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 follow behind other vehicles ______when traveling under 40 mph.

as close as possible so other drivers won't cut in front of you

at a distance of 1 second for every 15 feet of your vehicle length

at a distance of 1 second for every 5 feet of your vehicle length

at a distance of 1 seconds for every 10 feet of your vehicle length

2 / 40

You should___when driving down a long steep hill.

repeatedly pump the brake pedal

use the engine brakes only

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

begin braking once the vehicle is 10 mph above safe speed

3 / 40

Which of the following is the proper definition of a cargo tank?

None of these answers are correct.

A bulk container permanently attached to a vehicle.

A bulk container which can be securely affixed to a vehicle.

A bulk container not permanently attached to a vehicle.

4 / 40

What is NOT one of the four skill areas that operating a commercial vehicle requires?

first aid certification

safely backing

accelerating

steering

5 / 40

What are spring brakes?

they are powerful springs that are restrained by air pressure when the air pressure is removed, the brakes are applied

they are large springs that are held closed by air pressure if the air pressure is increased the brakes are applied

they are big springs with air pressure in them if the air pressure decreases, the brakes are applied

none of the answers listed

6 / 40

When should air tanks be drained?

at every restroom break stop

they don't need to be drained

at the end of each working day

every 7 days

7 / 40

You need to be extra careful when driving smooth bore tanks:

All answers listed.

When hauling food or milk products.

When stopping or starting.

When unloading or loading.

8 / 40

It takes special care to drive tankers with liquid in them because:

The high center of gravity of the load.

The low center of gravity of the load.

The baffles create odd rocking motions.

The movement of the liquid even when the truck is stopped.

9 / 40

On tandem axle for trailers, the sliding mechanism and locking device is:

Tandem release (locking pin/arm)

Metal frame

Fifth wheel

Air brake system

10 / 40

The walls that separate compartments inside the tanks and having openings at the top and bottom are called:

Free walls

Layers

Baffles

Bulktears

11 / 40

If you are drowsy, you should _____ before you drive.

take a cold shower

drink coffee

do a little exercise

get sleep

12 / 40

Charter drivers should not:

Mention rules at the start of the trip.

Explain rules at the start of the trip.

Remind riders about rules once trip begins.

Allow riders on the bus until departure time.

13 / 40

What do you need to do to supply air to the air tanks of the second trailer?

open up the shutt off valves on the rear of the first trailer and close the shut off valve at the back of the second trailer

open the shut off valve at the back of both trailers

close the shut off valves at the back of each trailer

none of the answers listed

14 / 40

You should_____to uncouple the converter dolly.

lower the landing gear, disconnect the safety chain, and chock the wheels

chock the wheels, disconnect the safety chains, and then lower the landing gear

chock the wheels, lower the landing gear, and disconnect the safey chains

disconnect the safey chains, lower the landing gear, and chock the wheels

15 / 40

The emergency air line is _____and the service air line is____.

red, green

white, blue

red, blue

yellow, white

16 / 40

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

Drive at a speed below the posted speed limit.

Ride the brakes through the curve.

Pump the brakes through the curve.

Drive at a speed higher than the posted speed limit.

17 / 40

If you are transporting cargo, you should inspect the cargo and securing devices:

during every driving brake on the trip

before the trip, within 50 miles after beginning the trip, and at least every 150 miles or 3 hours

within the first 50 miles of driving

before the trip

18 / 40

What is the best way to figure out how many seconds of following distance you have?

get 1/4 closer to the car in front of you, then back off again multiply how long this took you by 4 for following distance

wait until a vehicle passes a shadow or landmark, then count the seconds until you pass it

text a friend and tell them to text you back in ten seconds and see how long that seemed to take compared to how far you traveled

use the stopwatch on your phone to try to determine how long before you reach a mile marker after the car in front of you appeared to reach it

19 / 40

The two main things to look ahead for while driving are _____.

bridges and tunnels

truck stops and police

fire and flooding

traffic and road conditions

20 / 40

This gauge has a governor cut-off.

