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

In what position should the converter dolly air tank drain valves and pintle hook be in?

open and latched

open and open

closed and latched

closed and open

2 / 40

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

none

1 to 1 1/2 inches

1/2 to 1 inch

it depends on how heavy the load is

3 / 40

What color are all school buses painted?

Florescent yellow.

Orange yellow.

The individual district decides the exact color.

National school bus yellow.

4 / 40

What will happen should a driver cross the air lines when hooking up the an older trailer?

the hand valve will activate the tractor brakes instead of the trailer brakes

none of the answers listed

the brake pedal will activate the trailer spring brakes instead of the air brakes

if there are no spring brakes, you can drive on but there will be no trailer brakes

5 / 40

Who is responsible for packaging, labeling, and preparing the hazardous material shipping papers for a common carrier?

The shipper

The carrier

The driver

Your spouse

6 / 40

What is always required before loading, driving, or unloading a tanker?

An inspection

Registration of driving plan

Clean the vehicle

Shift into park

7 / 40

The designation RQ identifies the material's:

Reportable quantity

Reference quotient

Regulatory quantity

Regulatory quotient

8 / 40

Select the true statement in regards to large combination vehicles taking longer to stop.

they take the same amount of time to stop when empty or loaded

they take longer to stop than bobtail tractors

they take longer to stop when loaded down

they take longer to stop when they are empty

9 / 40

Select the true statement in regards to brake drums:

They are bolted to the wheels.

They are located at both ends of the axles of the vehicle.

All of these answers are correct.

Hold the brake linings and shoes.

10 / 40

The sliding mechanism and locking device for a tandem axle on trailers is:

Locking pins/tandem release arm

Metal frame

Apron

Suspension system

11 / 40

On a drawbridge, you do not need to stop, but must slow down and make sure it's safe, when:

There is a traffic light showing green.

The bridge has an attendant or traffic officer who controls traffic whenever the bridge opens.

None of these answers are correct.

Both of these answers are correct.

12 / 40

How do you hook a combination to a second trailer without spring brakes and without using wheel chocks?

make sure the trailer won't roll when coupling

disconnect the air supply lines after supplying air to the trailer air system via the tractor

go ahead and couple it

have the trailer electric cord to a generator so it can supply braking power

13 / 40

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

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

empty trucks require greater stopping distances because they have less traction

trucks traveling on ice or snow require greater stopping distances

trucks traveling at higher speeds require greater stopping distances

14 / 40

The most important hand signal you should agree on with a helper is:

“go”

“faster”

“stop”

“turn up the music”

15 / 40

Which signals may be used to warn of a stopped vehicle that contains explosives?

All of these answers are correct

Flares or fuses

Reflective triangles

Signal fires

16 / 40

If a rider wants to bring a car battery or a can of gasoline or kerosene aboard your bus, you should:

Not allow the rider to do it.

Have the rider pay a second fare.

Put the materials in the bus's "safe box".

Instruct the rider to sit next to an open window.

17 / 40

When does your vehicle's single brake system need an adjustment?

when the pressure builds from 85 to 100 psi in less than 1 minute

if the compressor cuts out at between 70 and 90 psi

when the governor stops between 75-90 psi

if the pressure builds from 50 to 75 psi in less than 3 minutes

18 / 40

Select the statement that best explains the "crack-the-whip" effect.

it is when you make a sudden movement of the steering wheel or a quick lane change and the rear trailer tends to swing out. The force of the rear trailer becomes amplified, which will cause it to roll over (rearward amplification).

it is when the trailer is half full with the cargo loaded in the rear half of the trailer. When you make a sudden movement of your steering wheel the cargo will forcefully slide towards the back of the trailer which will force the trailer to roll over.

it is when you make a sudden movement of the steering wheel or a quick lane change and the tractor tends to rock and sway. The velocity of the rearmost trailer forces the tractor to roll over before the trailer.

it is when the trailer is half full with the cargo loaded in the front half of the trailer. When you make a sudden movement of your steering wheel the cargo will forcefully slide towards the back of the trailer which will force the trailer to roll over.

19 / 40

There are 2 reasons as to why hauling liquids take special care. One reason is the ___center of gravity.

long

high

low

narrow

20 / 40

This object is required to be checked for damage, that it's secure, and strong enough to handle any cargo.

