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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. When driving at night, you should:
use dark lenses if possible.
look directly at the lights of oncoming vehicles.
put your own high beams on if other drivers don't put their low beams on.
drive slowly enough to see obstacles with your headlights.
2. If you double your speed, your braking distance will be:
2 times longer.
3 times longer.
8 times longer.
4 times longer.
3. If your cargo only fills one-third of the length of your trailer, make sure your cargo is:
piled up high with heavy cargo on top.
to one side and as close to the ground as possible.
centered and spread out as much as possible.
loaded so there is a high center of gravity.
4. When driving on a slippery surface, you should do all of the following except:
watch far enough ahead to keep a steady speed.
adjust braking to conditions.
keep a shorter following distance.
not pass slower vehicles unless necessary.
5. When driving at night, to avoid glare from oncoming vehicles you should:
look directly at lights of oncoming vehicles.
look slightly to the right at a right lane or edge marking.
put your own high beams on when other drivers do not put their low beams on.
wear sunglasses.
6. Regardless of its size, cargo should have at least ___ tie-downs.
7. When using mirrors, you should keep an eye on your tires:
to spot a tire fire.
to check tread depth.
to make sure they are properly inflated.
to see if they are rolling properly.
8. If you are being tailgated, you should:
increase your following distance.
avoid quick changes.
avoid tricks like turning on your taillights or flashing your brake lights.
All of the above.
9. Whenever you are about to pass a pedestrian, bicyclist, or vehicle, you should assume that they:
are hard to see.
will move out of your lane of traffic.
can see you.
could suddenly move in front of you.
10. If driving in a foggy area, you should NOT:
turn on 4-way emergency flashers.
use high beams for best visibility.
use roadside highway reflectors as guides.
slow down before you enter fog.
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OR CDL Knowledge Test

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