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

One reason hauling liquids in tank vehciles require special care is:

Because of strong winds.

Because of the movement of the liquid.

Because of the extreme weight.

Because of uneven expansion.

2 / 40

You should turn off your engine when loading flammable liquid unless:

The material does not need a placard.

You are a non-smoker.

You are loading at night and need the headlights.

You need the engine to run the pump.

3 / 40

You do not have to stop at railroad crossings, but must slow down and carefully check for other vehicles:

All of these answers are correct.

At crossings marked as "exempt" or "abandoned".

Where a policeman or flagman is directing traffic.

If a traffic signal is green.

4 / 40

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

bridges and tunnels

traffic and road conditions

truck stops and police

fire and flooding

5 / 40

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

you cannot receive a CDL at all otherwise

all trucks have air brakes

it is a federal requirement

you would have to get a CDL with a restriction otherwise

6 / 40

Do empty trucks have the best braking?

yes

yes, but only on wet surfaces

yes, but only if the truck is newer than 1998

7 / 40

To maintain alertness during the trip, drivers should:

all of these answers are correct

get 8-9 hours of sleep

avoid medications that cause drowsiness

schedule trips during the daytime hours

8 / 40

Hazardous materials (that are not forbidden) carried on a bus must be:

Labeled

Stored in the passenger compartment

All of these answers are correct

Carried in a metal box

9 / 40

Cargo tanks ____.

are tanks that the military uses to transport hazardous materials

are bulk packagings permanently attached to a vehicle

are large drums used to contain hazmat that is loaded on a trailer

are large drums temporarily attached to a vehicle

10 / 40

____is what can legally hold the parking brake or emergency brake in position for a bus, truck, or truck tractor.

Spring pressure

Brake pressure

Air pressure

All of these answers are correct

11 / 40

How do you know when your brakes are fading?

to control your speed on a downgrade you have to push harder on the brake pedal

to control your speed on a downgrade you have to apply less pressure to the break pedal

the brake pedal flops to the cabin floor

your speed increases when pressure is removed from the brake pedal

12 / 40

A placard is required for a combustible liquid at?

100 gallons

110 gallons

Any amount

1,001 pounds or more

13 / 40

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

none of the answers listed

close the shut off valves at the back of each 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

14 / 40

If your bus has an emergency exit door, it must:

All of these answers are correct.

Be closed when operating the bus.

Not have any signs, stickers, or markings anywhere near it.

Have a red electric door light turned on at all times.

15 / 40

While completing the 3rd component of the air brake check of a combination vehicle, at what psi should the tracor protection valve and parking brake valve should pop out?

They should never pop out

70 psi

20 psi

40 psi

16 / 40

There should be ___space between the upper and lower fifth wheel after coupling.

1/8 inch

1/30 inch

none of the answers listed

1/12 inch

17 / 40

The trailer height is correct for connecting a converter dolly to a second trailer when:

the trailer will slightly rise when the converter dolly is backed under it

the trailer will slightly lower when the converter dolly backed under it

the top of the kingpin lines up with the locking jaws

the kingpin is resting behind the fifth wheel

18 / 40

Tankers used to transport hazardous materials on vehicles must be marked with:

The date of manufacture.

The chemtrec phone number.

The owner's puco or icc number.

The un or na id number of the product.

19 / 40

While completing the 2nd component of the air brake check you are required to turn the electrical power on, begin fanning off the air pressure by rapidly relasing and apply the foot brake and _____.

none of the answers listed

the tractor protection valve and parking brake valve should pop out before air pressure falls below 60 psi for combination vehicles

a low air warning device should sound before the air pressure drops below 40 psi

a low air warning device should sound before the air pressure drops below 60 psi

20 / 40

How do you test your service brakes?

release the air pressure and activate the parking brake

after releasing the parking brake, move forward slowly and apply pressure to the brake pedal

apply pressure to the brake pedal when moving at highway speeds

pull over and activate the parking brake

21 / 40

What does the amount of liquid you can carry depend on?

