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The CDL general knowledge test is required to be taken by all CDL applicants. The Colorado CDL test consists of 50 questions. To pass, you must correctly answer at least 40 questions (80%). The general knowledge test covers the contents of the Colorado CDL Manual. All CDL applicants (Class A, B and C) must study the following sections: Driving Safely, Transporting Cargo Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Vehicle Inspection Test, Basic Control Skills Test, Road Test. In addition, the Class A CDL test will include questions based on the Combination Vehicles section. Take this CDL practice test now to prepare for the actual CO general knowledge test! To get your CDL, you must pass both the knowledge and skills tests. CDL knowledge tests include: General Knowledge, Passenger Transport, Air Brakes, Combination Vehicles, Hazardous Materials, Tanker Vehicles, Doubles/Triples, School Bus, Firefighter. Depending on what class of license (A, B or C) and endorsements you need, you must take one or more knowledge tests. A special endorsement is also required to drive certain types of vehicles. The following endorsements may be used with a Class A, B or C CDL: HazMat (H), Tank Vehicles (N), Tank Vehicles Transporting Hazardous Materials (X) and Passenger Transport (P). The School Bus endorsement (S) is only available for Class A or B CDL, and the Doubles/Triples endorsement (T) is only available for Class A driver's licenses.
1. Combination vehicles usually require _________ single commercial vehicles.
less driving skill than
more driving skill than
the same level of skill as
None of the above.
2. Emergency equipment is:
only required when transporting hazardous materials.
3. Which of the following is not proper tie-down equipment:
Bungee cords
4. Drivers operating CMVs must notify their employer within ______ of a conviction for any traffic violation (except parking).
3 days
30 days
14 days
7 days
5. If your vehicle thumps or vibrates heavily, it may be a sign that:
the engine belt is loose.
the brakes have failed.
one of the tires has gone flat.
you need to shift up.
6. Which of these should you check before driving in winter?
Windshield wiper blades
Coolant level and antifreeze amount
All of the above.
7. When driving, you should check mirrors regularly to know where other vehicles are around you. Remember that:
you should check your after the start of any trip to make sure they are properly adjusted.
every registered motor vehicle must have at least one mirror.
convex mirrors make things look larger and closer than they really are.
there are blind spots that your mirrors cannot show you.
8. Air storage tanks:
are installed in the first tank the air compressor pumps air to.
hold compressed air for the brakes.
pump air into the air storage tanks.
use parts of the service brake systems to stop the vehicle in a brake system failure.
9. Before transporting a sealed load, make sure:
that there is a picture of its contents.
that the load can be inspected.
that you don't exceed gross weight and axle weight limits.
All of the above.
10. Name 2 causes of tire fires.
Under-inflated tires and duals that touch.
Loose connections and poor ventilation.
Driver smoking and bleeding tar.
Over-inflated tires and duals that touch.
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CO CDL Practice Test

Number of questions: 50
Correct answers to pass:40
Passing score:80%
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