.Once an individual passes their knowledge test they are given a commercial learning permit (CLP). After waiting 14 days, the holder can take their skills test. This is a three part test that assesses the individual’s ability to operate a commercial motor vehicle. The test includes a pre-trip inspection, a driving test, and a basic controls test. All three parts must be successfully passed for the applicant to be eligible for their CDL. If applying for a special endorsement, the individual must take their test in the vehicle the endorsement is for.

Additional Information

Information on the Delaware Division of Motor Vehicles

The State of Delaware Division of Motor Vehicles provides oversight and administration for the CDL requirements and testing in Delaware. To get more information contact them via:

Website: https://www.dmv.de.gov/DriverServices/drivers_license/CDL/index.shtml

Phone: 302.326.5000

Additional Delaware CDL Helpful Links

Please use the links below to access more valuable Delaware CDL testing resources and to learn more about practice driving tests for the state of Delaware.

delaware CDL Practice Test