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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. Hazardous materials placards are:
Signs put on the outside of a vehicle to warn others of hazardous materials.
Signs put on top of a vehicle that identify the hazard class of the cargo.
Signs put on the outside of a vehicle that identify the hazard class and weight of the vehicle.
None of the above.
2. Which of the following statements about staying alert while driving is true?
If you are drowsy, the only safe cure is to stop and take a fresh shower.
Drinking a cup of coffee will do more to keep you alert than a 20 minute nap.
Some drugs can overcome fatigue.
None of the above.
3. You should you NOT sound your horn:
to alert another driver to a potential problem.
to warn a pedestrian who may not have seen you.
to tell other drivers that they made a mistake.
to alert another driver to your presence.
4. When driving a double or triple, you should:
drive with emergency flashers on.
drive in the left lane whenever possible.
increase your following distance.
decrease your following distance.
5. If your truck has automatic transmission, you should downshift:
when going down grades.
whenever road conditions allow.
after entering a curve.
when you need to accelerate.
6. The following are some causes of vehicle fires:
Tight turns and gravel roads
Under-inflated tires and duals that touch
Tailgating while smoking
All of the above.
7. Most hydraulic brake failures occur for one of two reasons, one of which is:
driving in cold weather.
excessive downshifting.
loss of hydraulic pressure.
relying too much on the engine braking effect.
8. For safety during a trip, you should:
drive on the shoulder of the road.
shift into a lower gear.
use your senses to check for problems.
pull off the road and stop.
9. During a pre-trip inspection, when checking the power steering hoses, you should:
look for broken or distorted coil springs.
check for leaks.
check that the brake chambers are not leaking.
check for damaged or bent rims.
10. How should you brake if your vehicle loses ABS?
Step on and off the brake pedal several times
Brake as you always have.
Stay off the Brake
Pump the brake repeatedly
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CO CDL Knowledge Test

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