The apron

The fifth wheel

The platform

The header board

21 / 40

How much space should there be between the lower and upper fifth wheel?

zero

it is dependent on the load you are carrying

1/4 to 1/2 of an inch

1 to 2 inches

22 / 40

When inspecting your bus, you must make sure that:

Rider signaling devices are working.

Emergency exit handles are secure.

Every handhold and railing is secure.

All of these answers are correct.

23 / 40

Select the statement that is not part of the air-brake system:

emergency brake system

clutch brake system

parking brake system

service brake system

24 / 40

Front wheel brakes are good under what kind of conditions?

ideal weather conditions

they are not ideal

icy or wet conditions

any weather conditons

25 / 40

Select the true statement in regards to stopping distance and speed:

All answers listed.

A wet road will double the stopping distance at any speed.

You require 4 times as much stopping distance when driving at 40 mph compared to 20 mph.

Larger / heavier vehicles generally take longer to stop.

26 / 40

Which of the following parts do not get checked in the Bus Interior inspection:

Seat coverings.

Each hand-hold and railing.

Emergency exit handles.

Signaling devices, including the restroom emergency buzzer, if the bus has a restroom.

27 / 40

To decide which placards you need, if any, what three things do you need to know?

Materials hazard class, amount being shipped, and amount of all hazardous materials of all classes on your vehicle.

Materials hazard class, location being shipped, and amount of all hazardous materials on your vehicle.

Materials hazard class, percentage of total volume, and amount of all hazardous materials on your vehicle.

Packing group numbers, amount being shipped, and amount of all hazardous materials of all classes on your vehicle.

28 / 40

What is most likely to occur when driving a set of doubles and a set of trailer wheels goes into a skid?

no matter how you turn the steering wheel, the rig will continue in a straight line

there will be a trailer jackknife

nothing will occur

the rig will slide sideways but stay in a straight line

29 / 40

Who is responsible for certifying on the bills of lading that the hazardous materials are prepared properly?

The driver

The shipper

The carrier

The dock workers

30 / 40

The pintle hook should be_____ and the converter dolly air tank drain valve is___when doing a walk around inspection of a triple or double trailer.

free, open

free, closed

latched, open

latched, closed

31 / 40

Bus drivers must have a CDL if they drive a vehicle:

That is designed to carry more than nine passengers.

Designed to seat more than 16 or more persons, including the driver.

That has air brakes.

That has a gross weight rating of more than 26,000 pounds.

32 / 40

While completing the 1st component of the air brake check you are required to fully push down on the foot brake and _____.

see if the air pressure drops more than 3 lbs in a minute while holding it down for that full minute in a single vehicle

none of the answers listed

see if the air pressure drops more than 4 lbs in a minute while holding it down for a full minute in a combination vehicle

both of the answers listed

33 / 40

Select the true statement in regards to driving a truck with triple or double trailers:

the risk of trailer jackknifes and tipping is increased compared to shorter trucks

extra care should be taken when driving in bad weather and in the mountains

the truck requires increased following distance compared to smaller vehicles

all answers listed

34 / 40

An "A/W" the first column of the hazardous materials table means:

This material has no restrictions when shipped by air and/or water.

This material is only restricted when shipped by air and/or water.

It is ok to ship this material by air only.

There is no restrictions with this material if shipped by water only.

35 / 40

With the engine cut off and the brakes released the air loss in a straight truck or bus should not be more than:

5 psi in a minute

4 psi in a minute

2 psi in a minute

3 psi in a minute

36 / 40

How often should you check the tires on a placarded trailer that has dual tires?

Once every 100 miles.

Once every three hours.

Each time you stop.

Start of each day and every time you stop.

37 / 40

Which hazard classes must you NEVER smoke, or perform any activity involving fire, within 25 feet of?

Class 1 only

Class 2 only

Classes 1, 2, 3, and 4

Class 4 only

38 / 40

When accelerating:

always use the parking brake to slow down

"hammer down" when your wheels start to spin

speed up smoothly and gradually and avoid jerking

do not engage the clutch before you take your foot off the brake

39 / 40

A safe haven is ______.

an approved place for parking attended vehicles loaded with flammable materials

an approved place for parking unattended vehicles loaded with corrosive materials

an approved place for parking unattended vehicles loaded with explosive materials

an approved place for parking unattended vehicles loaded with radioactive materials

40 / 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 builds up the air pressure in the air tanks

it helps control your speed better

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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