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The CDL general knowledge test is required to be taken by all CDL applicants. The Oregon 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 Oregon 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 OR 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. Most hydraulic brake failures occur for one of two reasons, one of which is:
relying too much on the engine braking effect.
loss of hydraulic pressure.
driving in cold weather.
excessive downshifting.
2. To use road speed to know when to switch gears you should:
learn what speeds each gear is good for.
use the posted speed limit as a guide.
learn the operating rpm range of your vehicle.
watch your tachometer, and shift up when your engine reaches the top of the range.
3. During the vehicle inspection, when checking the tires you should:
ensure that the tread is evenly worn.
ensure the middle of the tires is more worn than the outside.
check for the minimum tread depth (4/32 on all tires).
ensure that valve caps are missing.
4. To back-up safely, you should:
start in the proper position.
use mirrors on both sides.
look at your path.
All of the above.
5. Placards are:
used to warn others when the Gross Vehicle Weight (GVW) exceeds 10,000 pounds.
signs put on the outside of a vehicle that identify the hazard class of the cargo.
signs that warn others to stay at least 500 feet away from the vehicle.
signs put on the inside of a vehicle that remind the driver of the type of cargo he or she is carrying.
6. A tank endorsement is:
not required when transporting hazardous materials.
only required when transporting liquids.
required for both liquids and gases.
only required when transporting gases.
7. Obstacles on the roadway that appear to the harmless:
never contain material capable of causing damage.
should be driven over.
can be dangerous.
None of the above.
8. Name two causes of tire fires.
Driver smoking and poor ventilation.
Under-inflated tires and dual tires that touch
Mismatched tires and road debris.
Excessive braking
9. Poor weight balance:
increases fuel efficiency.
improves handling.
can make vehicle handling more difficult.
makes it easier to turn.
10. Which of the following is NOT true?
ABS won't compensate for bad brakes.
ABS won't compensate for poor brake maintenance.
ABS will change the way you normally brake.
ABS only comes into play when a wheel would have locked up because of over braking.
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OR CDL Knowledge Test

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