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

What is a passive railway crossing?

The type of crossing on which the driver does not have to stop.

The type of crossing where you can pass the tracks without stopping.

The type of crossing, which does not have any type of traffic control device.

The type of crossing with no cross buck sign.

2 / 40

This should be cleaned and then adjusted properly while inside the cab.

The windshield

The mirrors

The lug bolts

The headlights

3 / 40

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

There is a high center of gravity.

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

All of the answers listed.

It is top heavy.

4 / 40

Select the true statement about what the Air Compressor Governor controls:

it controls when the brakes will be applied

it controls when the warning system is activated

it controls when air is released from the storage tank

it controls when the air compressor pumps air into the storage tanks

5 / 40

What is the normal operating range for a truck's oil pressure?

30-75 psi

This is engine-specific

40-60 psi

20-30 psi

6 / 40

What is the purpose of a driver placarding his or her vehicle?

Warning those with children to drive in another lane.

Giving people something interesting to look at while driving.

Forcing other drivers to stay 20 feet away in every direction.

Communicating risk.

7 / 40

If there is rust around the nuts, what may it indicate?

They are loose.

They are fitted just right.

They need to be changed out.

There is a leak somewhere.

8 / 40

A trailer is at the right height to have the tractor backed up to it when:

the top of the kingpin is even with the bottom of the fifth wheel

the kingpin is about 1 1/5 inches above the fifth wheel

it'll raise slightly when the tractor is backed up under it

the fifth wheel will not come in contact with the kingpin

9 / 40

How do you secure a second trailer to your combination vehicle?

none of the answers listed

use wheel chocks only

use the emergency air brakes or the trailer's spring brakes only

use emergency air brakes, spring brakes, and wheel chocks together

10 / 40

A tractor should not be backed under a trailer until the whole air system is:

at a level of 50 and 70 psi

at a level of 70 and 90 psi

at a normal pressure

at half of its normal pressure

11 / 40

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

4 psi in a minute

3 psi in a minute

5 psi in a minute

2 psi in a minute

12 / 40

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

it prevents the brakes from failing

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

it is connected to the generator

when accelerating it releases air

13 / 40

Air brake systems should not lose air faster than____when testing for air leakage rates in combination vehicles before applying the brake pedal.

6 psi a minute

5 psi a minute

3 psi a minute

2 psi a minute

14 / 40

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

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

All answers listed.

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

Larger / heavier vehicles generally take longer to stop.

15 / 40

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

It is ok to ship this material by air only.

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

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

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

16 / 40

Where should you place your warning devices if you must stop on a one-way or divided highway?

50 feet, 100 feet, and 150 feet toward approaching traffic

10 feet, 100 feet, and 200 feet toward approaching traffic

20 feet, 50 feet, and 100 feet toward approaching traffic

100 feet, 200 feet, and 300 feet toward approaching traffic

17 / 40

At what "cut out" level does the governor stop pumping air?

100 psi

75 psi

125 psi

150 psi

18 / 40

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

Back and turn toward the driver's side.

Back quickly while no one is coming.

Use your head as the mirrors are unreliable.

Back toward the side opposite the driver.

19 / 40

To test the tractor-trailer connection for security, you should:

drive forward with a sharp jerk

rock the trailer side to side with the trailer brakes on

drive forward in a low gear with the trailer brakes locked and then look at it carefully

drive forward in a high gear with the trailer brakes on and check it

20 / 40

Which of the following answers lists the three types of emergency equipment you must have on your bus?

Repair kit, spare electric fuses (unless equipped with circuit breakers), and fire extinguisher.

Emergency reflectors, fire extinguisher, signal flares and tire repair kit.

Fire extinguisher, spare electrical fuses (unless equipped with circuit breakers), and emergency reflectors.

Hydraulic jack, fire extinguisher, signal flares.

21 / 40

Select the true statement in regards to as why you should make sure the fifth wheel plate is greased as recommended:

To prevent any steering problems.

To make sure the electrical connections are good.

To decease heat and noise.

To make sure that uncoupling easier.

22 / 40

Another term for a smooth bore tank is:

A tank that is easily portable.

A liquid tank that does not have baffles.

A tank that is made out of stainless steel.

A liquid tank that has baffles.

23 / 40

Water is drained from the compressed air tanks because:

the water will over cool the compressor

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

to keep the oil in the air compressor clean

the water could freeze in cold weather and cause braking failure

24 / 40

____is the most common type of foundation brakes used by heavy vehicles.

S-Cam drum

Rectangle brakes

Wedge drum

None of the answers listed

25 / 40

The air leakage rate for a combination vehicle should not exceed ____psi a minute.

26 / 40

Which of the following is something the driver must watch for:

Appropriate clearance around and over the bus.

Gaps your bus needs to accelerate and merge with traffic.

Poles and tree limbs at stops.

All of these answers are correct.

27 / 40

Suspension systems:

keep the axles in place

keep the brake drums from failing

keep the load secure

keep the steering wheel tight

28 / 40

You should place the starter switch key into your pocket while you are performing the pre-trip inspection because:

all of these answers are correct

someone could start and move the truck

it could damage the starting mechanism

someone could steal the truck

29 / 40

Why do air brakes take longer to stop than hydraulic brakes?

longer reaction time

none of the answers listed

the lines are hotter

it takes more time for the air to flow through the lines

30 / 40

The most dangerous time during the school bus ride is:

When loading and unloading students.

Crossing railway crossing.

When the students become unruly on the bus.

On long bus journeys.

31 / 40

Two causes of tire fires are ______.

duals that touch and road debris

under-inflated tires and duals that touch

under-inflated tires and poor retreads

hot brakes and under-inflated tires

32 / 40

If there is not a sight glass to check the oil level you are required to look for leaks around the _____.

transmission

wheel rims

brake pads

axle seals/hub oil

33 / 40

Select the factor that is known to cause brakes to fail or fade. (more than one answer may be correct, but select only one)

tire retread that is mismatched

when using the engine brake more than the brakes

excessive heat from extensive use

brakes that are not aligned properly

34 / 40

This object should not be spliced, cut, chafed, or worn through to allow steel braid to show.

Tires

Electric/air lines

The lockjaw

Mud flaps

35 / 40

If you have riders on board, you must never refuel:

At any time.

In a closed building.

Unless on a scenic tour bus.

With any window open.

36 / 40

In the event of an accident you should remember to do the following EXCEPT:

notify authorities

move the victims out of the way immediately

stop any bleeding and keep the victims warm

protect the area

37 / 40

This item should be firmly attached the to frame, be solid, and clear of objects:

The locking jaw

The lock pins

None of these answers are correct answers are correct

The catwalk

38 / 40

When transporting hazardous waste, you must:

Carry a uniform hazardous waste manifest in the truck.

Sign a uniform hazardous waste manifest.

All of these answers are correct.

Have the word "waste" before the name of the material on the bills.

39 / 40

Select the reason as to why air tanks 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

tanks usually do not need to be drained

40 / 40

Which of the following statements about overhead space is true?

an empty van is lower than a loaded one

warning lights are always installed on low bridges and overpasses

the heights posted at bridges are usually accurate

the weight of the cargo changes a truck's height

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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