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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. Drivers should watch out for black ice when the temperature is ______ freezing and the road looks ______.
below; dry
below; wet
above; dry
above; wet
2. When approaching and driving through a work zone, you should:
use your 4-way emergency flashers or brake lights to warn drivers behind you.
observe the posted speed limits.
slow down.
All of the above.
3. You should be especially alert for drunk drivers:
in the morning.
around shopping areas.
in the early evening.
late at night.
4. Empty trucks require greater stopping distances. True or False?
True, but only on wet surfaces.
False, but only for trucks built on or after March 1, 1998.
5. Anti-lock brakes:
reduce the perception distance.
increase your stopping distance.
help you stop faster.
keep your brakes from locking up when you brake hard.
6. CMV drivers who are convicted of a second DUI offense will lose their CDL driving privileges for:
at least 1 year.
at least 5 years.
at least 3 years.
7. To correct a drive-wheel braking skid, you should:
stop braking and countersteer.
release the clutch and press the accelerator at the same time, then countersteer.
fully apply the brakes until you stop.
steer into the skid.
8. Which of the following statements about tire failure is true?
If the steering feels heavy, it may be a sign one of the rear tires has failed.
It can take a few seconds for your vehicle to react, and you might think it was some other vehicle.
Any time you hear a tire blow, you would be safest to assume it is not yours.
All of the above.
9. In coming down steep downgrades, you should:
select an appropriate speed.
go slowly enough so your brakes don't get too hot.
use a low gear.
All of the above.
10. The air storage tanks:
are used to hold compressed air.
protects the tank and the rest of the system from too much pressure.
stop the compressor from pumping air.
are connected to the engine through gears or a v-belt.
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CO CDL Practice Test

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