The center of gravity.

The vehicle's horsepower rating.

The outage of the liquid.

The material the baffles are made from.

22 / 40

Select the statement that describes how you could damage the landing gear.

have the trailer kingpin centered over the fifth wheel

have the tractor and trailer aligned

back under the trailer at an angle

back under the trailer in a straight path

23 / 40

The interlock system for the brake and accelerator on a transit coach may be used:

As a safety feature when the exit door is open.

All of these answers are correct.

To replace the parking brake.

To replace the rear door emergency buzzer.

24 / 40

A "transport index" relates to products that are:

Overweight

Radioactive

Liquid

Meant for human consumption

25 / 40

It is important to know the outage required for the liquids you carry because:

Some liquids will expand more than others when warm.

Some of the denser liquids don't need any.

None of these answers are correct.

Tank baffles may not always be permitted with outage.

26 / 40

What position should the tractor protection control valve be in after coupling?

mid position

lowered

raised

normal

27 / 40

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

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

None of these answers are correct.

A bulk container not permanently attached to a vehicle.

A bulk container permanently attached to a vehicle.

28 / 40

You should check your tires every ____ or every ____ when driving in very hot weather.

2 hours, 100 miles

1 hour, 50 miles

3 hours, 200 miles

5 hours, 250 miles

29 / 40

What is the standee line?

A 2 inch line on the floor that all passengers must stay behind.

A line at the back of the bus where passengers must stand before exiting.

A 2 inch line down the aisle to help keep passenger traffic flowing.

A line around each seat to help each passenger have a little personal space.

30 / 40

What action should you take if there is no phone available and you discover your hazardous materials shipment leaking at a rest stop?

Leave your truck parked with emergency lights on and walk for help.

Keep driving for help as quickly as possible.

Send someone for help with all the necessary information.

Keep driving, slowly and cautiously, until you reach a phone.

31 / 40

In Column 1 the symbol "I" means:

International restrictions.

Iodine.

Invalid substance.

International transportation.

32 / 40

Why is it dangerous to unlock the pintle hook with the dolly still under the rear trailer?

the spring brakes may release

the dolly tow bar may fly up

the fifth wheel may be misaligned

the kingpin may snap in half

33 / 40

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

To monitor passenger activity.

To monitor the driver's appearance.

To provide visibility directly in the back of the bus.

To check blind spots.

34 / 40

Make sure____when the front trailer supports are up and the trailer is sitting on the tractor.

both of the answers listed

there is enough space for clearance between the nose of the trailer and the tops of the tractor tires

there is enough space for clearance between the landing gear and the tractor frame

neither of the answers listed

35 / 40

Should the air pressure in the service air tanks fall below____the driver must be alerted via warning mechanism in the truck cab.

30 psi

60 psi

80 psi

50 psi

36 / 40

Select the definition for outage:

It is loss of power to the headlights.

It is how much power is lost to the hydraulics.

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

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

37 / 40

How often should you check your cargo?

after every break you take during driving

every 150 miles or every three hours

all of these answers are correct

within the first 50 miles after beginning a trip

38 / 40

What is a supply pressure gauge used for?

it tells you how much pressure is in the air tanks

it tells you how much slack is in the slack adjusters

all of these answers are correct

it tells you how much pressure is in the air lines

39 / 40

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

Each time you stop.

Once every three hours.

Once every 100 miles.

Start of each day and every time you stop.

40 / 40

Select the true statement in regards to managing the space to the sides:

you should always keep your vehicle to the right side of the lane

you should drive down the center of both lanes over the pavement markings

high wind gusts will not cause any issues for doubles or triples

you should try to avoid driving next to others when possible

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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

CDL Category Practice Tests

CDL Practice Test

How To Get A Missouri Commercial Drivers License

Hit the Open Road

Missouri CDL License Test Tips

Additional Information

Information on the Missouri Department of Revenue

Additional Missouri CDL Helpful Links

Missouri
CDL Practice Test