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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. Which of the following is a clue to a drunk driver?
Waiting too long at a stop
Driving with the flow of traffic
Not changing lanes
Driving at a constant speed
2. Mirror adjustment should be checked:
prior to the start of any trip.
once a week.
once a month.
only if you plan on using them.
3. Empty trucks:
require a greater stopping distance than full trucks.
require a shorter stopping distance than full trucks.
require the same stopping distance than full trucks.
None of the above.
4. Vehicles must be equipped with emergency equipment, including:
automatic transmission fluid
warning devices for parked vehicles
circuit breakers
first-aid kit
5. Air pressure should build up in a single air system, within about:
3 minutes.
1 minute.
10 minutes.
15 minutes.
6. If you cannot see well enough while driving in cold weather, you should:
stop safely and fix the problem.
keep driving and check that the wiper blades press against the window hard enough to wipe the windshield clean.
reduce your speed and make sure the windshield washer works.
turn your defroster on and slow down until you can see again.
7. The service brake system:
applies and releases the emergency brake.
applies and releases the parking brakes.
applies and releases the brakes when you use the brake pedal during normal driving.
None of the above.
8. When a tire fails, the driver should:
stay off the brake.
swerve to the right.
drive on the shoulder.
immediately apply the brakes.
9. To test the service brake:
push the brake pedal firmly while slowly moving backward.
shift your transmission to a low gear, pump the brake pedal three times, then hold it down for five seconds.
gently try to pull forward with the trailer parking brake on, then release the brake.
push the brake pedal firmly while going about 5 mph.
10. Commercial motor vehicles:
are not required to have a fire extinguisher if they already have reflective warning triangles and other emergency equipment.
are only required to have a fire extinguisher when transporting hazardous materials.
should have a properly charged and rated fire extinguisher and other emergency equipment.
None of the above.
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CO CDL Knowledge Test

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