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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. To test your hydraulic brakes for leaks:
apply firm pressure to the brakes for five seconds, then pump them three times.
turn off the engine and and listen for leaks.
pump the brake pedal three times, then hold it down for five seconds.
None of the above.
2. Brakes out of adjustment can cause the other brakes to:
overheat and fade.
work better.
last longer.
apply more braking power.
3. When you get in the vehicle and start the engine, you should:
put the gearshift in neutral (or park if automatic) before starting the engine.
make sure the parking brake is on before starting the engine.
listen for unusual noises after starting the engine.
All of the above.
4. If a tire fails while you are driving, you should:
call your supervisor for instructions.
stay off the brake until your vehicle has slowed down.
stop on the roadway if possible.
brake as hard as possible.
5. Which of the following is NOT a type of retarder?
6. To prevent rolling back when you start, if you have a manual transmission you should:
partly engage the clutch before you take your right foot off the brake.
use the lowest reverse gear.
never the parking brake.
7. Which of these statements is correct?
Others could be hurt or killed by cargo that falls off a vehicle.
Loose cargo that falls off a vehicle can cause traffic problems.
Loose cargo can hurt the driver during a quick stop.
All of the above.
8. If you feel drowsy while driving, you should:
get some coffee.
pull off the road and get some rest.
fall asleep.
stop yawning.
9. When starting your vehicle, oil pressure should come up to normal:
within 5 minutes of driving.
in about a minute.
within seconds.
in about two minutes.
10. An anti-lock braking system (ABS):
helps you avoid wheel lock up.
should help you steer around an obstacle while braking.
helps you avoid skids caused by over braking.
All of the above.
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OR CDL Practice Test

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