Missouri
CDL Practice Test

Use this free site to practice for the Wyoming CDL test. You can take these practice test questions as many times as you like. Topics covered in the practice tests include gross weight, hazmat transportation, air brakes, and pre-trip inspection Class A rules. 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 Quiz" button below to begin. Good luck!

1 / 40

A battery box check is important. The battery must be secure, connection must be tight, and cell caps must be present. In addition these items should be checked:

Battery connections should not show signs of excessive corrosion, but the battery box and cover or door is unimportant.

Battery connections should not show signs of excessive corrosion, and the battery box and cover or door should not be damaged and should be secure.

The fluid level inside the battery.

Battery connection should show signs of excessive wear.

2 / 40

When should you drain air tanks that do not have an automatic tank drain?

at the end of each working day

every 4 hours of the working shift

once every 14 days

once every 7 days

3 / 40

Why does it take special skills to haul a tank vehicle?

It is top heavy.

The weight of the load is high up off the road.

All of the answers listed.

There is a high center of gravity.

4 / 40

This carries hydraulic fluid or air to the wheel brake assemby.

Brake drums

Brake lines/hoses

Slack pieces

Connector rods

5 / 40

What should you do before you begin to couple?

position the fifth wheel beforehand

inspect the condition of the frame of the tractor

check your path for any hazards

activate the spring brakes

6 / 40

Which of the following is NOT a basic step to be taken at a crash scene?

gather the contact information of all the drivers involved

protect the area

care for the injured

notify authorities

7 / 40

Urban mass transit coaches may have a brake and accelerator interlock system. Which of the following statements is true?

All of these answers are correct.

The interlock releases when you close the rear door.

Do not use this safety feature in place of the parking brake.

The interlock applies the brakes and holds the throttle in idle position when the rear door is open.

8 / 40

The manual says you should look _____ ahead while driving.

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

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

9 / 40

You must first______to supply air to the trailer.

push in the tractor protection valve

pull out the tractor protection valve

turn off the engine so you can hear the brakes

cross the air lines to check for the presence of leaks

10 / 40

If the hazardous materials are classified as FORBIDDEN you should:

Refuse the load.

Remove the placards from the trailer.

Take special caution in transporting the material.

Place the materials in the front of the trailer.

11 / 40

Which of the following statements about "Radioactive" labels is true?

White i indicates the highest level of radioactivity.

Yellow ii indicates the highest level of radioactivity.

Yellow iii indicates the highest level of radioactivity.

Black iii indicates the highest level of radioactivity.

12 / 40

To maintain alertness during the trip, drivers should:

schedule trips during the daytime hours

get 8-9 hours of sleep

all of these answers are correct

avoid medications that cause drowsiness

13 / 40

You should follow behind other vehicles ______when traveling under 40 mph.

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

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

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

14 / 40

Suspension systems:

keep the steering wheel tight

keep the axles in place

keep the load secure

keep the brake drums from failing

15 / 40

How much space should you see between the lower and upper fifth wheel when checking the coupling of a converter dolly?

it depends on how heavy the load is

1 to 1 1/2 inches

1/2 to 1 inch

none

16 / 40

Why are you required to take an exam about air brakes?

you would have to get a CDL with a restriction otherwise

it is a federal requirement

you cannot receive a CDL at all otherwise

all trucks have air brakes

17 / 40

At the end of each shift you should:

Inspect your bus.

Report any damage.

All of these answers are correct.

Report any defects.

18 / 40

What color are all school buses painted?

Florescent yellow.

National school bus yellow.

The individual district decides the exact color.

Orange yellow.

19 / 40

"Outages" is the word to describe the amount of space required for liquids to expand in as they warm.

True

False, it's when the vehicle power system fails in some way

False, it's when the vehicle engine fails in some way

False, it's when the vehicle air braking system fails in some way

20 / 40

Select the item that is not checked in the engine compartment:

The oil pressure

The coolant level

The level of the oil

The power steering fluid

21 / 40

Some school busses are marked with the LNG placard. What does LNG stand for?

Liquified natural gas.

None of these answers are correct.

Low-range pneumatic gearbox.

Lifted neutral graftring.

22 / 40

Which of the following statements about stopping distances is NOT true?

trucks traveling on ice or snow require greater stopping distances

trucks traveling at higher speeds require greater stopping distances

empty trucks require greater stopping distances because they have less traction

brakes, tires, springs and shocks are designed to work best when the truck is empty

23 / 40

What is the most important reason for doing a vehicle inspection?

to save you money by preventing costly repairs

safety for yourself and other road users

to insure that you will achieve the best gas mileage

federal and state laws require you to inspect your vehicle

24 / 40

Select the true statement in regards to unhooking the pintle hook while the converter dolly is still under the trailer.

this is recommended as it is standard procedure

this is recommended because it keeps the trailer from tipping over

this is not recommended as it could could cause damage to the pintle hook

this is not recommended because it may result in injury

25 / 40

This object should not be worn dangerously thin where visible.

