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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. You should downshift in advance before:
starting down a hill or entering a curve.
crossing a bridge.
entering the highway.
entering a tunnel.
2. When is it safe to remove the radiator cap?
Whenever coolant has to be added to the system.
When you can touch the radiator cap with your bare hand.
As soon as you've stopped, as long as the engine is not hot.
It is always safe.
3. When making a turn you should:
signal early.
turn the signal off before entering the turn.
make gestures to get the attention of other drivers.
honk your horn.
4. The service line is also called:
power line.
cable line.
control line.
brake line.
5. Retarders:
reduce brake wear.
help slow a vehicle.
reduce the need for using your brakes.
All of the above.
6. When the road is slippery, you should:
slightly increase your speed to reach the next stop.
reduce your speed.
release the accelerator and push in the clutch.
apply the brakes, then let the wheels turn freely.
7. Reaction distance is the distance you will continue to travel, in ideal conditions:
from the time your eyes see a hazard until your brain recognizes it.
before the vehicle comes to a complete stop.
before you physically hit the brakes.
All of the above.
8. If the low air pressure warning light comes on, you should:
set the parking brake.
call for help.
stop immediately.
continue to drive normally.
9. B:C type fire extinguishers are suitable for dealing with:
tire fires.
electrical fires and burning liquids.
wood fires.
cloth and paper fires.
10. If you are driving a vehicle with manual transmission that requires double clutching to change gears, the first step of the basic method for shifting up is to:
Push in the clutch and shift into a higher gear at the same time.
Release the clutch and press the accelerator at the same time.
Pump the brakes and release the clutch.
Release the accelerator, push in the clutch and shift to neutral at the same time.
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OR CDL Practice Test

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