colorado
CDL Practice Test

Welcome to the Colorado CDL practice test site. Topics covered in these practice tests are designed to prepare you for the Colorado Department of Motor Vehicles CDL test. These tests are free and you are able to take tests as many times as you would like as you prepare to obtain your Colorado CDL. 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 are driving a 40 foot truck at 35 MPH, how much space (in seconds) should you keep in front of you?

4 seconds

5 seconds

6 seconds

3 seconds

2 / 40

The brake pushrod should not move more than____for manual slack adjusters.

checking is not required in vehicles built after 1994 as they have automatic slack adjusters

movement is not allowed

1-2 inches while the brakes are set

an inch when pulled by hand with the brakes released

3 / 40

Students exit the bus and walk:

Across the street.

The distance it takes to clear the danger zone.

At least 10 feet away from the side of the bus.

At least 8 feet away from the side of the bus.

4 / 40

How do you check the connection after locking the kingpin into the fifth wheel?

pull forward 25 feet, turn to the left, and then to the right

pull the tractor at a sharp right to release the trailer brakes

pull the tractor ahead gently with the trailer brakes locked down

pull forward 25 feet, turn to the right, and then to the left

5 / 40

Which two special conditions indicate that you should downshift?

starting down a hill and entering a curve

starting up a hill and entering a curve

starting up a hill and finishing a curve

starting down a hill and finishing a curve

6 / 40

Select the statement that tells you how you can check the low pressure warning signal.

The low pressure warning signal is only testable by the factory.

Turn the electrical power on and apply pressure on and off the brake pedal to decrease the air tank pressure. The low air pressure warning signal must come on before the pressure drops to less than 60 psi in the air tank.

Turn the electrical power on and apply pressure on and off the brake pedal to increase air tank pressure. The low air pressure warning signal must come on before the pressure increases to more than 60 psi in the air tank.

Turn the electrical power off and apply pressure on and off the brake pedal to decrease air tank pressure. The low air pressure warning signal must come on before the pressure drops to less than 30 psi in the air tank.

7 / 40

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

the kingpin may snap in half

the fifth wheel may be misaligned

the dolly tow bar may fly up

the spring brakes may release

8 / 40

Select the true statement in regards to the center of gravity for tanks:

The vehicle can turn over even when driving at the posted speed limit for curves.

None of the answers listed.

The center of gravity is generally lower than with other large trucks.

The vehicle can handle higher speeds around curves than other large trucks.

9 / 40

Which of the following is a necessary qualification for non-bulk packaging?

Maximum net mass of 400 kg, or less than 450 l if used as a receptacle for a solid.

All of these answers are necessary qualifications.

A maximum capacity of 450 l or less if it is used as a receptacle for liquids.

Maximum water capacity of 454 kg or less if used as a receptacle for gases.

10 / 40

Select the correct description for a bulkhead tank.

It is one large tank.

None of the answers listed.

They are divided down into smaller tanks.

They are divided with holes to allow liquid to flow through controlling surge.

11 / 40

When is it acceptable for non-hazardous materials to be described by hazard class words or identification numbers?

Always

During an emergency

For hazards not described in the hazmat manual

Never

12 / 40

The best way to go into a curve is to decrease your speed going into the curve and then ____going through it.

ride the brake

none of the answers listed

shift down 2 gears

slightly accelerate

13 / 40

To be sure that air is supplied to the second trailer:

while driving at 10 mph, use the hand valve. The vehicle should stop in the same distance of a single trailer moving at 5 mph

keep an eye of the air gauge for a drop of 30 psi

crank the engine brake

open the emergency line shut off at the back of the second trailer

14 / 40

What do you do first during step 3 of starting the engine and inspecting the inside of the cab?

Make sure the parking brake is activated after getting in the cab.

Start the engine after getting in the cab.

Shift the gear to neutral.

Listen for any unsual noises after starting the engine.

15 / 40

The driver's manual advises you to disconnect the steering axle brake to keep the rig straight:

when it is raining

whever you feel like it

in ideal conditions

never

16 / 40

Select the factor that has no effect on how much liquid you can carry:

How much the liquid will expand in transport.

The density of the liquid.

The legal amount of weight you can carry of any particular liquid.

The liquid's weight.

17 / 40

You are required to have a tank endorsement when transporting:

Passengers

Bulk fertilizer

Materials that are hazardous

Gas or liquid

18 / 40

When should you avoid using the parking brake?

while on an incline

whenever you park

when the air pressure is low

when the brakes are hot

19 / 40

Play of the steering wheel should not exceed:

30 degrees

15 degrees

10 degrees

5 degrees

20 / 40

The best way to test the low air pressure warning signal is to:

apply pressure on and off the brakes while the engine is running

apply pressure on and off the brake pedal until the air pressure drops below 20 psi

apply pressure on and off the brake pedal with the engine off to drop the air pressure to below 60 psi

manually release the air out of your brakes to see if the signal activates

21 / 40

Which of the following hazard classes utilizes a transport index in order to determine how much of it can be loaded on a single vehicle for transport?

Class 3—flammable liquids

Class 1—explosives

Class 4—live chickens

Class 7—radioactive materials

22 / 40

Which of the following is a clue another driver is impaired:

Exiting the interstate when there's no gas station visible.

All of these answers are correct.

Stopping at a green light, or waiting too long at a stop.

Open window in warm weather.