The brake chambers

The brake linings

The air system lines

All answers listed

26 / 40

What are spring brakes?

all of these answers are correct

they do not function when the psi falls below 30 psi

they are powerful springs that hold back air pressure when driving

they are brakes that automatically come on for a truck or trailer when the psi drops too low

27 / 40

A shipper’s certification is best described as _____.

a test for shippers that certifies that they are qualified to package hazardous materials

a paper certification given to the manufacturer from the shipper

a certification that the package has been prepared according to the rules when the shipper packages hazardous materials

a paper certification from the manufacturer given to the shipper

28 / 40

What is incorrect concerning disruptive passengers?

Don't discharge such riders where it would be unsafe for them.

You must remove the disruptive passenger immediately for the safety of the others.

You must ensure the disurptive rider's safety as well as that of others.

It may be safer to wait and discharge the disruptive passenger at the next scheduled stop or a well-lighted area where there are other people.

29 / 40

A placarded vehicle must have at least ___ placards?

six

four

two

three

30 / 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

31 / 40

Select the true statement in regards to an application pressure gauge:

it shows how much air pressure you are applying to the brakes

when accelerating it releases air

it prevents the brakes from failing

it is connected to the generator

32 / 40

Which of these statements about signaling is correct?

Signal your intentions early and continuously.

Signaling is a warning, not a request.

Leave your signal on long after you've changed lanes.

Signal to others that it is safe to pass your bus.

33 / 40

If you do become sleepy while driving, you should _____.

turn up the radio

stop to sleep

drink caffeinated beverages

roll down the windows

34 / 40

The front trailer supports should be____before driving away.

raised fully and the crank handle secured in its bracket

3 turns down from the top and the crank handle secured in its bracket

raised 1/3 of the way with the crank handle secured in its bracket

raised 1/2 way with the crank handle secured in its bracket

35 / 40

You are checking the_______when looking at the dipstick to see if the lubrication is at the safe operating range or above the refill line.

washer fluid level

battery fluid level

coolant level

oil level

36 / 40

When driving normally, some drivers use the hand valve before applying the brake pedal to prevent jack knifing. Select the most appropriate response to this statement.

it is the best possible way to brake and maintain the truck in a straight path

should be used with caution and only if you are aware of the dangers

it should not be done

it will result in less skidding than when just using the brake pedal alone

37 / 40

What is the purpose of cladding in a tanker?

It protects the tanker form any corrosive cargo.

It controls the temperature of the cargo.

It protects the cargo from changes in temperature.

It eliminates liquid surge.

38 / 40

An emergency escape ramp should be used _____.

only when not carrying a load

only in ideal conditions

any time the truck experiences a significant loss of braking power

only when it is raining

39 / 40

Select the accurate statement in regards to rolling up the landing gear to complete the coupling process.

you should grease the landing gear the increase the speed of the process

you should use a high gear to make the process faster

you should use a low gear until the tractor is supporting the trailer

you should leave the landing gear at the half way mark to make the uncoupling process easier later

40 / 40

Select the true statement about stop valves in a cargo tank:

They are manually operated.

They will fall off in an emergency.

They protect the piping and tank during rear end collisions.

They will close in an emergency.

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CDL Category Practice Tests

CDL Practice Test

How To Get A Missouri Commercial Drivers License

All applicants must be of the legal age of 18 years old or older to apply for their intrastate CDL privileges. In order to participate in interstate driving and obtain a HazMat Endorsement, the applicant must be 21 years old or older.

All applicants must have a certified medical examiner’s certificate to be eligible for a CDL.

Any applicants that fall into any of the below descriptions are disqualified from obtaining their Missouri CDL.

Any driver who has restricted CDL driving privileges in another state.
Any driver who has a valid driver’s license from another state.
Any driver who’s license is currently suspended, revoked, or canceled.

All Missouri residents are required to complete both knowledge tests and skills tests in order to receive their CDL.

Endorsements

T – Double or Triple Trailers
P – Passenger
N – Tank Vehicles
H – Hazardous Materials
X – Combination of HazMat and Tank Vehicle

Hit the Open Road

Missouri CDL License Test Tips

All applicants must pass a knowledge test to receive their CDL. Class B and C applicants must pass a 50 question exam. Class A applicants must pass a 70 question exam which includes questions about combinations. All endorsements require an additional knowledge assessment specific to the endorsement sought. Applicants must pass all required knowledge tests with a score of 80 percent or more.

In addition to the knowledge test(s), applicants will be required to pass a three-part practice skills test. This is a hands-on assessment of the applicant’s skills in pre-trip inspection, basic vehicle control, and on-road driving. All three parts of the assessment must be passed in order for the applicant to receive their CDL.

Additional Information

Information on the Missouri Department of Revenue

The Missouri Department of Revenue regulates the CDL license requirements in Missouri. To get more information contact them via:

Website: https://dor.mo.gov/drivers/commercial/cmv.php

Phone: 573.526.3669

Additional Missouri CDL Helpful Links

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

Missouri CDL Practice Test