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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. Cargo should be properly covered:
to protect the weather from the cargo.
to protect people from spilled cargo.
to block your view or someone else’s.
All of the above.
2. The distance your vehicle travels, in ideal conditions, from the time you see a hazard until your brain recognizes it, is called:
Reaction distance
Stopping distance
Braking distance
Perception distance
3. At dawn, dusk, in rain or snow, to make yourself easier to see you should:
use the low beams.
use the parking lights.
use the high beams.
use the emergency flashers.
4. If your vehicle gets stuck on the railroad tracks, you should:
check for identifiable landmarks to give the location of the crossing.
get out of your vehicle and away from the tracks.
gather up your paperwork and shipping papers while calling 911, then get out of the vehicle.
All of the above.
5. To make sure you always have overhead clearance, you must be aware that ________ may have reduced the clearances since the heights were posted.
water on the road
the weight of the cargo
packed snow
warm temperatures
6. To keep your vehicle from rolling back when you start, you should:
pump the brakes.
apply the emergency brake whenever necessary.
partly engage the clutch before you take your foot off the brake.
turn the engine off before you take your foot off the brake.
7. Drivers should try to park their vehicle so that:
they can do a walk around inspection.
the vehicle is protected by trees.
they can pull forward when they leave.
there is at least one curb next to the vehicle.
8. Drivers should adjust their mirrors:
while driving.
after driving.
before driving.
None of the above.
9. Which of the following statements about backing heavy vehicles is true?
You should avoid backing whenever you can.
Back to the right side so that you can see better.
The helper should stand where you cannot see the helper.
Always back as quickly as possible.
10. If you become drowsy while driving, you should:
take a break.
drink plenty of coffee.
open the windows to get some fresh air.
try to fight it.
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OR CDL Knowledge Test

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