23 / 40

Select when you should use the hand valve to park a combination vehicle.

never

when parking at a loading dock

when parking on a downgrade

when parking in a commercial lot

24 / 40

Commerical vehicles typically have this type of brake.

drum brakes

rectangle brakes

S-Cam brakes

stab brakes

25 / 40

Select the true statement in regards to crossing your air lines on a new trailer with spring brakes

you will be unable to release the tractor brakes

there is no way to know if there is an issue

you will have brakes that are not operational

you will be unable to realse the trailer brakes

26 / 40

What is the service air line controlled by?

the pressure applied to the trailer hand brake or by the foot brake

the relay valve that connects the trailer air tanks to the trailer air brakes

all answers listed

the relay vavle by sending air pressure from the trailer air tank to the trailer brake chambers

27 / 40

How far before a railroad crossing should you stop your bus?

10 to 35 feet

50 to 75 feet

15 to 50 feet

100 feet exactly

28 / 40

For what reason do you keep the starter switch key in your pocket during the pre-trip inspection?

you will need it to open the side box

so you don't lose it

you will need it to inspect the trailer

so no one moves the vehicle while you are inspecting underneath it

29 / 40

Which of the following statements about downshifting is NOT true?

downshift before climbing a hill

downshift before entering a curve

downshift when you get to the bottom of a hill

downshift before starting down a hill

30 / 40

Which of the following will confirm that you are driving with anti-lock brakes?

Red indicator lamp on the brake cylinder.

The certification on the driver side door.

Yellow abs malfunction lamp on the instrument panel will light when you start the engine.

The bus operators manual.

31 / 40

What should you check for when inspecting a converter dolly?

all answers listed

that the safety chains are secured to the trailer

that the spare tire is secured if there is one

that the converter dolly air tank drain valve is in the closed position

32 / 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)

excessive heat from extensive use

when using the engine brake more than the brakes

brakes that are not aligned properly

tire retread that is mismatched

33 / 40

Which is more likely to tip over due to the crack the whip effect?

the last trailer of a double

a fully loaded trailer behind the tractor

any trailer

the last trailer of a triple

34 / 40

What does the air compressor governor control?

when air is pumped into the air tanks

when the valve system releases pressure

when the air is taken out of the hoses

when air pressure is applied to the brakes

35 / 40

Which of the following is a recommended procedure when unloading the students?

Position yourself outside of the bus in front of crossover mirror to supervise unloading.

Put the transmission in neutral gear and put on the brakes.

Tell students to remain seated until they are told to exit.

Let the students begin moving to the front of the bus before it's fully stopped to maximize efficiency.

36 / 40

After deciding the type of evacuation that is necessary, the next step you must take is:

Securing the bus.

Notifying the dispatch office of the evacuation.

Opening the emergency exits.

Dangle the radio microphone out of the driver window for later use.

37 / 40

To test the security of the tractor semi trailer connection you should:

you don't need to check it

look at it carefully after pulling forward gently in a low gear against the locked trailer brakes

with the trailer brakes locked, rock the trailer back and forth

put the tractor in a high gear and quickly pull ahead

38 / 40

Select the true statement in regards to the braking power of spring brakes.

the braking prower increases when the brakes are hot

braking power can only be tested by licensed mechanics

it depends on the adjustment of the service brakes

it will not be affect by the condition of the service brakes

39 / 40

Select the inappropriate way to test for the low pressure warning signal.

have the electrical power on

ask for a pedestrian to listen for the signal

decreased the air pressure by stepping on and off the brake pedal

turn off the engine

40 / 40

Liquid surge affects the handling of a tanker by:

Decreasing the wind drag.

Allowing you to take tighter turns.

Moving the truck in the direction of liquid flow.

Allowing you to stop faster.

Your score is

The average score is 0%

5/5 - (1 vote)

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CDL Practice Test

How To Get A colorado Commercial Drivers License

Colorado residents the age of 18 or older can apply for their commercial driver’s license. Those between the ages of 18 and 21 are restricted to intrastate driving. Individuals must be 21 years or older to receive their Hazmat, School Bus, or Doubles/Triples Endorsements. All applicants must possess a DOT medical card issued by a FMCSA certified medical examiner in order to be eligible for their CDL.

Any applicants that fall under the following conditions are automatically disqualified from receiving a CDL.

Having more than one driver’s license.
Being disqualified for commercial driving privileges in another state.
Being convicted in the past two years of driving a commercial vehicle impaired.
Having a suspended, canceled, denied, or revoked driver’s license.

All Colorado residents who are seeking to get their commercial driver’s license must pass both one or more knowledge tests as well as a practical skills test.

Endorsements
T – Double And Triple Trailers
N – Tanker Vehicles
P – Passenger
S – School Bus
H – Hazardous Materials
X – Tanker With Hazmat

Hit the Open Road

colorado CDL License Test Tips

All applicants are required to take one or more knowledge tests to display their comprehension of the commercial driving law. Class A, B, and C applicants must complete a 50 question assessment. Class A applicants are responsible for completing an additional 20 questions all based on the subject of combination driving. Applicants seeking endorsements will be required to complete a knowledge test specific to the endorsement sought. The endorsement tests range between 20 and 30 questions. All applicants must receive a score of 80 percent or higher to pass a knowledge test.Applicants for a Colorado CDL must complete a skills test is order to receive their CDL. The skills assessment is comprised of an on-road test, vehicle inspection, and basic controls skills test. Applicants who are applying for endorsements are required to complete the skills test with the type of vehicle the endorsement is intended for.

Additional Information

Information on the Colorado Division of Motor Vehicles

The State of Colorado Department of Revenue Division of Motor Vehicles regulates the CDL requirements and testing in Colorado. To get more information contact them via:

Website: https://www.colorado.gov/pacific/dmv/im-commercial-driver

Phone: 303.205.5600

Additional Colorado CDL Helpful Links

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

colorado CDL Practice Test