Oil pressure gauge

Air gauge

The ammeter gauge

The coolant temperature gauge

21 / 40

The most dangerous time during the school bus ride is:

Crossing railway crossing.

When loading and unloading students.

When the students become unruly on the bus.

On long bus journeys.

22 / 40

Two causes of tire fires are ______.

under-inflated tires and poor retreads

duals that touch and road debris

under-inflated tires and duals that touch

hot brakes and under-inflated tires

23 / 40

What might happen if a trailer is too high when you try to couple?

all answers listed

it may not correctly couple

the trailer may tip to the side

the queen pin may fall off

24 / 40

Select the true statement in regards to converter dollies:

they typically require a hand converter

they typically have small braking power because of their size

they typically have a lot of stopping power because of their size

they typically do not have spring brakes

25 / 40

How should the hand valve be used?

only in emergency situations

when the trailer is fully loaded down

to test the trailer brakes

only in conjuction with the foot brake

26 / 40

What position should the heaviest trailer be in when pulling 3 trailers?

it makes no difference

in the middle

in the front

in the back

27 / 40

You should be in the proper gear before going down a hill because:

brakes may fail or fade from excessive heat due to relying on them too much and not using the engine brake effect

water may build up in the air tanks if you do not rely on the engine brake

it helps control your speed better

it builds up the air pressure in the air tanks

28 / 40

Which of the following would NOT be part of a standard vehicle inspection?

tire problems

steering system defects

bad brake drums or shoes

seating defects

29 / 40

Select when you should use the parking brake:

when in residential areas

when you are leaving your vehicle for more than an hour

with rare exception, every time you leave your vehicle

each time you leave your vehicle for any amount of time

30 / 40

Start by___when coupling.

backing the converter dolly under the second trailer

having the second trailer against the dock

coupling the converter hook to the pintle tongue of the first trailer

coupling the tractor to the second trailer

31 / 40

The manual says you should look _____ ahead while driving.

15 to 20 seconds, at highway speeds, about a half of a mile

12 to 15 seconds, at highway speeds, about a quarter of a mile

9 to 12 seconds, at highway speeds, about a quarter of a mile

5 to 8 seconds, at highway speeds, about an eighth of a mile

32 / 40

Select the definition for outage:

It is how much power is lost to the hydraulics.

It is loss of power to the headlights.

It is the process of liquid expansion as it becomes warm.

It is the liquid that must be drained off to meet legal carry limit.

33 / 40

Which of these is a good rule for backing a straight bus?

Back and turn toward the driver's side.

Use your head as the mirrors are unreliable.

Back quickly while no one is coming.

Back toward the side opposite the driver.

34 / 40

A truck with baffles will handle:

The same as a tanker with no baffles.

None of the answers listed.

With less front to back surge compared to trailers without baffles.

Heavier that it actually is.

35 / 40

You should expect____when backing a tractor under a trailer.

the trailer to lift slightly

the trailer to be completely still

the end of the kingpin to be level with the top of the fifth wheel

the trailer landing gear to be fully extended

36 / 40

You need to raise the landing gear just to the height of where it clears the pavement before driving.

true

false

only in ideal conditions

only in raining conditions

37 / 40

Select the reason as to why air tanks need to be drained:

tanks usually do not need to be drained

to provide greater control of your vehicle

to prevent the left sided brake from locking up

to release water and other contaminents which may cause brakes to fail in freezing weather

38 / 40

There must be a hazardous materials identification number on the ______ and on the ______.

package, trailer

shipping papers, package

trailer, packages

invoice, shipping papers

39 / 40

At around____the governor allows the air compressor to start pumping again:

125 psi

225 psi

100 psi

175 psi

40 / 40

You should___to reduce the air leakage rate.

release the service brake as the engine is running

release the service brake after turning off the engine

leave the engine running while charging the air system

monitor the air pressure gauge as you press on the brake pedal

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CDL Category Practice Tests

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